content/child/resource_dispatcher.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 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
   6
   7 #include "content/child/resource_dispatcher.h"
   8
   9 #include "base/basictypes.h"
  10 #include "base/bind.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/debug/alias.h"
  13 #include "base/debug/dump_without_crashing.h"
  14 #include "base/files/file_path.h"
  15 #include "base/memory/shared_memory.h"
  16 #include "base/message_loop/message_loop.h"
  17 #include "base/metrics/histogram.h"
  18 #include "base/strings/string_util.h"
  19 #include "content/child/request_extra_data.h"
  20 #include "content/child/request_info.h"
  21 #include "content/child/shared_memory_received_data_factory.h"
  22 #include "content/child/site_isolation_stats_gatherer.h"
  23 #include "content/child/sync_load_response.h"
  24 #include "content/child/threaded_data_provider.h"
  25 #include "content/common/inter_process_time_ticks_converter.h"
  26 #include "content/common/resource_messages.h"
  27 #include "content/public/child/fixed_received_data.h"
  28 #include "content/public/child/request_peer.h"
  29 #include "content/public/child/resource_dispatcher_delegate.h"
  30 #include "content/public/common/resource_response.h"
  31 #include "content/public/common/resource_type.h"
  32 #include "net/base/net_errors.h"
  33 #include "net/base/net_util.h"
  34 #include "net/base/request_priority.h"
  35 #include "net/http/http_response_headers.h"
  36
  37 namespace content {
  38
  39 namespace {
  40
  41 // Converts |time| from a remote to local TimeTicks, overwriting the original
  42 // value.
  43 void RemoteToLocalTimeTicks(
  44     const InterProcessTimeTicksConverter& converter,
  45     base::TimeTicks* time) {
  46   RemoteTimeTicks remote_time = RemoteTimeTicks::FromTimeTicks(*time);
  47   *time = converter.ToLocalTimeTicks(remote_time).ToTimeTicks();
  48 }
  49
  50 void CrashOnMapFailure() {
  51 #if defined(OS_WIN)
  52   DWORD last_err = GetLastError();
  53   base::debug::Alias(&last_err);
  54 #endif
  55   CHECK(false);
  56 }
  57
  58 // Each resource request is assigned an ID scoped to this process.
  59 int MakeRequestID() {
  60   // NOTE: The resource_dispatcher_host also needs probably unique
  61   // request_ids, so they count down from -2 (-1 is a special we're
  62   // screwed value), while the renderer process counts up.
  63   static int next_request_id = 0;
  64   return next_request_id++;
  65 }
  66
  67 }  // namespace
  68
  69 ResourceDispatcher::ResourceDispatcher(
  70     IPC::Sender* sender,
  71     scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner)
  72     : message_sender_(sender),
  73       delegate_(NULL),
  74       io_timestamp_(base::TimeTicks()),
  75       main_thread_task_runner_(main_thread_task_runner),
  76       weak_factory_(this) {
  77 }
  78
  79 ResourceDispatcher::~ResourceDispatcher() {
  80 }
  81
  82 bool ResourceDispatcher::OnMessageReceived(const IPC::Message& message) {
  83   if (!IsResourceDispatcherMessage(message)) {
  84     return false;
  85   }
  86
  87   int request_id;
  88
  89   base::PickleIterator iter(message);
  90   if (!iter.ReadInt(&request_id)) {
  91     NOTREACHED() << "malformed resource message";
  92     return true;
  93   }
  94
  95   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
  96   if (!request_info) {
  97     // Release resources in the message if it is a data message.
  98     ReleaseResourcesInDataMessage(message);
  99     return true;
 100   }
 101
 102   if (request_info->is_deferred) {
 103     request_info->deferred_message_queue.push_back(new IPC::Message(message));
 104     return true;
 105   }
 106   // Make sure any deferred messages are dispatched before we dispatch more.
 107   if (!request_info->deferred_message_queue.empty()) {
 108     FlushDeferredMessages(request_id);
 109     request_info = GetPendingRequestInfo(request_id);
 110     DCHECK(request_info);
 111     if (request_info->is_deferred) {
 112       request_info->deferred_message_queue.push_back(new IPC::Message(message));
 113       return true;
 114     }
 115   }
 116
 117   DispatchMessage(message);
 118   return true;
 119 }
 120
 121 ResourceDispatcher::PendingRequestInfo*
 122 ResourceDispatcher::GetPendingRequestInfo(int request_id) {
 123   PendingRequestList::iterator it = pending_requests_.find(request_id);
 124   if (it == pending_requests_.end()) {
 125     // This might happen for kill()ed requests on the webkit end.
