content/browser/gpu/gpu_process_host.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/gpu/gpu_process_host.h"
   6
   7 #include "base/base64.h"
   8 #include "base/base_switches.h"
   9 #include "base/basictypes.h"
  10 #include "base/bind.h"
  11 #include "base/callback_helpers.h"
  12 #include "base/command_line.h"
  13 #include "base/logging.h"
  14 #include "base/memory/ref_counted.h"
  15 #include "base/metrics/histogram.h"
  16 #include "base/sha1.h"
  17 #include "base/threading/thread.h"
  18 #include "base/trace_event/trace_event.h"
  19 #include "content/browser/browser_child_process_host_impl.h"
  20 #include "content/browser/gpu/compositor_util.h"
  21 #include "content/browser/gpu/gpu_data_manager_impl.h"
  22 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
  23 #include "content/browser/gpu/shader_disk_cache.h"
  24 #include "content/browser/renderer_host/render_widget_host_impl.h"
  25 #include "content/browser/renderer_host/render_widget_resize_helper.h"
  26 #include "content/common/child_process_host_impl.h"
  27 #include "content/common/gpu/gpu_messages.h"
  28 #include "content/common/in_process_child_thread_params.h"
  29 #include "content/common/view_messages.h"
  30 #include "content/public/browser/browser_thread.h"
  31 #include "content/public/browser/content_browser_client.h"
  32 #include "content/public/browser/render_process_host.h"
  33 #include "content/public/browser/render_widget_host_view.h"
  34 #include "content/public/browser/render_widget_host_view_frame_subscriber.h"
  35 #include "content/public/common/content_client.h"
  36 #include "content/public/common/content_switches.h"
  37 #include "content/public/common/result_codes.h"
  38 #include "content/public/common/sandbox_type.h"
  39 #include "content/public/common/sandboxed_process_launcher_delegate.h"
  40 #include "gpu/command_buffer/service/gpu_switches.h"
  41 #include "ipc/ipc_channel_handle.h"
  42 #include "ipc/ipc_switches.h"
  43 #include "ipc/message_filter.h"
  44 #include "media/base/media_switches.h"
  45 #include "ui/base/ui_base_switches.h"
  46 #include "ui/events/latency_info.h"
  47 #include "ui/gl/gl_switches.h"
  48
  49 #if defined(OS_ANDROID)
  50 #include "base/android/build_info.h"
  51 #endif
  52
  53 #if defined(OS_WIN)
  54 #include "base/win/windows_version.h"
  55 #include "content/common/sandbox_win.h"
  56 #include "sandbox/win/src/sandbox_policy.h"
  57 #include "ui/gfx/switches.h"
  58 #endif
  59
  60 #if defined(USE_OZONE)
  61 #include "ui/ozone/public/ozone_switches.h"
  62 #endif
  63
  64 #if defined(USE_X11) && !defined(OS_CHROMEOS)
  65 #include "ui/gfx/x/x11_switches.h"
  66 #endif
  67
  68 #if defined(OS_MACOSX) && !defined(OS_IOS)
  69 #include "content/browser/browser_io_surface_manager_mac.h"
  70 #include "content/common/child_process_messages.h"
  71 #endif
  72
  73 namespace content {
  74
  75 bool GpuProcessHost::gpu_enabled_ = true;
  76 bool GpuProcessHost::hardware_gpu_enabled_ = true;
  77 int GpuProcessHost::gpu_crash_count_ = 0;
  78 int GpuProcessHost::gpu_recent_crash_count_ = 0;
  79 bool GpuProcessHost::crashed_before_ = false;
  80 int GpuProcessHost::swiftshader_crash_count_ = 0;
  81
  82 namespace {
  83
  84 // Command-line switches to propagate to the GPU process.
  85 static const char* const kSwitchNames[] = {
  86   switches::kDisableAcceleratedVideoDecode,
  87   switches::kDisableBreakpad,
  88   switches::kDisableGpuSandbox,
  89   switches::kDisableGpuWatchdog,
  90   switches::kDisableGLExtensions,
  91   switches::kDisableLogging,
  92   switches::kDisableSeccompFilterSandbox,
  93 #if defined(ENABLE_WEBRTC)
  94   switches::kDisableWebRtcHWEncoding,
  95 #endif
  96 #if defined(OS_WIN)
  97   switches::kEnableAcceleratedVpxDecode,
  98 #endif
  99   switches::kEnableLogging,
 100   switches::kEnableShareGroupAsyncTextureUpload,
 101 #if defined(OS_CHROMEOS)
 102   switches::kDisableVaapiAcceleratedVideoEncode,
 103 #endif
 104   switches::kGpuStartupDialog,
 105   switches::kGpuSandboxAllowSysVShm,
 106   switches::kGpuSandboxFailuresFatal,
 107   switches::kGpuSandboxStartEarly,
 108   switches::kLoggingLevel,
 109   switches::kEnableLowEndDeviceMode,
 110   switches::kDisableLowEndDeviceMode,
 111   switches::kNoSandbox,
 112   switches::kProfilerTiming,
 113   switches::kTestGLLib,
 114   switches::kTraceStartup,
 115   switches::kTraceToConsole,
 116   switches::kV,
 117   switches::kVModule,
 118 #if defined(OS_MACOSX)
 119   switches::kDisableRemoteCoreAnimation,
 120   switches::kDisableNSCGLSurfaceApi,
 121   switches::kForceNSCGLSurfaceApi,
 122   switches::kEnableSandboxLogging,
 123 #endif
 124 #if defined(USE_AURA)
 125   switches::kUIPrioritizeInGpuProcess,
 126 #endif
 127 #if defined(USE_OZONE)
 128   switches::kOzonePlatform,
 129   switches::kOzoneUseSurfaceless,
 130 #endif
 131 #if defined(USE_X11) && !defined(OS_CHROMEOS)
 132   switches::kX11Display,
 133 #endif
 134 };
 135
 136 enum GPUProcessLifetimeEvent {
 137   LAUNCHED,
 138   DIED_FIRST_TIME,
 139   DIED_SECOND_TIME,
 140   DIED_THIRD_TIME,
 141   DIED_FOURTH_TIME,
 142   GPU_PROCESS_LIFETIME_EVENT_MAX = 100
 143 };
 144
 145 // Indexed by GpuProcessKind. There is one of each kind maximum. This array may
 146 // only be accessed from the IO thread.
