remoting/host/desktop_session_proxy.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 "remoting/host/desktop_session_proxy.h"
   6
   7 #include "base/compiler_specific.h"
   8 #include "base/logging.h"
   9 #include "base/process/process_handle.h"
  10 #include "base/memory/shared_memory.h"
  11 #include "base/single_thread_task_runner.h"
  12 #include "ipc/ipc_channel_proxy.h"
  13 #include "ipc/ipc_message_macros.h"
  14 #include "remoting/base/capabilities.h"
  15 #include "remoting/host/chromoting_messages.h"
  16 #include "remoting/host/client_session.h"
  17 #include "remoting/host/client_session_control.h"
  18 #include "remoting/host/desktop_session_connector.h"
  19 #include "remoting/host/ipc_audio_capturer.h"
  20 #include "remoting/host/ipc_input_injector.h"
  21 #include "remoting/host/ipc_mouse_cursor_monitor.h"
  22 #include "remoting/host/ipc_screen_controls.h"
  23 #include "remoting/host/ipc_video_frame_capturer.h"
  24 #include "remoting/proto/audio.pb.h"
  25 #include "remoting/proto/control.pb.h"
  26 #include "remoting/proto/event.pb.h"
  27 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
  28 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
  29 #include "third_party/webrtc/modules/desktop_capture/mouse_cursor.h"
  30 #include "third_party/webrtc/modules/desktop_capture/shared_memory.h"
  31
  32 #if defined(OS_WIN)
  33 #include "base/win/scoped_handle.h"
  34 #endif  // defined(OS_WIN)
  35
  36 const bool kReadOnly = true;
  37 const char kSendInitialResolution[] = "sendInitialResolution";
  38 const char kRateLimitResizeRequests[] = "rateLimitResizeRequests";
  39
  40 namespace remoting {
  41
  42 class DesktopSessionProxy::IpcSharedBufferCore
  43     : public base::RefCountedThreadSafe<IpcSharedBufferCore> {
  44  public:
  45   IpcSharedBufferCore(int id,
  46                       base::SharedMemoryHandle handle,
  47                       base::ProcessHandle process,
  48                       size_t size)
  49       : id_(id),
  50 #if defined(OS_WIN)
  51         shared_memory_(handle, kReadOnly, process),
  52 #else  // !defined(OS_WIN)
  53         shared_memory_(handle, kReadOnly),
  54 #endif  // !defined(OS_WIN)
  55         size_(size) {
  56     if (!shared_memory_.Map(size)) {
  57       LOG(ERROR) << "Failed to map a shared buffer: id=" << id
  58 #if defined(OS_WIN)
  59                  << ", handle=" << handle
  60 #else
  61                  << ", handle.fd=" << handle.fd
  62 #endif
  63                  << ", size=" << size;
  64     }
  65   }
  66
  67   int id() { return id_; }
  68   size_t size() { return size_; }
  69   void* memory() { return shared_memory_.memory(); }
  70   webrtc::SharedMemory::Handle handle() {
  71 #if defined(OS_WIN)
  72     return shared_memory_.handle();
  73 #else
  74     return shared_memory_.handle().fd;
  75 #endif
  76   }
  77
  78  private:
  79   virtual ~IpcSharedBufferCore() {}
  80   friend class base::RefCountedThreadSafe<IpcSharedBufferCore>;
  81
  82   int id_;
  83   base::SharedMemory shared_memory_;
  84   size_t size_;
  85
  86   DISALLOW_COPY_AND_ASSIGN(IpcSharedBufferCore);
  87 };
  88
  89 class DesktopSessionProxy::IpcSharedBuffer : public webrtc::SharedMemory {
  90  public:
  91   IpcSharedBuffer(scoped_refptr<IpcSharedBufferCore> core)