 126     return NULL;
 127   }
 128   return &(it->second);
 129 }
 130
 131 void ResourceDispatcher::OnUploadProgress(int request_id, int64 position,
 132                                           int64 size) {
 133   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 134   if (!request_info)
 135     return;
 136
 137   request_info->peer->OnUploadProgress(position, size);
 138
 139   // Acknowledge receipt
 140   message_sender_->Send(new ResourceHostMsg_UploadProgress_ACK(request_id));
 141 }
 142
 143 void ResourceDispatcher::OnReceivedResponse(
 144     int request_id, const ResourceResponseHead& response_head) {
 145   TRACE_EVENT0("loader", "ResourceDispatcher::OnReceivedResponse");
 146   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 147   if (!request_info)
 148     return;
 149   request_info->response_start = ConsumeIOTimestamp();
 150
 151   if (delegate_) {
 152     RequestPeer* new_peer =
 153         delegate_->OnReceivedResponse(
 154             request_info->peer, response_head.mime_type, request_info->url);
 155     if (new_peer)
 156       request_info->peer = new_peer;
 157   }
 158
 159   ResourceResponseInfo renderer_response_info;
 160   ToResourceResponseInfo(*request_info, response_head, &renderer_response_info);
 161   request_info->site_isolation_metadata =
 162       SiteIsolationStatsGatherer::OnReceivedResponse(
 163           request_info->frame_origin, request_info->response_url,
 164           request_info->resource_type, request_info->origin_pid,
 165           renderer_response_info);
 166   request_info->peer->OnReceivedResponse(renderer_response_info);
 167 }
 168
 169 void ResourceDispatcher::OnReceivedCachedMetadata(
 170       int request_id, const std::vector<char>& data) {
 171   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 172   if (!request_info)
 173     return;
 174
 175   if (data.size())
 176     request_info->peer->OnReceivedCachedMetadata(&data.front(), data.size());
 177 }
 178
 179 void ResourceDispatcher::OnSetDataBuffer(int request_id,
 180                                          base::SharedMemoryHandle shm_handle,
 181                                          int shm_size,
 182                                          base::ProcessId renderer_pid) {
 183   TRACE_EVENT0("loader", "ResourceDispatcher::OnSetDataBuffer");
 184   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 185   if (!request_info)
 186     return;
 187
 188   bool shm_valid = base::SharedMemory::IsHandleValid(shm_handle);
 189   CHECK((shm_valid && shm_size > 0) || (!shm_valid && !shm_size));
 190
 191   request_info->buffer.reset(
 192       new base::SharedMemory(shm_handle, true));  // read only
 193   request_info->received_data_factory =
 194       make_scoped_refptr(new SharedMemoryReceivedDataFactory(
 195           message_sender_, request_id, request_info->buffer));
 196
 197   bool ok = request_info->buffer->Map(shm_size);
 198   if (!ok) {
 199     // Added to help debug crbug/160401.
 200     base::ProcessId renderer_pid_copy = renderer_pid;
 201     base::debug::Alias(&renderer_pid_copy);
 202
 203     base::SharedMemoryHandle shm_handle_copy = shm_handle;
 204     base::debug::Alias(&shm_handle_copy);
 205
 206     CrashOnMapFailure();
 207     return;
 208   }
 209
 210   request_info->buffer_size = shm_size;
 211 }
 212
 213 void ResourceDispatcher::OnReceivedData(int request_id,
 214                                         int data_offset,
 215                                         int data_length,
 216                                         int encoded_data_length) {
 217   TRACE_EVENT0("loader", "ResourceDispatcher::OnReceivedData");
 218   DCHECK_GT(data_length, 0);
 219   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 220   bool send_ack = true;
 221   if (request_info && data_length > 0) {
 222     CHECK(base::SharedMemory::IsHandleValid(request_info->buffer->handle()));
 223     CHECK_GE(request_info->buffer_size, data_offset + data_length);
 224
 225     // Ensure that the SHM buffer remains valid for the duration of this scope.