 147 GpuProcessHost* g_gpu_process_hosts[GpuProcessHost::GPU_PROCESS_KIND_COUNT];
 148
 149
 150 void SendGpuProcessMessage(GpuProcessHost::GpuProcessKind kind,
 151                            CauseForGpuLaunch cause,
 152                            IPC::Message* message) {
 153   GpuProcessHost* host = GpuProcessHost::Get(kind, cause);
 154   if (host) {
 155     host->Send(message);
 156   } else {
 157     delete message;
 158   }
 159 }
 160
 161 // NOTE: changes to this class need to be reviewed by the security team.
 162 class GpuSandboxedProcessLauncherDelegate
 163     : public SandboxedProcessLauncherDelegate {
 164  public:
 165   GpuSandboxedProcessLauncherDelegate(base::CommandLine* cmd_line,
 166                                       ChildProcessHost* host)
 167 #if defined(OS_WIN)
 168       : cmd_line_(cmd_line) {}
 169 #elif defined(OS_POSIX)
 170       : ipc_fd_(host->TakeClientFileDescriptor()) {}
 171 #endif
 172
 173   ~GpuSandboxedProcessLauncherDelegate() override {}
 174
 175 #if defined(OS_WIN)
 176   bool ShouldSandbox() override {
 177     bool sandbox = !cmd_line_->HasSwitch(switches::kDisableGpuSandbox);
 178     if(! sandbox) {
 179       DVLOG(1) << "GPU sandbox is disabled";
 180     }
 181     return sandbox;
 182   }
 183
 184   void PreSandbox(bool* disable_default_policy,
 185                   base::FilePath* exposed_dir) override {
 186     *disable_default_policy = true;
 187   }
 188
 189   // For the GPU process we gotten as far as USER_LIMITED. The next level
 190   // which is USER_RESTRICTED breaks both the DirectX backend and the OpenGL
 191   // backend. Note that the GPU process is connected to the interactive
 192   // desktop.
 193   void PreSpawnTarget(sandbox::TargetPolicy* policy, bool* success) override {
 194     if (base::win::GetVersion() > base::win::VERSION_XP) {
 195       if (cmd_line_->GetSwitchValueASCII(switches::kUseGL) ==
 196           gfx::kGLImplementationDesktopName) {
 197         // Open GL path.
 198         policy->SetTokenLevel(sandbox::USER_RESTRICTED_SAME_ACCESS,
 199                               sandbox::USER_LIMITED);
 200         SetJobLevel(*cmd_line_, sandbox::JOB_UNPROTECTED, 0, policy);
 201         policy->SetDelayedIntegrityLevel(sandbox::INTEGRITY_LEVEL_LOW);
 202       } else {
 203         policy->SetTokenLevel(sandbox::USER_RESTRICTED_SAME_ACCESS,
 204                               sandbox::USER_LIMITED);
 205
 206         // UI restrictions break when we access Windows from outside our job.
 207         // However, we don't want a proxy window in this process because it can
 208         // introduce deadlocks where the renderer blocks on the gpu, which in
 209         // turn blocks on the browser UI thread. So, instead we forgo a window
 210         // message pump entirely and just add job restrictions to prevent child
 211         // processes.
 212         SetJobLevel(*cmd_line_,
 213                     sandbox::JOB_LIMITED_USER,
 214                     JOB_OBJECT_UILIMIT_SYSTEMPARAMETERS |
 215                     JOB_OBJECT_UILIMIT_DESKTOP |
 216                     JOB_OBJECT_UILIMIT_EXITWINDOWS |
 217                     JOB_OBJECT_UILIMIT_DISPLAYSETTINGS,
 218                     policy);
 219
 220         policy->SetIntegrityLevel(sandbox::INTEGRITY_LEVEL_LOW);
 221       }
 222     } else {
 223       SetJobLevel(*cmd_line_, sandbox::JOB_UNPROTECTED, 0, policy);
 224       policy->SetTokenLevel(sandbox::USER_UNPROTECTED,
 225                             sandbox::USER_LIMITED);
 226     }
 227
 228     // Allow the server side of GPU sockets, which are pipes that have
 229     // the "chrome.gpu" namespace and an arbitrary suffix.
 230     sandbox::ResultCode result = policy->AddRule(
 231         sandbox::TargetPolicy::SUBSYS_NAMED_PIPES,
 232         sandbox::TargetPolicy::NAMEDPIPES_ALLOW_ANY,
 233         L"\\\\.\\pipe\\chrome.gpu.*");
 234     if (result != sandbox::SBOX_ALL_OK) {
 235       *success = false;
 236       return;
 237     }
 238
 239     // Block this DLL even if it is not loaded by the browser process.
 240     policy->AddDllToUnload(L"cmsetac.dll");
 241
 242 #ifdef USE_AURA
 243     // GPU also needs to add sections to the browser for aura
 244     // TODO(jschuh): refactor the GPU channel to remove this. crbug.com/128786
 245     result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_HANDLES,
 246                              sandbox::TargetPolicy::HANDLES_DUP_BROKER,
 247                              L"Section");
 248     if (result != sandbox::SBOX_ALL_OK) {
 249       *success = false;
 250       return;
 251     }
 252 #endif
 253
 254     if (cmd_line_->HasSwitch(switches::kEnableLogging)) {
 255       base::string16 log_file_path = logging::GetLogFileFullPath();
 256       if (!log_file_path.empty()) {
 257         result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_FILES,
 258                                  sandbox::TargetPolicy::FILES_ALLOW_ANY,
 259                                  log_file_path.c_str());
 260         if (result != sandbox::SBOX_ALL_OK) {
 261           *success = false;
 262           return;
 263         }
 264       }
 265     }
 266   }
 267 #elif defined(OS_POSIX)
 268
 269   base::ScopedFD TakeIpcFd() override { return ipc_fd_.Pass(); }
 270 #endif  // OS_WIN
 271
 272   SandboxType GetSandboxType() override {
 273     return SANDBOX_TYPE_GPU;
 274   }
 275
 276  private:
 277 #if defined(OS_WIN)
 278   base::CommandLine* cmd_line_;
 279 #elif defined(OS_POSIX)
 280   base::ScopedFD ipc_fd_;
 281 #endif  // OS_WIN
 282 };
 283
 284 }  // anonymous namespace
 285
 286 // static
 287 bool GpuProcessHost::ValidateHost(GpuProcessHost* host) {
 288   // The Gpu process is invalid if it's not using SwiftShader, the card is
 289   // blacklisted, and we can kill it and start over.