  92       : SharedMemory(core->memory(), core->size(),
  93                      core->handle(), core->id()),
  94         core_(core) {
  95   }
  96
  97  private:
  98   scoped_refptr<IpcSharedBufferCore> core_;
  99
 100   DISALLOW_COPY_AND_ASSIGN(IpcSharedBuffer);
 101 };
 102
 103 DesktopSessionProxy::DesktopSessionProxy(
 104     scoped_refptr<base::SingleThreadTaskRunner> audio_capture_task_runner,
 105     scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
 106     scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
 107     scoped_refptr<base::SingleThreadTaskRunner> video_capture_task_runner,
 108     base::WeakPtr<ClientSessionControl> client_session_control,
 109     base::WeakPtr<DesktopSessionConnector> desktop_session_connector,
 110     bool virtual_terminal)
 111     : audio_capture_task_runner_(audio_capture_task_runner),
 112       caller_task_runner_(caller_task_runner),
 113       io_task_runner_(io_task_runner),
 114       video_capture_task_runner_(video_capture_task_runner),
 115       client_session_control_(client_session_control),
 116       desktop_session_connector_(desktop_session_connector),
 117       pending_capture_frame_requests_(0),
 118       is_desktop_session_connected_(false),
 119       virtual_terminal_(virtual_terminal) {
 120   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 121 }
 122
 123 scoped_ptr<AudioCapturer> DesktopSessionProxy::CreateAudioCapturer() {
 124   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 125
 126   return make_scoped_ptr(new IpcAudioCapturer(this));
 127 }
 128
 129 scoped_ptr<InputInjector> DesktopSessionProxy::CreateInputInjector() {
 130   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 131
 132   return make_scoped_ptr(new IpcInputInjector(this));
 133 }
 134
 135 scoped_ptr<ScreenControls> DesktopSessionProxy::CreateScreenControls() {
 136   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 137
 138   return make_scoped_ptr(new IpcScreenControls(this));
 139 }
 140
 141 scoped_ptr<webrtc::DesktopCapturer> DesktopSessionProxy::CreateVideoCapturer() {
 142   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 143
 144   return make_scoped_ptr(new IpcVideoFrameCapturer(this));
 145 }
 146
 147 scoped_ptr<webrtc::MouseCursorMonitor>
 148     DesktopSessionProxy::CreateMouseCursorMonitor() {
 149   return make_scoped_ptr(new IpcMouseCursorMonitor(this));
 150 }
 151
 152 std::string DesktopSessionProxy::GetCapabilities() const {
 153   std::string result = kRateLimitResizeRequests;
 154   // Ask the client to send its resolution unconditionally.
 155   if (virtual_terminal_)
 156     result = result + " " + kSendInitialResolution;
 157   return result;
 158 }
 159
 160 void DesktopSessionProxy::SetCapabilities(const std::string& capabilities) {
 161   // Delay creation of the desktop session until the client screen resolution is
 162   // received if the desktop session requires the initial screen resolution
 163   // (when |virtual_terminal_| is true) and the client is expected to
 164   // sent its screen resolution (the 'sendInitialResolution' capability is
 165   // supported).
 166   if (virtual_terminal_ &&
 167       HasCapability(capabilities, kSendInitialResolution)) {
 168     VLOG(1) << "Waiting for the client screen resolution.";
 169     return;
 170   }
 171
 172   // Connect to the desktop session.