 226     // It is possible for Cancel() to be called before we exit this scope.
 227     // SharedMemoryReceivedDataFactory stores the SHM buffer inside it.
 228     scoped_refptr<SharedMemoryReceivedDataFactory> factory(
 229         request_info->received_data_factory);
 230
 231     base::TimeTicks time_start = base::TimeTicks::Now();
 232
 233     const char* data_start = static_cast<char*>(request_info->buffer->memory());
 234     CHECK(data_start);
 235     CHECK(data_start + data_offset);
 236     const char* data_ptr = data_start + data_offset;
 237
 238     // Check whether this response data is compliant with our cross-site
 239     // document blocking policy. We only do this for the first chunk of data.
 240     if (request_info->site_isolation_metadata.get()) {
 241       SiteIsolationStatsGatherer::OnReceivedFirstChunk(
 242           request_info->site_isolation_metadata, data_ptr, data_length);
 243       request_info->site_isolation_metadata.reset();
 244     }
 245
 246     if (request_info->threaded_data_provider) {
 247       // A threaded data provider will take care of its own ACKing, as the data
 248       // may be processed later on another thread.
 249       send_ack = false;
 250       request_info->threaded_data_provider->OnReceivedDataOnForegroundThread(
 251           data_ptr, data_length, encoded_data_length);
 252     } else {
 253       scoped_ptr<RequestPeer::ReceivedData> data =
 254           factory->Create(data_offset, data_length, encoded_data_length);
 255       // |data| takes care of ACKing.
 256       send_ack = false;
 257       request_info->peer->OnReceivedData(data.Pass());
 258     }
 259
 260     UMA_HISTOGRAM_TIMES("ResourceDispatcher.OnReceivedDataTime",
 261                         base::TimeTicks::Now() - time_start);
 262   }
 263
 264   // Acknowledge the reception of this data.
 265   if (send_ack)
 266     message_sender_->Send(new ResourceHostMsg_DataReceived_ACK(request_id));
 267 }
 268
 269 void ResourceDispatcher::OnDownloadedData(int request_id,
 270                                           int data_len,
 271                                           int encoded_data_length) {
 272   // Acknowledge the reception of this message.
 273   message_sender_->Send(new ResourceHostMsg_DataDownloaded_ACK(request_id));
 274
 275   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 276   if (!request_info)
 277     return;
 278
 279   request_info->peer->OnDownloadedData(data_len, encoded_data_length);
 280 }
 281
 282 void ResourceDispatcher::OnReceivedRedirect(
 283     int request_id,
 284     const net::RedirectInfo& redirect_info,
 285     const ResourceResponseHead& response_head) {
 286   TRACE_EVENT0("loader", "ResourceDispatcher::OnReceivedRedirect");
 287   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 288   if (!request_info)
 289     return;
 290   request_info->response_start = ConsumeIOTimestamp();
 291
 292   ResourceResponseInfo renderer_response_info;
 293   ToResourceResponseInfo(*request_info, response_head, &renderer_response_info);
 294   if (request_info->peer->OnReceivedRedirect(redirect_info,
 295                                              renderer_response_info)) {
 296     // Double-check if the request is still around. The call above could
 297     // potentially remove it.
 298     request_info = GetPendingRequestInfo(request_id);
 299     if (!request_info)
 300       return;
 301     // We update the response_url here so that we can send it to
 302     // SiteIsolationStatsGatherer later when OnReceivedResponse is called.