 290   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 291           switches::kSingleProcess) ||
 292       base::CommandLine::ForCurrentProcess()->HasSwitch(
 293           switches::kInProcessGPU) ||
 294       (host->valid_ &&
 295        (host->swiftshader_rendering_ ||
 296         !GpuDataManagerImpl::GetInstance()->ShouldUseSwiftShader()))) {
 297     return true;
 298   }
 299
 300   host->ForceShutdown();
 301   return false;
 302 }
 303
 304 // static
 305 GpuProcessHost* GpuProcessHost::Get(GpuProcessKind kind,
 306                                     CauseForGpuLaunch cause) {
 307   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 308
 309   // Don't grant further access to GPU if it is not allowed.
 310   GpuDataManagerImpl* gpu_data_manager = GpuDataManagerImpl::GetInstance();
 311   DCHECK(gpu_data_manager);
 312   if (!gpu_data_manager->GpuAccessAllowed(NULL))
 313     return NULL;
 314
 315   if (g_gpu_process_hosts[kind] && ValidateHost(g_gpu_process_hosts[kind]))
 316     return g_gpu_process_hosts[kind];
 317
 318   if (cause == CAUSE_FOR_GPU_LAUNCH_NO_LAUNCH)
 319     return NULL;
 320
 321   static int last_host_id = 0;
 322   int host_id;
 323   host_id = ++last_host_id;
 324
 325   UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessLaunchCause",
 326                             cause,
 327                             CAUSE_FOR_GPU_LAUNCH_MAX_ENUM);
 328
 329   GpuProcessHost* host = new GpuProcessHost(host_id, kind);
 330   if (host->Init())
 331     return host;
 332
 333   delete host;
 334   return NULL;
 335 }
 336
 337 // static
 338 void GpuProcessHost::GetProcessHandles(
 339     const GpuDataManager::GetGpuProcessHandlesCallback& callback)  {
 340   if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
 341     BrowserThread::PostTask(
 342         BrowserThread::IO,
 343         FROM_HERE,
 344         base::Bind(&GpuProcessHost::GetProcessHandles, callback));
 345     return;
 346   }
 347   std::list<base::ProcessHandle> handles;
 348   for (size_t i = 0; i < arraysize(g_gpu_process_hosts); ++i) {
 349     // TODO(rvargas) crbug/417532: don't store ProcessHandles!.
 350     GpuProcessHost* host = g_gpu_process_hosts[i];
 351     if (host && ValidateHost(host))
 352       handles.push_back(host->process_->GetProcess().Handle());
 353   }
 354   BrowserThread::PostTask(
 355       BrowserThread::UI,
 356       FROM_HERE,
 357       base::Bind(callback, handles));
 358 }
 359
 360 // static
 361 void GpuProcessHost::SendOnIO(GpuProcessKind kind,
 362                               CauseForGpuLaunch cause,
 363                               IPC::Message* message) {
 364   if (!BrowserThread::PostTask(
 365           BrowserThread::IO, FROM_HERE,
 366           base::Bind(
 367               &SendGpuProcessMessage, kind, cause, message))) {
 368     delete message;
 369   }
 370 }
 371
 372 GpuMainThreadFactoryFunction g_gpu_main_thread_factory = NULL;
 373
 374 void GpuProcessHost::RegisterGpuMainThreadFactory(
 375     GpuMainThreadFactoryFunction create) {
 376   g_gpu_main_thread_factory = create;
 377 }
 378
 379 // static
 380 GpuProcessHost* GpuProcessHost::FromID(int host_id) {
 381   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 382
 383   for (int i = 0; i < GPU_PROCESS_KIND_COUNT; ++i) {
 384     GpuProcessHost* host = g_gpu_process_hosts[i];
 385     if (host && host->host_id_ == host_id && ValidateHost(host))
 386       return host;
 387   }
 388
 389   return NULL;
 390 }
 391
 392 GpuProcessHost::GpuProcessHost(int host_id, GpuProcessKind kind)
 393     : host_id_(host_id),
 394       valid_(true),
 395       in_process_(false),
 396       swiftshader_rendering_(false),
 397       kind_(kind),
 398       process_launched_(false),
 399       initialized_(false),
 400       gpu_crash_recorded_(false),
 401       uma_memory_stats_received_(false) {
 402   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 403           switches::kSingleProcess) ||
 404       base::CommandLine::ForCurrentProcess()->HasSwitch(
 405           switches::kInProcessGPU)) {
 406     in_process_ = true;
 407   }
 408
 409   // If the 'single GPU process' policy ever changes, we still want to maintain
 410   // it for 'gpu thread' mode and only create one instance of host and thread.
 411   DCHECK(!in_process_ || g_gpu_process_hosts[kind] == NULL);
 412
 413   g_gpu_process_hosts[kind] = this;
 414
 415   // Post a task to create the corresponding GpuProcessHostUIShim.  The
 416   // GpuProcessHostUIShim will be destroyed if either the browser exits,
 417   // in which case it calls GpuProcessHostUIShim::DestroyAll, or the
 418   // GpuProcessHost is destroyed, which happens when the corresponding GPU
 419   // process terminates or fails to launch.
 420   BrowserThread::PostTask(
 421       BrowserThread::UI,
 422       FROM_HERE,
 423       base::Bind(base::IgnoreResult(&GpuProcessHostUIShim::Create), host_id));
 424
 425   process_.reset(new BrowserChildProcessHostImpl(PROCESS_TYPE_GPU, this));
 426 }
 427
 428 GpuProcessHost::~GpuProcessHost() {
 429   DCHECK(CalledOnValidThread());
 430
 431   SendOutstandingReplies();
 432
 433   RecordProcessCrash();
 434
 435   // In case we never started, clean up.
 436   while (!queued_messages_.empty()) {
 437     delete queued_messages_.front();
 438     queued_messages_.pop();
 439   }
 440
 441 #if defined(OS_MACOSX) && !defined(OS_IOS)
 442   if (!io_surface_manager_token_.IsZero()) {
 443     BrowserIOSurfaceManager::GetInstance()->InvalidateGpuProcessToken();
 444     io_surface_manager_token_.SetZero();
 445   }
 446 #endif
 447
 448   // This is only called on the IO thread so no race against the constructor
 449   // for another GpuProcessHost.