 173   if (!is_desktop_session_connected_) {
 174     is_desktop_session_connected_ = true;
 175     if (desktop_session_connector_.get()) {
 176       desktop_session_connector_->ConnectTerminal(
 177           this, screen_resolution_, virtual_terminal_);
 178     }
 179   }
 180 }
 181
 182 bool DesktopSessionProxy::OnMessageReceived(const IPC::Message& message) {
 183   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 184
 185   bool handled = true;
 186   IPC_BEGIN_MESSAGE_MAP(DesktopSessionProxy, message)
 187     IPC_MESSAGE_HANDLER(ChromotingDesktopNetworkMsg_AudioPacket,
 188                         OnAudioPacket)
 189     IPC_MESSAGE_HANDLER(ChromotingDesktopNetworkMsg_CaptureCompleted,
 190                         OnCaptureCompleted)
 191     IPC_MESSAGE_HANDLER(ChromotingDesktopNetworkMsg_MouseCursor,
 192                         OnMouseCursor)
 193     IPC_MESSAGE_HANDLER(ChromotingDesktopNetworkMsg_CreateSharedBuffer,
 194                         OnCreateSharedBuffer)
 195     IPC_MESSAGE_HANDLER(ChromotingDesktopNetworkMsg_ReleaseSharedBuffer,
 196                         OnReleaseSharedBuffer)
 197     IPC_MESSAGE_HANDLER(ChromotingDesktopNetworkMsg_InjectClipboardEvent,
 198                         OnInjectClipboardEvent)
 199     IPC_MESSAGE_HANDLER(ChromotingDesktopNetworkMsg_DisconnectSession,
 200                         DisconnectSession);
 201   IPC_END_MESSAGE_MAP()
 202
 203   CHECK(handled) << "Received unexpected IPC type: " << message.type();
 204   return handled;
 205 }
 206
 207 void DesktopSessionProxy::OnChannelConnected(int32 peer_pid) {
 208   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 209
 210   VLOG(1) << "IPC: network <- desktop (" << peer_pid << ")";
 211 }
 212
 213 void DesktopSessionProxy::OnChannelError() {
 214   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 215
 216   DetachFromDesktop();
 217 }
 218
 219 bool DesktopSessionProxy::AttachToDesktop(
 220     base::Process desktop_process,
 221     IPC::PlatformFileForTransit desktop_pipe) {
 222   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 223   DCHECK(!desktop_channel_);
 224   DCHECK(!desktop_process_.IsValid());
 225
 226   // Ignore the attach notification if the client session has been disconnected
 227   // already.
 228   if (!client_session_control_.get())
 229     return false;
 230
 231   desktop_process_ = desktop_process.Pass();
 232
 233 #if defined(OS_WIN)
 234   // On Windows: |desktop_process| is a valid handle, but |desktop_pipe| needs
 235   // to be duplicated from the desktop process.
 236   HANDLE temp_handle;
 237   if (!DuplicateHandle(desktop_process_.Handle(), desktop_pipe,
 238                        GetCurrentProcess(), &temp_handle, 0,
 239                        FALSE, DUPLICATE_SAME_ACCESS)) {
 240     PLOG(ERROR) << "Failed to duplicate the desktop-to-network pipe handle";
 241
 242     desktop_process_.Close();
 243     return false;
 244   }
 245   base::win::ScopedHandle pipe(temp_handle);
 246
 247   IPC::ChannelHandle desktop_channel_handle(pipe.Get());
 248
 249 #elif defined(OS_POSIX)
 250   // On posix: |desktop_pipe| is a valid file descriptor.
 251   DCHECK(desktop_pipe.auto_close);
 252
 253   IPC::ChannelHandle desktop_channel_handle(std::string(), desktop_pipe);
 254
 255 #else
 256 #error Unsupported platform.
 257 #endif
 258
 259   // Connect to the desktop process.
 260   desktop_channel_ = IPC::ChannelProxy::Create(desktop_channel_handle,
 261                                                IPC::Channel::MODE_CLIENT,
 262                                                this,
 263                                                io_task_runner_.get());
 264
 265   // Pass ID of the client (which is authenticated at this point) to the desktop
 266   // session agent and start the agent.
 267   SendToDesktop(new ChromotingNetworkDesktopMsg_StartSessionAgent(
 268       client_session_control_->client_jid(),
 269       screen_resolution_,
 270       virtual_terminal_));
 271
 272   return true;
 273 }
 274
 275 void DesktopSessionProxy::DetachFromDesktop() {
 276   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 277
 278   desktop_channel_.reset();
 279
 280   if (desktop_process_.IsValid())
 281     desktop_process_.Close();
 282
 283   shared_buffers_.clear();
 284
 285   // Generate fake responses to keep the video capturer in sync.