 303     request_info->response_url = redirect_info.new_url;
 304     request_info->pending_redirect_message.reset(
 305         new ResourceHostMsg_FollowRedirect(request_id));
 306     if (!request_info->is_deferred) {
 307       FollowPendingRedirect(request_id, *request_info);
 308     }
 309   } else {
 310     Cancel(request_id);
 311   }
 312 }
 313
 314 void ResourceDispatcher::FollowPendingRedirect(
 315     int request_id,
 316     PendingRequestInfo& request_info) {
 317   IPC::Message* msg = request_info.pending_redirect_message.release();
 318   if (msg)
 319     message_sender_->Send(msg);
 320 }
 321
 322 void ResourceDispatcher::OnRequestComplete(
 323     int request_id,
 324     const ResourceMsg_RequestCompleteData& request_complete_data) {
 325   TRACE_EVENT0("loader", "ResourceDispatcher::OnRequestComplete");
 326
 327   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 328   if (!request_info)
 329     return;
 330   request_info->completion_time = ConsumeIOTimestamp();
 331   request_info->buffer.reset();
 332   if (request_info->received_data_factory)
 333     request_info->received_data_factory->Stop();
 334   request_info->received_data_factory = nullptr;
 335   request_info->buffer_size = 0;
 336
 337   RequestPeer* peer = request_info->peer;
 338
 339   if (delegate_) {
 340     RequestPeer* new_peer =
 341         delegate_->OnRequestComplete(
 342             request_info->peer, request_info->resource_type,
 343             request_complete_data.error_code);
 344     if (new_peer)
 345       request_info->peer = new_peer;
 346   }
 347
 348   base::TimeTicks renderer_completion_time = ToRendererCompletionTime(
 349       *request_info, request_complete_data.completion_time);
 350
 351   // If we have a threaded data provider, this message needs to bounce off the
 352   // background thread before it's returned to this thread and handled,
 353   // to make sure it's processed after all incoming data.
 354   if (request_info->threaded_data_provider) {
 355     request_info->threaded_data_provider->OnRequestCompleteForegroundThread(
 356         weak_factory_.GetWeakPtr(), request_complete_data,
 357         renderer_completion_time);
 358     return;
 359   }
 360
 361   // The request ID will be removed from our pending list in the destructor.
 362   // Normally, dispatching this message causes the reference-counted request to
 363   // die immediately.
 364   peer->OnCompletedRequest(request_complete_data.error_code,
 365                            request_complete_data.was_ignored_by_handler,
 366                            request_complete_data.exists_in_cache,
 367                            request_complete_data.security_info,
 368                            renderer_completion_time,
 369                            request_complete_data.encoded_data_length);
 370 }
 371
 372 void ResourceDispatcher::CompletedRequestAfterBackgroundThreadFlush(
 373     int request_id,
 374     const ResourceMsg_RequestCompleteData& request_complete_data,
 375     const base::TimeTicks& renderer_completion_time) {
 376   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 377   if (!request_info)
 378     return;
 379
 380   RequestPeer* peer = request_info->peer;
 381   peer->OnCompletedRequest(request_complete_data.error_code,
 382                            request_complete_data.was_ignored_by_handler,
 383                            request_complete_data.exists_in_cache,
 384                            request_complete_data.security_info,
 385                            renderer_completion_time,
 386                            request_complete_data.encoded_data_length);
 387 }
 388
 389 bool ResourceDispatcher::RemovePendingRequest(int request_id) {
 390   PendingRequestList::iterator it = pending_requests_.find(request_id);
 391   if (it == pending_requests_.end())
 392     return false;
 393
 394   PendingRequestInfo& request_info = it->second;
 395
 396   bool release_downloaded_file = request_info.download_to_file;
 397
 398   ReleaseResourcesInMessageQueue(&request_info.deferred_message_queue);
 399   pending_requests_.erase(it);
 400
 401   if (release_downloaded_file) {
 402     message_sender_->Send(
 403         new ResourceHostMsg_ReleaseDownloadedFile(request_id));
 404   }
 405
 406   return true;
 407 }
 408
 409 void ResourceDispatcher::Cancel(int request_id) {
 410   PendingRequestList::iterator it = pending_requests_.find(request_id);
 411   if (it == pending_requests_.end()) {
 412     DVLOG(1) << "unknown request";
 413     return;
 414   }
 415
 416   // Cancel the request, and clean it up so the bridge will receive no more
 417   // messages.