 450   if (g_gpu_process_hosts[kind_] == this)
 451     g_gpu_process_hosts[kind_] = NULL;
 452
 453   // If there are any remaining offscreen contexts at the point the
 454   // GPU process exits, assume something went wrong, and block their
 455   // URLs from accessing client 3D APIs without prompting.
 456   BlockLiveOffscreenContexts();
 457
 458   UMA_HISTOGRAM_COUNTS_100("GPU.AtExitSurfaceCount",
 459                            GpuSurfaceTracker::Get()->GetSurfaceCount());
 460   UMA_HISTOGRAM_BOOLEAN("GPU.AtExitReceivedMemoryStats",
 461                         uma_memory_stats_received_);
 462
 463   if (uma_memory_stats_received_) {
 464     UMA_HISTOGRAM_COUNTS_100("GPU.AtExitManagedMemoryClientCount",
 465                              uma_memory_stats_.client_count);
 466     UMA_HISTOGRAM_COUNTS_100("GPU.AtExitContextGroupCount",
 467                              uma_memory_stats_.context_group_count);
 468     UMA_HISTOGRAM_CUSTOM_COUNTS(
 469         "GPU.AtExitMBytesAllocated",
 470         uma_memory_stats_.bytes_allocated_current / 1024 / 1024, 1, 2000, 50);
 471     UMA_HISTOGRAM_CUSTOM_COUNTS(
 472         "GPU.AtExitMBytesAllocatedMax",
 473         uma_memory_stats_.bytes_allocated_max / 1024 / 1024, 1, 2000, 50);
 474     UMA_HISTOGRAM_CUSTOM_COUNTS(
 475         "GPU.AtExitMBytesLimit",
 476         uma_memory_stats_.bytes_limit / 1024 / 1024, 1, 2000, 50);
 477   }
 478
 479   std::string message;
 480   if (!in_process_) {
 481     int exit_code;
 482     base::TerminationStatus status = process_->GetTerminationStatus(
 483         false /* known_dead */, &exit_code);
 484     UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessTerminationStatus",
 485                               status,
 486                               base::TERMINATION_STATUS_MAX_ENUM);
 487
 488     if (status == base::TERMINATION_STATUS_NORMAL_TERMINATION ||
 489         status == base::TERMINATION_STATUS_ABNORMAL_TERMINATION) {
 490       UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessExitCode",
 491                                 exit_code,
 492                                 RESULT_CODE_LAST_CODE);
 493     }
 494
 495     switch (status) {
 496       case base::TERMINATION_STATUS_NORMAL_TERMINATION:
 497         message = "The GPU process exited normally. Everything is okay.";
 498         break;
 499       case base::TERMINATION_STATUS_ABNORMAL_TERMINATION:
 500         message = base::StringPrintf(
 501             "The GPU process exited with code %d.",
 502             exit_code);
 503         break;
 504       case base::TERMINATION_STATUS_PROCESS_WAS_KILLED:
 505         message = "You killed the GPU process! Why?";
 506         break;
 507 #if defined(OS_CHROMEOS)
 508       case base::TERMINATION_STATUS_PROCESS_WAS_KILLED_BY_OOM:
 509         message = "The GUP process was killed due to out of memory.";
 510         break;
 511 #endif
 512       case base::TERMINATION_STATUS_PROCESS_CRASHED:
 513         message = "The GPU process crashed!";
 514         break;
 515       default:
 516         break;
 517     }
 518   }
 519
 520   BrowserThread::PostTask(BrowserThread::UI,
 521                           FROM_HERE,
 522                           base::Bind(&GpuProcessHostUIShim::Destroy,
 523                                      host_id_,
 524                                      message));
 525 }
 526
 527 bool GpuProcessHost::Init() {
 528   init_start_time_ = base::TimeTicks::Now();
 529
 530   TRACE_EVENT_INSTANT0("gpu", "LaunchGpuProcess", TRACE_EVENT_SCOPE_THREAD);
 531
 532   std::string channel_id = process_->GetHost()->CreateChannel();
 533   if (channel_id.empty())
 534     return false;
 535
 536   if (in_process_) {
 537     DCHECK_CURRENTLY_ON(BrowserThread::IO);
 538     DCHECK(g_gpu_main_thread_factory);
 539     in_process_gpu_thread_.reset(
 540         g_gpu_main_thread_factory(InProcessChildThreadParams(
 541             channel_id, base::MessageLoop::current()->task_runner())));
 542     base::Thread::Options options;
 543 #if defined(OS_WIN)
 544     // WGL needs to create its own window and pump messages on it.
 545     options.message_loop_type = base::MessageLoop::TYPE_UI;
 546 #endif
 547     in_process_gpu_thread_->StartWithOptions(options);
 548
 549     OnProcessLaunched();  // Fake a callback that the process is ready.
 550   } else if (!LaunchGpuProcess(channel_id)) {
 551     return false;
 552   }
 553
 554   if (!Send(new GpuMsg_Initialize()))
 555     return false;
 556
 557 #if defined(OS_MACOSX) && !defined(OS_IOS)
 558   io_surface_manager_token_ =
 559       BrowserIOSurfaceManager::GetInstance()->GenerateGpuProcessToken();
 560   // Note: A valid IOSurface manager token needs to be sent to the Gpu process
 561   // before any GpuMemoryBuffer allocation requests can be sent.
 562   Send(new ChildProcessMsg_SetIOSurfaceManagerToken(io_surface_manager_token_));
 563 #endif
 564
 565   return true;
 566 }
 567
 568 void GpuProcessHost::RouteOnUIThread(const IPC::Message& message) {
 569   BrowserThread::PostTask(
 570       BrowserThread::UI,
 571       FROM_HERE,
 572       base::Bind(&RouteToGpuProcessHostUIShimTask, host_id_, message));
 573 }
 574
 575 bool GpuProcessHost::Send(IPC::Message* msg) {
 576   DCHECK(CalledOnValidThread());
 577   if (process_->GetHost()->IsChannelOpening()) {
 578     queued_messages_.push(msg);
 579     return true;
 580   }
 581
 582   bool result = process_->Send(msg);
 583   if (!result) {
 584     // Channel is hosed, but we may not get destroyed for a while. Send
 585     // outstanding channel creation failures now so that the caller can restart
 586     // with a new process/channel without waiting.