 286   while (pending_capture_frame_requests_) {
 287     --pending_capture_frame_requests_;
 288     PostCaptureCompleted(nullptr);
 289   }
 290 }
 291
 292 void DesktopSessionProxy::SetAudioCapturer(
 293     const base::WeakPtr<IpcAudioCapturer>& audio_capturer) {
 294   DCHECK(audio_capture_task_runner_->BelongsToCurrentThread());
 295
 296   audio_capturer_ = audio_capturer;
 297 }
 298
 299 void DesktopSessionProxy::CaptureFrame() {
 300   if (!caller_task_runner_->BelongsToCurrentThread()) {
 301     caller_task_runner_->PostTask(
 302         FROM_HERE, base::Bind(&DesktopSessionProxy::CaptureFrame, this));
 303     return;
 304   }
 305
 306   if (desktop_channel_) {
 307     ++pending_capture_frame_requests_;
 308     SendToDesktop(new ChromotingNetworkDesktopMsg_CaptureFrame());
 309   } else {
 310     PostCaptureCompleted(nullptr);
 311   }
 312 }
 313
 314 void DesktopSessionProxy::SetVideoCapturer(
 315     const base::WeakPtr<IpcVideoFrameCapturer> video_capturer) {
 316   DCHECK(video_capture_task_runner_->BelongsToCurrentThread());
 317
 318   video_capturer_ = video_capturer;
 319 }
 320
 321 void DesktopSessionProxy::SetMouseCursorMonitor(
 322     const base::WeakPtr<IpcMouseCursorMonitor>& mouse_cursor_monitor) {
 323   DCHECK(video_capture_task_runner_->BelongsToCurrentThread());
 324
 325   mouse_cursor_monitor_ = mouse_cursor_monitor;
 326 }
 327
 328 void DesktopSessionProxy::DisconnectSession() {
 329   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 330
 331   // Disconnect the client session if it hasn't been disconnected yet.
 332   if (client_session_control_.get())
 333     client_session_control_->DisconnectSession();
 334 }
 335
 336 void DesktopSessionProxy::InjectClipboardEvent(
 337     const protocol::ClipboardEvent& event) {
 338   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 339
 340   std::string serialized_event;
 341   if (!event.SerializeToString(&serialized_event)) {
 342     LOG(ERROR) << "Failed to serialize protocol::ClipboardEvent.";
 343     return;
 344   }
 345
 346   SendToDesktop(
 347       new ChromotingNetworkDesktopMsg_InjectClipboardEvent(serialized_event));
 348 }
 349
 350 void DesktopSessionProxy::InjectKeyEvent(const protocol::KeyEvent& event) {
 351   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 352
 353   std::string serialized_event;
 354   if (!event.SerializeToString(&serialized_event)) {
 355     LOG(ERROR) << "Failed to serialize protocol::KeyEvent.";
 356     return;
 357   }
 358
 359   SendToDesktop(
 360       new ChromotingNetworkDesktopMsg_InjectKeyEvent(serialized_event));
 361 }
 362
 363 void DesktopSessionProxy::InjectTextEvent(const protocol::TextEvent& event) {
 364   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 365
 366   std::string serialized_event;
 367   if (!event.SerializeToString(&serialized_event)) {
 368     LOG(ERROR) << "Failed to serialize protocol::TextEvent.";
 369     return;
 370   }
 371
 372   SendToDesktop(
 373       new ChromotingNetworkDesktopMsg_InjectTextEvent(serialized_event));
 374 }
 375
 376 void DesktopSessionProxy::InjectMouseEvent(const protocol::MouseEvent& event) {
 377   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 378
 379   std::string serialized_event;
 380   if (!event.SerializeToString(&serialized_event)) {
 381     LOG(ERROR) << "Failed to serialize protocol::MouseEvent.";
 382     return;
 383   }
 384
 385   SendToDesktop(
 386       new ChromotingNetworkDesktopMsg_InjectMouseEvent(serialized_event));
 387 }
 388
 389 void DesktopSessionProxy::InjectTouchEvent(const protocol::TouchEvent& event) {
 390   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 391
 392   std::string serialized_event;
 393   if (!event.SerializeToString(&serialized_event)) {