 418   message_sender_->Send(new ResourceHostMsg_CancelRequest(request_id));
 419   RemovePendingRequest(request_id);
 420 }
 421
 422 void ResourceDispatcher::SetDefersLoading(int request_id, bool value) {
 423   PendingRequestList::iterator it = pending_requests_.find(request_id);
 424   if (it == pending_requests_.end()) {
 425     DLOG(ERROR) << "unknown request";
 426     return;
 427   }
 428   PendingRequestInfo& request_info = it->second;
 429   if (value) {
 430     request_info.is_deferred = value;
 431   } else if (request_info.is_deferred) {
 432     request_info.is_deferred = false;
 433
 434     FollowPendingRedirect(request_id, request_info);
 435
 436     main_thread_task_runner_->PostTask(
 437         FROM_HERE, base::Bind(&ResourceDispatcher::FlushDeferredMessages,
 438                               weak_factory_.GetWeakPtr(), request_id));
 439   }
 440 }
 441
 442 void ResourceDispatcher::DidChangePriority(int request_id,
 443                                            net::RequestPriority new_priority,
 444                                            int intra_priority_value) {
 445   DCHECK(ContainsKey(pending_requests_, request_id));
 446   message_sender_->Send(new ResourceHostMsg_DidChangePriority(
 447       request_id, new_priority, intra_priority_value));
 448 }
 449
 450 bool ResourceDispatcher::AttachThreadedDataReceiver(
 451     int request_id, blink::WebThreadedDataReceiver* threaded_data_receiver) {
 452   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 453   DCHECK(request_info);
 454
 455   if (request_info->buffer != NULL) {
 456     DCHECK(!request_info->threaded_data_provider);
 457     request_info->threaded_data_provider = new ThreadedDataProvider(
 458         request_id, threaded_data_receiver, request_info->buffer,
 459         request_info->buffer_size, main_thread_task_runner_);
 460     return true;
 461   }
 462
 463   return false;
 464 }
 465
 466 ResourceDispatcher::PendingRequestInfo::PendingRequestInfo()
 467     : peer(NULL),
 468       threaded_data_provider(NULL),
 469       resource_type(RESOURCE_TYPE_SUB_RESOURCE),
 470       is_deferred(false),
 471       download_to_file(false),
 472       buffer_size(0) {
 473 }
 474
 475 ResourceDispatcher::PendingRequestInfo::PendingRequestInfo(
 476     RequestPeer* peer,
 477     ResourceType resource_type,
 478     int origin_pid,
 479     const GURL& frame_origin,
 480     const GURL& request_url,
 481     bool download_to_file)
 482     : peer(peer),
 483       threaded_data_provider(NULL),
 484       resource_type(resource_type),
 485       origin_pid(origin_pid),
 486       is_deferred(false),
 487       url(request_url),
 488       frame_origin(frame_origin),
 489       response_url(request_url),
 490       download_to_file(download_to_file),
 491       request_start(base::TimeTicks::Now()) {
 492 }
 493
 494 ResourceDispatcher::PendingRequestInfo::~PendingRequestInfo() {
 495   if (threaded_data_provider)
 496     threaded_data_provider->Stop();
 497 }
 498
 499 void ResourceDispatcher::DispatchMessage(const IPC::Message& message) {
 500   IPC_BEGIN_MESSAGE_MAP(ResourceDispatcher, message)
 501     IPC_MESSAGE_HANDLER(ResourceMsg_UploadProgress, OnUploadProgress)
 502     IPC_MESSAGE_HANDLER(ResourceMsg_ReceivedResponse, OnReceivedResponse)
 503     IPC_MESSAGE_HANDLER(ResourceMsg_ReceivedCachedMetadata,
 504                         OnReceivedCachedMetadata)
 505     IPC_MESSAGE_HANDLER(ResourceMsg_ReceivedRedirect, OnReceivedRedirect)
 506     IPC_MESSAGE_HANDLER(ResourceMsg_SetDataBuffer, OnSetDataBuffer)
 507     IPC_MESSAGE_HANDLER(ResourceMsg_DataReceived, OnReceivedData)
 508     IPC_MESSAGE_HANDLER(ResourceMsg_DataDownloaded, OnDownloadedData)
 509     IPC_MESSAGE_HANDLER(ResourceMsg_RequestComplete, OnRequestComplete)
 510   IPC_END_MESSAGE_MAP()
 511 }
 512
 513 void ResourceDispatcher::FlushDeferredMessages(int request_id) {
 514   PendingRequestList::iterator it = pending_requests_.find(request_id);
 515   if (it == pending_requests_.end())  // The request could have become invalid.
 516     return;
 517   PendingRequestInfo& request_info = it->second;
 518   if (request_info.is_deferred)
 519     return;
 520   // Because message handlers could result in request_info being destroyed,
 521   // we need to work with a stack reference to the deferred queue.