 587     SendOutstandingReplies();
 588   }
 589   return result;
 590 }
 591
 592 void GpuProcessHost::AddFilter(IPC::MessageFilter* filter) {
 593   DCHECK(CalledOnValidThread());
 594   process_->GetHost()->AddFilter(filter);
 595 }
 596
 597 bool GpuProcessHost::OnMessageReceived(const IPC::Message& message) {
 598   DCHECK(CalledOnValidThread());
 599   IPC_BEGIN_MESSAGE_MAP(GpuProcessHost, message)
 600     IPC_MESSAGE_HANDLER(GpuHostMsg_Initialized, OnInitialized)
 601     IPC_MESSAGE_HANDLER(GpuHostMsg_ChannelEstablished, OnChannelEstablished)
 602     IPC_MESSAGE_HANDLER(GpuHostMsg_CommandBufferCreated, OnCommandBufferCreated)
 603     IPC_MESSAGE_HANDLER(GpuHostMsg_DestroyCommandBuffer, OnDestroyCommandBuffer)
 604     IPC_MESSAGE_HANDLER(GpuHostMsg_GpuMemoryBufferCreated,
 605                         OnGpuMemoryBufferCreated)
 606     IPC_MESSAGE_HANDLER(GpuHostMsg_DidCreateOffscreenContext,
 607                         OnDidCreateOffscreenContext)
 608     IPC_MESSAGE_HANDLER(GpuHostMsg_DidLoseContext, OnDidLoseContext)
 609     IPC_MESSAGE_HANDLER(GpuHostMsg_DidDestroyOffscreenContext,
 610                         OnDidDestroyOffscreenContext)
 611     IPC_MESSAGE_HANDLER(GpuHostMsg_GpuMemoryUmaStats,
 612                         OnGpuMemoryUmaStatsReceived)
 613 #if defined(OS_MACOSX)
 614     IPC_MESSAGE_HANDLER_GENERIC(GpuHostMsg_AcceleratedSurfaceBuffersSwapped,
 615                                 OnAcceleratedSurfaceBuffersSwapped(message))
 616 #endif
 617     IPC_MESSAGE_HANDLER(GpuHostMsg_DestroyChannel,
 618                         OnDestroyChannel)
 619     IPC_MESSAGE_HANDLER(GpuHostMsg_CacheShader,
 620                         OnCacheShader)
 621
 622     IPC_MESSAGE_UNHANDLED(RouteOnUIThread(message))
 623   IPC_END_MESSAGE_MAP()
 624
 625   return true;
 626 }
 627
 628 void GpuProcessHost::OnChannelConnected(int32 peer_pid) {
 629   TRACE_EVENT0("gpu", "GpuProcessHost::OnChannelConnected");
 630
 631   while (!queued_messages_.empty()) {
 632     Send(queued_messages_.front());
 633     queued_messages_.pop();
 634   }
 635 }
 636
 637 void GpuProcessHost::EstablishGpuChannel(
 638     int client_id,
 639     bool share_context,
 640     bool allow_future_sync_points,
 641     const EstablishChannelCallback& callback) {
 642   DCHECK(CalledOnValidThread());
 643   TRACE_EVENT0("gpu", "GpuProcessHost::EstablishGpuChannel");
 644
 645   // If GPU features are already blacklisted, no need to establish the channel.
 646   if (!GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL)) {
 647     DVLOG(1) << "GPU blacklisted, refusing to open a GPU channel.";
 648     callback.Run(IPC::ChannelHandle(), gpu::GPUInfo());
 649     return;
 650   }
 651
 652   if (Send(new GpuMsg_EstablishChannel(
 653           client_id, share_context, allow_future_sync_points))) {
 654     channel_requests_.push(callback);
 655   } else {
 656     DVLOG(1) << "Failed to send GpuMsg_EstablishChannel.";
 657     callback.Run(IPC::ChannelHandle(), gpu::GPUInfo());
 658   }
 659
 660   if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
 661       switches::kDisableGpuShaderDiskCache)) {
 662     CreateChannelCache(client_id);
 663   }
 664 }
 665
 666 void GpuProcessHost::CreateViewCommandBuffer(
 667     const gfx::GLSurfaceHandle& compositing_surface,
 668     int surface_id,
 669     int client_id,
 670     const GPUCreateCommandBufferConfig& init_params,
 671     int route_id,
 672     const CreateCommandBufferCallback& callback) {
 673   TRACE_EVENT0("gpu", "GpuProcessHost::CreateViewCommandBuffer");
 674
 675   DCHECK(CalledOnValidThread());
 676
 677   if (!compositing_surface.is_null() &&
 678       Send(new GpuMsg_CreateViewCommandBuffer(
 679           compositing_surface, surface_id, client_id, init_params, route_id))) {
 680     create_command_buffer_requests_.push(callback);
 681     surface_refs_.insert(std::make_pair(surface_id,
 682         GpuSurfaceTracker::GetInstance()->GetSurfaceRefForSurface(surface_id)));
 683   } else {
 684     // Could distinguish here between compositing_surface being NULL
 685     // and Send failing, if desired.
 686     callback.Run(CREATE_COMMAND_BUFFER_FAILED_AND_CHANNEL_LOST);
 687   }
 688 }
 689
 690 void GpuProcessHost::CreateGpuMemoryBuffer(
 691     gfx::GpuMemoryBufferId id,
 692     const gfx::Size& size,
 693     gfx::GpuMemoryBuffer::Format format,
 694     gfx::GpuMemoryBuffer::Usage usage,
 695     int client_id,
 696     int32 surface_id,
 697     const CreateGpuMemoryBufferCallback& callback) {
 698   TRACE_EVENT0("gpu", "GpuProcessHost::CreateGpuMemoryBuffer");
 699
 700   DCHECK(CalledOnValidThread());
 701
 702   GpuMsg_CreateGpuMemoryBuffer_Params params;
 703   params.id = id;
 704   params.size = size;
 705   params.format = format;
 706   params.usage = usage;
 707   params.client_id = client_id;
 708   params.surface_handle =
 709       GpuSurfaceTracker::GetInstance()->GetSurfaceHandle(surface_id).handle;
 710   if (Send(new GpuMsg_CreateGpuMemoryBuffer(params))) {
 711     create_gpu_memory_buffer_requests_.push(callback);
 712     create_gpu_memory_buffer_surface_refs_.push(surface_id);
 713     if (surface_id) {
 714       surface_refs_.insert(std::make_pair(
 715           surface_id, GpuSurfaceTracker::GetInstance()->GetSurfaceRefForSurface(
 716                           surface_id)));
 717     }
 718   } else {
 719     callback.Run(gfx::GpuMemoryBufferHandle());
 720   }
 721 }
 722
 723 void GpuProcessHost::DestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
 724                                             int client_id,
 725                                             int sync_point) {
 726   TRACE_EVENT0("gpu", "GpuProcessHost::DestroyGpuMemoryBuffer");
 727
 728   DCHECK(CalledOnValidThread());
 729
 730   Send(new GpuMsg_DestroyGpuMemoryBuffer(id, client_id, sync_point));
 731 }
 732
 733 void GpuProcessHost::OnInitialized(bool result, const gpu::GPUInfo& gpu_info) {
 734   UMA_HISTOGRAM_BOOLEAN("GPU.GPUProcessInitialized", result);
 735   initialized_ = result;
 736
 737   if (!initialized_)
 738     GpuDataManagerImpl::GetInstance()->OnGpuProcessInitFailure();
 739   else if (!in_process_)
 740     GpuDataManagerImpl::GetInstance()->UpdateGpuInfo(gpu_info);
 741 }
 742
 743 void GpuProcessHost::OnChannelEstablished(
 744     const IPC::ChannelHandle& channel_handle) {
 745   TRACE_EVENT0("gpu", "GpuProcessHost::OnChannelEstablished");
 746
 747   if (channel_requests_.empty()) {
 748     // This happens when GPU process is compromised.