 394     LOG(ERROR) << "Failed to serialize protocol::TouchEvent.";
 395     return;
 396   }
 397
 398   SendToDesktop(
 399       new ChromotingNetworkDesktopMsg_InjectTouchEvent(serialized_event));
 400 }
 401
 402 void DesktopSessionProxy::StartInputInjector(
 403     scoped_ptr<protocol::ClipboardStub> client_clipboard) {
 404   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 405
 406   client_clipboard_ = client_clipboard.Pass();
 407 }
 408
 409 void DesktopSessionProxy::SetScreenResolution(
 410     const ScreenResolution& resolution) {
 411   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 412
 413   if (resolution.IsEmpty())
 414     return;
 415
 416   screen_resolution_ = resolution;
 417
 418   // Connect to the desktop session if it is not done yet.
 419   if (!is_desktop_session_connected_) {
 420     is_desktop_session_connected_ = true;
 421     if (desktop_session_connector_.get()) {
 422       desktop_session_connector_->ConnectTerminal(
 423           this, screen_resolution_, virtual_terminal_);
 424     }
 425     return;
 426   }
 427
 428   // Pass the client's resolution to both daemon and desktop session agent.
 429   // Depending on the session kind the screen resolution can be set by either
 430   // the daemon (for example RDP sessions on Windows) or by the desktop session
 431   // agent (when sharing the physical console).
 432   if (desktop_session_connector_.get())
 433     desktop_session_connector_->SetScreenResolution(this, screen_resolution_);
 434   SendToDesktop(
 435       new ChromotingNetworkDesktopMsg_SetScreenResolution(screen_resolution_));
 436 }
 437
 438 DesktopSessionProxy::~DesktopSessionProxy() {
 439   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 440
 441   if (desktop_session_connector_.get() && is_desktop_session_connected_)
 442     desktop_session_connector_->DisconnectTerminal(this);
 443 }
 444
 445 scoped_refptr<DesktopSessionProxy::IpcSharedBufferCore>
 446 DesktopSessionProxy::GetSharedBufferCore(int id) {
 447   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 448
 449   SharedBuffers::const_iterator i = shared_buffers_.find(id);
 450   if (i != shared_buffers_.end()) {
 451     return i->second;
 452   } else {
 453     LOG(ERROR) << "Failed to find the shared buffer " << id;
 454     return nullptr;
 455   }
 456 }
 457
 458 void DesktopSessionProxy::OnAudioPacket(const std::string& serialized_packet) {
 459   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 460
 461   // Parse a serialized audio packet. No further validation is done since
 462   // the message was sent by more privileged process.
 463   scoped_ptr<AudioPacket> packet(new AudioPacket());
 464   if (!packet->ParseFromString(serialized_packet)) {
 465     LOG(ERROR) << "Failed to parse AudioPacket.";
 466     return;
 467   }
 468
 469   // Pass a captured audio packet to |audio_capturer_|.
 470   audio_capture_task_runner_->PostTask(
 471       FROM_HERE, base::Bind(&IpcAudioCapturer::OnAudioPacket, audio_capturer_,
 472                             base::Passed(&packet)));
 473 }
 474
 475 void DesktopSessionProxy::OnCreateSharedBuffer(
 476     int id,
 477     IPC::PlatformFileForTransit handle,
 478     uint32 size) {
 479   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 480
 481   scoped_refptr<IpcSharedBufferCore> shared_buffer =
 482       new IpcSharedBufferCore(id, handle, desktop_process_.Handle(), size);
 483
 484   if (shared_buffer->memory() != nullptr &&
 485       !shared_buffers_.insert(std::make_pair(id, shared_buffer)).second) {
 486     LOG(ERROR) << "Duplicate shared buffer id " << id << " encountered";
 487   }
 488 }
 489
 490 void DesktopSessionProxy::OnReleaseSharedBuffer(int id) {
 491   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 492
 493   // Drop the cached reference to the buffer.