 522   MessageQueue q;
 523   q.swap(request_info.deferred_message_queue);
 524   while (!q.empty()) {
 525     IPC::Message* m = q.front();
 526     q.pop_front();
 527     DispatchMessage(*m);
 528     delete m;
 529     // If this request is deferred in the context of the above message, then
 530     // we should honor the same and stop dispatching further messages.
 531     // We need to find the request again in the list as it may have completed
 532     // by now and the request_info instance above may be invalid.
 533     PendingRequestList::iterator index = pending_requests_.find(request_id);
 534     if (index != pending_requests_.end()) {
 535       PendingRequestInfo& pending_request = index->second;
 536       if (pending_request.is_deferred) {
 537         pending_request.deferred_message_queue.swap(q);
 538         return;
 539       }
 540     }
 541   }
 542 }
 543
 544 void ResourceDispatcher::StartSync(const RequestInfo& request_info,
 545                                    ResourceRequestBody* request_body,
 546                                    SyncLoadResponse* response) {
 547   scoped_ptr<ResourceHostMsg_Request> request =
 548       CreateRequest(request_info, request_body, NULL);
 549
 550   SyncLoadResult result;
 551   IPC::SyncMessage* msg = new ResourceHostMsg_SyncLoad(
 552       request_info.routing_id, MakeRequestID(), *request, &result);
 553
 554   // NOTE: This may pump events (see RenderThread::Send).
 555   if (!message_sender_->Send(msg)) {
 556     response->error_code = net::ERR_FAILED;
 557     return;
 558   }
 559
 560   response->error_code = result.error_code;
 561   response->url = result.final_url;
 562   response->headers = result.headers;
 563   response->mime_type = result.mime_type;
 564   response->charset = result.charset;
 565   response->request_time = result.request_time;
 566   response->response_time = result.response_time;
 567   response->encoded_data_length = result.encoded_data_length;
 568   response->load_timing = result.load_timing;
 569   response->devtools_info = result.devtools_info;
 570   response->data.swap(result.data);
 571   response->download_file_path = result.download_file_path;
 572 }
 573
 574 int ResourceDispatcher::StartAsync(const RequestInfo& request_info,
 575                                    ResourceRequestBody* request_body,
 576                                    RequestPeer* peer) {
 577   GURL frame_origin;
 578   scoped_ptr<ResourceHostMsg_Request> request =
 579       CreateRequest(request_info, request_body, &frame_origin);
 580
 581   // Compute a unique request_id for this renderer process.
 582   int request_id = MakeRequestID();
 583   pending_requests_[request_id] =
 584       PendingRequestInfo(peer,
 585                          request->resource_type,
 586                          request->origin_pid,
 587                          frame_origin,
 588                          request->url,
 589                          request_info.download_to_file);
 590
 591   message_sender_->Send(new ResourceHostMsg_RequestResource(
 592       request_info.routing_id, request_id, *request));
 593
 594   return request_id;
 595 }
 596
 597 void ResourceDispatcher::ToResourceResponseInfo(
 598     const PendingRequestInfo& request_info,
 599     const ResourceResponseHead& browser_info,
 600     ResourceResponseInfo* renderer_info) const {
 601   *renderer_info = browser_info;
 602   if (request_info.request_start.is_null() ||
 603       request_info.response_start.is_null() ||
 604       browser_info.request_start.is_null() ||
 605       browser_info.response_start.is_null() ||
 606       browser_info.load_timing.request_start.is_null()) {
 607     return;
 608   }
 609   InterProcessTimeTicksConverter converter(
 610       LocalTimeTicks::FromTimeTicks(request_info.request_start),
 611       LocalTimeTicks::FromTimeTicks(request_info.response_start),
 612       RemoteTimeTicks::FromTimeTicks(browser_info.request_start),
 613       RemoteTimeTicks::FromTimeTicks(browser_info.response_start));
 614
 615   net::LoadTimingInfo* load_timing = &renderer_info->load_timing;
 616   RemoteToLocalTimeTicks(converter, &load_timing->request_start);
 617   RemoteToLocalTimeTicks(converter, &load_timing->proxy_resolve_start);
 618   RemoteToLocalTimeTicks(converter, &load_timing->proxy_resolve_end);
 619   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.dns_start);
 620   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.dns_end);
 621   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.connect_start);
 622   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.connect_end);
 623   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.ssl_start);
 624   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.ssl_end);
 625   RemoteToLocalTimeTicks(converter, &load_timing->send_start);
 626   RemoteToLocalTimeTicks(converter, &load_timing->send_end);
 627   RemoteToLocalTimeTicks(converter, &load_timing->receive_headers_end);
 628   RemoteToLocalTimeTicks(converter, &renderer_info->service_worker_start_time);
 629   RemoteToLocalTimeTicks(converter, &renderer_info->service_worker_ready_time);
 630
 631   // Collect UMA on the inter-process skew.