 749     RouteOnUIThread(GpuHostMsg_OnLogMessage(
 750         logging::LOG_WARNING,
 751         "WARNING",
 752         "Received a ChannelEstablished message but no requests in queue."));
 753     return;
 754   }
 755   EstablishChannelCallback callback = channel_requests_.front();
 756   channel_requests_.pop();
 757
 758   // Currently if any of the GPU features are blacklisted, we don't establish a
 759   // GPU channel.
 760   if (!channel_handle.name.empty() &&
 761       !GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL)) {
 762     Send(new GpuMsg_CloseChannel(channel_handle));
 763     callback.Run(IPC::ChannelHandle(), gpu::GPUInfo());
 764     RouteOnUIThread(GpuHostMsg_OnLogMessage(
 765         logging::LOG_WARNING,
 766         "WARNING",
 767         "Hardware acceleration is unavailable."));
 768     return;
 769   }
 770
 771   callback.Run(channel_handle,
 772                GpuDataManagerImpl::GetInstance()->GetGPUInfo());
 773 }
 774
 775 void GpuProcessHost::OnCommandBufferCreated(CreateCommandBufferResult result) {
 776   TRACE_EVENT0("gpu", "GpuProcessHost::OnCommandBufferCreated");
 777
 778   if (create_command_buffer_requests_.empty())
 779     return;
 780
 781   CreateCommandBufferCallback callback =
 782       create_command_buffer_requests_.front();
 783   create_command_buffer_requests_.pop();
 784   callback.Run(result);
 785 }
 786
 787 void GpuProcessHost::OnDestroyCommandBuffer(int32 surface_id) {
 788   TRACE_EVENT0("gpu", "GpuProcessHost::OnDestroyCommandBuffer");
 789   SurfaceRefMap::iterator it = surface_refs_.find(surface_id);
 790   if (it != surface_refs_.end()) {
 791     surface_refs_.erase(it);
 792   }
 793 }
 794
 795 void GpuProcessHost::OnGpuMemoryBufferCreated(
 796     const gfx::GpuMemoryBufferHandle& handle) {
 797   TRACE_EVENT0("gpu", "GpuProcessHost::OnGpuMemoryBufferCreated");
 798
 799   if (create_gpu_memory_buffer_requests_.empty())
 800     return;
 801
 802   CreateGpuMemoryBufferCallback callback =
 803       create_gpu_memory_buffer_requests_.front();
 804   create_gpu_memory_buffer_requests_.pop();
 805   callback.Run(handle);
 806
 807   int32 surface_id = create_gpu_memory_buffer_surface_refs_.front();
 808   create_gpu_memory_buffer_surface_refs_.pop();
 809   SurfaceRefMap::iterator it = surface_refs_.find(surface_id);
 810   if (it != surface_refs_.end()) {
 811     surface_refs_.erase(it);
 812   }
 813 }
 814
 815 void GpuProcessHost::OnDidCreateOffscreenContext(const GURL& url) {
 816   urls_with_live_offscreen_contexts_.insert(url);
 817 }
 818
 819 void GpuProcessHost::OnDidLoseContext(bool offscreen,
 820                                       gpu::error::ContextLostReason reason,
 821                                       const GURL& url) {
 822   // TODO(kbr): would be nice to see the "offscreen" flag too.
 823   TRACE_EVENT2("gpu", "GpuProcessHost::OnDidLoseContext",
 824                "reason", reason,
 825                "url",
 826                url.possibly_invalid_spec());
 827
 828   if (!offscreen || url.is_empty()) {
 829     // Assume that the loss of the compositor's or accelerated canvas'
 830     // context is a serious event and blame the loss on all live
 831     // offscreen contexts. This more robustly handles situations where
 832     // the GPU process may not actually detect the context loss in the
 833     // offscreen context.
 834     BlockLiveOffscreenContexts();
 835     return;
 836   }
 837
 838   GpuDataManagerImpl::DomainGuilt guilt;
 839   switch (reason) {
 840     case gpu::error::kGuilty:
 841       guilt = GpuDataManagerImpl::DOMAIN_GUILT_KNOWN;
 842       break;
 843     case gpu::error::kUnknown:
 844       guilt = GpuDataManagerImpl::DOMAIN_GUILT_UNKNOWN;
 845       break;
 846     case gpu::error::kInnocent:
 847       return;
 848     default:
 849       NOTREACHED();
 850       return;
 851   }
 852
 853   GpuDataManagerImpl::GetInstance()->BlockDomainFrom3DAPIs(url, guilt);
 854 }
 855
 856 void GpuProcessHost::OnDidDestroyOffscreenContext(const GURL& url) {
 857   urls_with_live_offscreen_contexts_.erase(url);
 858 }
 859
 860 void GpuProcessHost::OnGpuMemoryUmaStatsReceived(
 861     const GPUMemoryUmaStats& stats) {
 862   TRACE_EVENT0("gpu", "GpuProcessHost::OnGpuMemoryUmaStatsReceived");
 863   uma_memory_stats_received_ = true;
 864   uma_memory_stats_ = stats;
 865 }
 866
 867 #if defined(OS_MACOSX)
 868 void GpuProcessHost::OnAcceleratedSurfaceBuffersSwapped(
 869     const IPC::Message& message) {
 870   RenderWidgetResizeHelper::Get()->PostGpuProcessMsg(host_id_, message);
 871 }
 872 #endif
 873
 874 void GpuProcessHost::OnProcessLaunched() {
 875   UMA_HISTOGRAM_TIMES("GPU.GPUProcessLaunchTime",
 876                       base::TimeTicks::Now() - init_start_time_);
 877 }
 878
 879 void GpuProcessHost::OnProcessCrashed(int exit_code) {
 880   SendOutstandingReplies();
 881   RecordProcessCrash();
 882   GpuDataManagerImpl::GetInstance()->ProcessCrashed(
 883       process_->GetTerminationStatus(true /* known_dead */, NULL));
 884 }
 885
 886 GpuProcessHost::GpuProcessKind GpuProcessHost::kind() {
 887   return kind_;
 888 }
 889
 890 void GpuProcessHost::ForceShutdown() {
 891   // This is only called on the IO thread so no race against the constructor
 892   // for another GpuProcessHost.