 494   shared_buffers_.erase(id);
 495 }
 496
 497 void DesktopSessionProxy::OnCaptureCompleted(
 498     const SerializedDesktopFrame& serialized_frame) {
 499   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 500
 501   // Assume that |serialized_frame| is well-formed because it was received from
 502   // a more privileged process.
 503   scoped_refptr<IpcSharedBufferCore> shared_buffer_core =
 504       GetSharedBufferCore(serialized_frame.shared_buffer_id);
 505   CHECK(shared_buffer_core.get());
 506
 507   scoped_ptr<webrtc::DesktopFrame> frame(
 508       new webrtc::SharedMemoryDesktopFrame(
 509           serialized_frame.dimensions, serialized_frame.bytes_per_row,
 510           new IpcSharedBuffer(shared_buffer_core)));
 511   frame->set_capture_time_ms(serialized_frame.capture_time_ms);
 512   frame->set_dpi(serialized_frame.dpi);
 513
 514   for (size_t i = 0; i < serialized_frame.dirty_region.size(); ++i) {
 515     frame->mutable_updated_region()->AddRect(serialized_frame.dirty_region[i]);
 516   }
 517
 518   --pending_capture_frame_requests_;
 519   PostCaptureCompleted(frame.Pass());
 520 }
 521
 522 void DesktopSessionProxy::OnMouseCursor(
 523     const webrtc::MouseCursor& mouse_cursor) {
 524   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 525   PostMouseCursor(make_scoped_ptr(webrtc::MouseCursor::CopyOf(mouse_cursor)));
 526 }
 527
 528 void DesktopSessionProxy::OnInjectClipboardEvent(
 529     const std::string& serialized_event) {
 530   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 531
 532   if (client_clipboard_) {
 533     protocol::ClipboardEvent event;
 534     if (!event.ParseFromString(serialized_event)) {
 535       LOG(ERROR) << "Failed to parse protocol::ClipboardEvent.";
 536       return;
 537     }
 538
 539     client_clipboard_->InjectClipboardEvent(event);
 540   }
 541 }
 542
 543 void DesktopSessionProxy::PostCaptureCompleted(
 544     scoped_ptr<webrtc::DesktopFrame> frame) {
 545   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 546
 547   video_capture_task_runner_->PostTask(
 548       FROM_HERE,
 549       base::Bind(&IpcVideoFrameCapturer::OnCaptureCompleted, video_capturer_,
 550                  base::Passed(&frame)));
 551 }
 552
 553 void DesktopSessionProxy::PostMouseCursor(
 554     scoped_ptr<webrtc::MouseCursor> mouse_cursor) {
 555   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 556
 557   video_capture_task_runner_->PostTask(
 558       FROM_HERE,
 559       base::Bind(&IpcMouseCursorMonitor::OnMouseCursor, mouse_cursor_monitor_,
 560                  base::Passed(&mouse_cursor)));
 561 }
 562
 563 void DesktopSessionProxy::SendToDesktop(IPC::Message* message) {
 564   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 565
 566   if (desktop_channel_) {
 567     desktop_channel_->Send(message);
 568   } else {
 569     delete message;
 570   }
 571 }
 572
 573 // static
 574 void DesktopSessionProxyTraits::Destruct(
 575     const DesktopSessionProxy* desktop_session_proxy) {
 576   desktop_session_proxy->caller_task_runner_->DeleteSoon(FROM_HERE,
 577                                                          desktop_session_proxy);
 578 }
 579
 580 }  // namespace remoting