 632   bool is_skew_additive = false;
 633   if (converter.IsSkewAdditiveForMetrics()) {
 634     is_skew_additive = true;
 635     base::TimeDelta skew = converter.GetSkewForMetrics();
 636     if (skew >= base::TimeDelta()) {
 637       UMA_HISTOGRAM_TIMES(
 638           "InterProcessTimeTicks.BrowserAhead_BrowserToRenderer", skew);
 639     } else {
 640       UMA_HISTOGRAM_TIMES(
 641           "InterProcessTimeTicks.BrowserBehind_BrowserToRenderer", -skew);
 642     }
 643   }
 644   UMA_HISTOGRAM_BOOLEAN(
 645       "InterProcessTimeTicks.IsSkewAdditive_BrowserToRenderer",
 646       is_skew_additive);
 647 }
 648
 649 base::TimeTicks ResourceDispatcher::ToRendererCompletionTime(
 650     const PendingRequestInfo& request_info,
 651     const base::TimeTicks& browser_completion_time) const {
 652   if (request_info.completion_time.is_null()) {
 653     return browser_completion_time;
 654   }
 655
 656   // TODO(simonjam): The optimal lower bound should be the most recent value of
 657   // TimeTicks::Now() returned to WebKit. Is it worth trying to cache that?
 658   // Until then, |response_start| is used as it is the most recent value
 659   // returned for this request.
 660   int64 result = std::max(browser_completion_time.ToInternalValue(),
 661                           request_info.response_start.ToInternalValue());
 662   result = std::min(result, request_info.completion_time.ToInternalValue());
 663   return base::TimeTicks::FromInternalValue(result);
 664 }
 665
 666 base::TimeTicks ResourceDispatcher::ConsumeIOTimestamp() {
 667   if (io_timestamp_ == base::TimeTicks())
 668     return base::TimeTicks::Now();
 669   base::TimeTicks result = io_timestamp_;
 670   io_timestamp_ = base::TimeTicks();
 671   return result;
 672 }
 673
 674 // static
 675 bool ResourceDispatcher::IsResourceDispatcherMessage(
 676     const IPC::Message& message) {
 677   switch (message.type()) {
 678     case ResourceMsg_UploadProgress::ID:
 679     case ResourceMsg_ReceivedResponse::ID:
 680     case ResourceMsg_ReceivedCachedMetadata::ID:
 681     case ResourceMsg_ReceivedRedirect::ID:
 682     case ResourceMsg_SetDataBuffer::ID:
 683     case ResourceMsg_DataReceived::ID:
 684     case ResourceMsg_DataDownloaded::ID:
 685     case ResourceMsg_RequestComplete::ID:
 686       return true;
 687
 688     default:
 689       break;
 690   }
 691
 692   return false;
 693 }
 694
 695 // static
 696 void ResourceDispatcher::ReleaseResourcesInDataMessage(
 697     const IPC::Message& message) {
 698   base::PickleIterator iter(message);
 699   int request_id;
 700   if (!iter.ReadInt(&request_id)) {
 701     NOTREACHED() << "malformed resource message";
 702     return;
 703   }
 704
 705   // If the message contains a shared memory handle, we should close the handle
 706   // or there will be a memory leak.