 893   if (g_gpu_process_hosts[kind_] == this)
 894     g_gpu_process_hosts[kind_] = NULL;
 895
 896 #if defined(OS_MACOSX) && !defined(OS_IOS)
 897   if (!io_surface_manager_token_.IsZero()) {
 898     BrowserIOSurfaceManager::GetInstance()->InvalidateGpuProcessToken();
 899     io_surface_manager_token_.SetZero();
 900   }
 901 #endif
 902
 903   process_->ForceShutdown();
 904 }
 905
 906 void GpuProcessHost::BeginFrameSubscription(
 907     int surface_id,
 908     base::WeakPtr<RenderWidgetHostViewFrameSubscriber> subscriber) {
 909   frame_subscribers_[surface_id] = subscriber;
 910 }
 911
 912 void GpuProcessHost::EndFrameSubscription(int surface_id) {
 913   frame_subscribers_.erase(surface_id);
 914 }
 915
 916 bool GpuProcessHost::LaunchGpuProcess(const std::string& channel_id) {
 917   if (!(gpu_enabled_ &&
 918       GpuDataManagerImpl::GetInstance()->ShouldUseSwiftShader()) &&
 919       !hardware_gpu_enabled_) {
 920     SendOutstandingReplies();
 921     return false;
 922   }
 923
 924   const base::CommandLine& browser_command_line =
 925       *base::CommandLine::ForCurrentProcess();
 926
 927   base::CommandLine::StringType gpu_launcher =
 928       browser_command_line.GetSwitchValueNative(switches::kGpuLauncher);
 929
 930 #if defined(OS_ANDROID)
 931   // crbug.com/447735. readlink("self/proc/exe") sometimes fails on Android
 932   // at startup with EACCES. As a workaround ignore this here, since the
 933   // executable name is actually not used or useful anyways.
 934   base::CommandLine* cmd_line =
 935       new base::CommandLine(base::CommandLine::NO_PROGRAM);
 936 #else
 937 #if defined(OS_LINUX)
 938   int child_flags = gpu_launcher.empty() ? ChildProcessHost::CHILD_ALLOW_SELF :
 939                                            ChildProcessHost::CHILD_NORMAL;
 940 #else
 941   int child_flags = ChildProcessHost::CHILD_NORMAL;
 942 #endif
 943
 944   base::FilePath exe_path = ChildProcessHost::GetChildPath(child_flags);
 945   if (exe_path.empty())
 946     return false;
 947
 948   base::CommandLine* cmd_line = new base::CommandLine(exe_path);
 949 #endif
 950   cmd_line->AppendSwitchASCII(switches::kProcessType, switches::kGpuProcess);
 951   cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
 952
 953   if (kind_ == GPU_PROCESS_KIND_UNSANDBOXED)
 954     cmd_line->AppendSwitch(switches::kDisableGpuSandbox);
 955
 956   // If you want a browser command-line switch passed to the GPU process
 957   // you need to add it to |kSwitchNames| at the beginning of this file.
 958   cmd_line->CopySwitchesFrom(browser_command_line, kSwitchNames,
 959                              arraysize(kSwitchNames));
 960   cmd_line->CopySwitchesFrom(
 961       browser_command_line, switches::kGpuSwitches, switches::kNumGpuSwitches);
 962   cmd_line->CopySwitchesFrom(
 963       browser_command_line, switches::kGLSwitchesCopiedFromGpuProcessHost,
 964       switches::kGLSwitchesCopiedFromGpuProcessHostNumSwitches);
 965
 966   GetContentClient()->browser()->AppendExtraCommandLineSwitches(
 967       cmd_line, process_->GetData().id);
 968
 969   GpuDataManagerImpl::GetInstance()->AppendGpuCommandLine(cmd_line);
 970
 971   if (cmd_line->HasSwitch(switches::kUseGL)) {
 972     swiftshader_rendering_ =
 973         (cmd_line->GetSwitchValueASCII(switches::kUseGL) == "swiftshader");
 974   }
 975
 976   UMA_HISTOGRAM_BOOLEAN("GPU.GPU.GPUProcessSoftwareRendering",
 977                         swiftshader_rendering_);
 978
 979   // If specified, prepend a launcher program to the command line.
 980   if (!gpu_launcher.empty())
 981     cmd_line->PrependWrapper(gpu_launcher);
 982
 983   process_->Launch(
 984       new GpuSandboxedProcessLauncherDelegate(cmd_line,
 985                                               process_->GetHost()),
 986       cmd_line,
 987       true);
 988   process_launched_ = true;
 989
 990   UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessLifetimeEvents",
 991                             LAUNCHED, GPU_PROCESS_LIFETIME_EVENT_MAX);
 992   return true;
 993 }
 994
 995 void GpuProcessHost::SendOutstandingReplies() {
 996   valid_ = false;
 997   // First send empty channel handles for all EstablishChannel requests.
 998   while (!channel_requests_.empty()) {
 999     EstablishChannelCallback callback = channel_requests_.front();
1000     channel_requests_.pop();
1001     callback.Run(IPC::ChannelHandle(), gpu::GPUInfo());
1002   }
1003
1004   while (!create_command_buffer_requests_.empty()) {
1005     CreateCommandBufferCallback callback =
1006         create_command_buffer_requests_.front();
1007     create_command_buffer_requests_.pop();
1008     callback.Run(CREATE_COMMAND_BUFFER_FAILED_AND_CHANNEL_LOST);
1009   }
1010
1011   while (!create_gpu_memory_buffer_requests_.empty()) {
1012     CreateGpuMemoryBufferCallback callback =
1013         create_gpu_memory_buffer_requests_.front();
1014     create_gpu_memory_buffer_requests_.pop();
1015     callback.Run(gfx::GpuMemoryBufferHandle());
1016   }
1017 }
1018
1019 void GpuProcessHost::BlockLiveOffscreenContexts() {
1020   for (std::multiset<GURL>::iterator iter =
1021            urls_with_live_offscreen_contexts_.begin();
1022        iter != urls_with_live_offscreen_contexts_.end(); ++iter) {
1023     GpuDataManagerImpl::GetInstance()->BlockDomainFrom3DAPIs(
1024         *iter, GpuDataManagerImpl::DOMAIN_GUILT_UNKNOWN);
1025   }
1026 }
1027
1028 void GpuProcessHost::RecordProcessCrash() {
1029   // Skip if a GPU process crash was already counted.
1030   if (gpu_crash_recorded_)
1031     return;
1032
1033   // Maximum number of times the GPU process is allowed to crash in a session.
1034   // Once this limit is reached, any request to launch the GPU process will
1035   // fail.
1036   const int kGpuMaxCrashCount = 3;
1037
1038   // Last time the GPU process crashed.
1039   static base::Time last_gpu_crash_time;
1040
1041   bool disable_crash_limit = base::CommandLine::ForCurrentProcess()->HasSwitch(
1042       switches::kDisableGpuProcessCrashLimit);
1043
1044   // Ending only acts as a failure if the GPU process was actually started and
1045   // was intended for actual rendering (and not just checking caps or other
1046   // options).
1047   if (process_launched_ && kind_ == GPU_PROCESS_KIND_SANDBOXED) {
1048     gpu_crash_recorded_ = true;
1049     if (swiftshader_rendering_) {
1050       UMA_HISTOGRAM_ENUMERATION("GPU.SwiftShaderLifetimeEvents",
1051                                 DIED_FIRST_TIME + swiftshader_crash_count_,
1052                                 GPU_PROCESS_LIFETIME_EVENT_MAX);
1053
1054       if (++swiftshader_crash_count_ >= kGpuMaxCrashCount &&
1055           !disable_crash_limit) {
1056         // SwiftShader is too unstable to use. Disable it for current session.
1057         gpu_enabled_ = false;
1058       }
1059     } else {
1060       ++gpu_crash_count_;
1061       UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessLifetimeEvents",
1062                                 std::min(DIED_FIRST_TIME + gpu_crash_count_,
1063                                          GPU_PROCESS_LIFETIME_EVENT_MAX - 1),
1064                                 GPU_PROCESS_LIFETIME_EVENT_MAX);
1065
1066       // Allow about 1 GPU crash per hour to be removed from the crash count,
1067       // so very occasional crashes won't eventually add up and prevent the
1068       // GPU process from launching.
1069       ++gpu_recent_crash_count_;
1070       base::Time current_time = base::Time::Now();
1071       if (crashed_before_) {
1072         int hours_different = (current_time - last_gpu_crash_time).InHours();
1073         gpu_recent_crash_count_ =
1074             std::max(0, gpu_recent_crash_count_ - hours_different);
1075       }
1076
1077       crashed_before_ = true;
1078       last_gpu_crash_time = current_time;
1079
1080       if ((gpu_recent_crash_count_ >= kGpuMaxCrashCount &&
1081            !disable_crash_limit) ||
1082           !initialized_) {
1083 #if !defined(OS_CHROMEOS)
1084         // The GPU process is too unstable to use. Disable it for current
1085         // session.
1086         hardware_gpu_enabled_ = false;
1087         GpuDataManagerImpl::GetInstance()->DisableHardwareAcceleration();
1088 #endif
1089       }
1090     }
1091   }
1092 }
1093
1094 std::string GpuProcessHost::GetShaderPrefixKey() {
1095   if (shader_prefix_key_.empty()) {
1096     gpu::GPUInfo info = GpuDataManagerImpl::GetInstance()->GetGPUInfo();
1097
1098     std::string in_str = GetContentClient()->GetProduct() + "-" +
1099 #if defined(OS_ANDROID)
1100         base::android::BuildInfo::GetInstance()->android_build_fp() + "-" +
1101 #endif
1102         info.gl_vendor + "-" + info.gl_renderer + "-" +
1103         info.driver_version + "-" + info.driver_vendor;
1104
1105     base::Base64Encode(base::SHA1HashString(in_str), &shader_prefix_key_);
1106   }
1107
1108   return shader_prefix_key_;
1109 }
1110
1111 void GpuProcessHost::LoadedShader(const std::string& key,
1112                                   const std::string& data) {
1113   std::string prefix = GetShaderPrefixKey();
1114   if (!key.compare(0, prefix.length(), prefix))
1115     Send(new GpuMsg_LoadedShader(data));
1116 }
1117
1118 void GpuProcessHost::CreateChannelCache(int32 client_id) {
1119   TRACE_EVENT0("gpu", "GpuProcessHost::CreateChannelCache");
1120
1121   scoped_refptr<ShaderDiskCache> cache =
1122       ShaderCacheFactory::GetInstance()->Get(client_id);
1123   if (!cache.get())
1124     return;
1125
1126   cache->set_host_id(host_id_);
1127
1128   client_id_to_shader_cache_[client_id] = cache;
1129 }
1130
1131 void GpuProcessHost::OnDestroyChannel(int32 client_id) {
1132   TRACE_EVENT0("gpu", "GpuProcessHost::OnDestroyChannel");
1133   client_id_to_shader_cache_.erase(client_id);
1134 }
1135
1136 void GpuProcessHost::OnCacheShader(int32 client_id,
1137                                    const std::string& key,
1138                                    const std::string& shader) {
1139   TRACE_EVENT0("gpu", "GpuProcessHost::OnCacheShader");
1140   ClientIdToShaderCacheMap::iterator iter =
1141       client_id_to_shader_cache_.find(client_id);
1142   // If the cache doesn't exist then this is an off the record profile.
1143   if (iter == client_id_to_shader_cache_.end())
1144     return;
1145   iter->second->Cache(GetShaderPrefixKey() + ":" + key, shader);
1146 }
1147
1148 }  // namespace content