 707   if (message.type() == ResourceMsg_SetDataBuffer::ID) {
 708     base::SharedMemoryHandle shm_handle;
 709     if (IPC::ParamTraits<base::SharedMemoryHandle>::Read(&message,
 710                                                          &iter,
 711                                                          &shm_handle)) {
 712       if (base::SharedMemory::IsHandleValid(shm_handle))
 713         base::SharedMemory::CloseHandle(shm_handle);
 714     }
 715   }
 716 }
 717
 718 // static
 719 void ResourceDispatcher::ReleaseResourcesInMessageQueue(MessageQueue* queue) {
 720   while (!queue->empty()) {
 721     IPC::Message* message = queue->front();
 722     ReleaseResourcesInDataMessage(*message);
 723     queue->pop_front();
 724     delete message;
 725   }
 726 }
 727
 728 scoped_ptr<ResourceHostMsg_Request> ResourceDispatcher::CreateRequest(
 729     const RequestInfo& request_info,
 730     ResourceRequestBody* request_body,
 731     GURL* frame_origin) {
 732   scoped_ptr<ResourceHostMsg_Request> request(new ResourceHostMsg_Request);
 733   request->method = request_info.method;
 734   request->url = request_info.url;
 735   request->first_party_for_cookies = request_info.first_party_for_cookies;
 736   request->referrer = request_info.referrer.url;
 737   request->referrer_policy = request_info.referrer.policy;
 738   request->headers = request_info.headers;
 739   request->load_flags = request_info.load_flags;
 740   request->origin_pid = request_info.requestor_pid;
 741   request->resource_type = request_info.request_type;
 742   request->priority = request_info.priority;
 743   request->request_context = request_info.request_context;
 744   request->appcache_host_id = request_info.appcache_host_id;
 745   request->download_to_file = request_info.download_to_file;
 746   request->has_user_gesture = request_info.has_user_gesture;
 747   request->skip_service_worker = request_info.skip_service_worker;
 748   request->should_reset_appcache = request_info.should_reset_appcache;
 749   request->fetch_request_mode = request_info.fetch_request_mode;
 750   request->fetch_credentials_mode = request_info.fetch_credentials_mode;
 751   request->fetch_redirect_mode = request_info.fetch_redirect_mode;
 752   request->fetch_request_context_type = request_info.fetch_request_context_type;
 753   request->fetch_frame_type = request_info.fetch_frame_type;
 754   request->enable_load_timing = request_info.enable_load_timing;
 755   request->enable_upload_progress = request_info.enable_upload_progress;
 756   request->do_not_prompt_for_login = request_info.do_not_prompt_for_login;
 757   request->report_raw_headers = request_info.report_raw_headers;
 758
 759   if ((request_info.referrer.policy == blink::WebReferrerPolicyDefault ||
 760        request_info.referrer.policy ==
 761            blink::WebReferrerPolicyNoReferrerWhenDowngrade) &&
 762       request_info.referrer.url.SchemeIsCryptographic() &&
 763       !request_info.url.SchemeIsCryptographic()) {
 764     LOG(FATAL) << "Trying to send secure referrer for insecure request "
 765                << "without an appropriate referrer policy.\n"
 766                << "URL = " << request_info.url << "\n"
 767                << "Referrer = " << request_info.referrer.url;
 768   }
 769
 770   const RequestExtraData kEmptyData;
 771   const RequestExtraData* extra_data;
 772   if (request_info.extra_data)
 773     extra_data = static_cast<RequestExtraData*>(request_info.extra_data);
 774   else
 775     extra_data = &kEmptyData;
 776   request->visiblity_state = extra_data->visibility_state();
 777   request->render_frame_id = extra_data->render_frame_id();
 778   request->is_main_frame = extra_data->is_main_frame();
 779   request->parent_is_main_frame = extra_data->parent_is_main_frame();
 780   request->parent_render_frame_id = extra_data->parent_render_frame_id();
 781   request->allow_download = extra_data->allow_download();
 782   request->transition_type = extra_data->transition_type();
 783   request->should_replace_current_entry =
 784       extra_data->should_replace_current_entry();
 785   request->transferred_request_child_id =
 786       extra_data->transferred_request_child_id();
 787   request->transferred_request_request_id =
 788       extra_data->transferred_request_request_id();
 789   request->service_worker_provider_id =
 790       extra_data->service_worker_provider_id();
 791   request->request_body = request_body;
 792   if (frame_origin)
 793     *frame_origin = extra_data->frame_origin();
 794   return request.Pass();
 795 }
 796
 797 }  // namespace content