[Cross-Site Isolation] Migrate entire MediaStream verticals to be per-RenderFrame.

content/browser/renderer_host/media/media_stream_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 
 #include <list>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 165 matching lines @@
 // MediaStreamManager::DeviceRequest represents a request to either enumerate
 // available devices or open one or more devices.
 // TODO(perkj): MediaStreamManager still needs refactoring. I propose we create
 // several subclasses of DeviceRequest and move some of the responsibility of
 // the MediaStreamManager to the subclasses to get rid of the way too many if
 // statements in MediaStreamManager.
 class MediaStreamManager::DeviceRequest {
  public:
   DeviceRequest(MediaStreamRequester* requester,
                 int requesting_process_id,
-                int requesting_view_id,
+                int requesting_frame_id,
                 int page_request_id,
                 const GURL& security_origin,
                 bool have_permission,
                 bool user_gesture,
                 MediaStreamRequestType request_type,
                 const StreamOptions& options,
                 const ResourceContext::SaltCallback& salt_callback)
       : requester(requester),
         requesting_process_id(requesting_process_id),
-        requesting_view_id(requesting_view_id),
+        requesting_frame_id(requesting_frame_id),
         page_request_id(page_request_id),
         security_origin(security_origin),
         have_permission(have_permission),
         user_gesture(user_gesture),
         request_type(request_type),
         options(options),
         salt_callback(salt_callback),
         state_(NUM_MEDIA_TYPES, MEDIA_REQUEST_STATE_NOT_REQUESTED),
         audio_type_(MEDIA_NO_SERVICE),
         video_type_(MEDIA_NO_SERVICE) {
@@ skipping 16 matching lines @@
   }
 
   MediaStreamType video_type() const { return video_type_; }
 
   // Creates a MediaStreamRequest object that is used by this request when UI
   // is asked for permission and device selection.
   void CreateUIRequest(const std::string& requested_audio_device_id,
                        const std::string& requested_video_device_id) {
     DCHECK(!ui_request_);
     ui_request_.reset(new MediaStreamRequest(requesting_process_id,
-                                             requesting_view_id,
+                                             requesting_frame_id,
                                              page_request_id,
                                              security_origin,
                                              user_gesture,
                                              request_type,
                                              requested_audio_device_id,
                                              requested_video_device_id,
                                              audio_type_,
                                              video_type_));
   }
 
   // Creates a tab capture specific MediaStreamRequest object that is used by
   // this request when UI is asked for permission and device selection.
-  void CreateTabCatureUIRequest(int target_render_process_id,
-                                int target_render_view_id,
-                                const std::string& tab_capture_id) {
+  void CreateTabCaptureUIRequest(int target_render_process_id,
+                                 int target_render_frame_id,
+                                 const std::string& tab_capture_id) {
     DCHECK(!ui_request_);
     ui_request_.reset(new MediaStreamRequest(target_render_process_id,
-                                             target_render_view_id,
+                                             target_render_frame_id,
                                              page_request_id,
                                              security_origin,
                                              user_gesture,
                                              request_type,
                                              "",
                                              "",
                                              audio_type_,
                                              video_type_));
     ui_request_->tab_capture_device_id = tab_capture_id;
   }
@@ skipping 14 matching lines @@
     MediaObserver* media_observer =
         GetContentClient()->browser()->GetMediaObserver();
     if (!media_observer)
       return;
 
     // If |ui_request_| doesn't exist, it means that the request has not yet
     // been setup fully and there are no valid observers.
     if (!ui_request_)
       return;
 
-    // If we appended a device_id scheme, we want to remove it when notifying
-    // observers which may be in different modules since this scheme is only
-    // used internally within the content module.
-    std::string device_id =
-        WebContentsCaptureUtil::StripWebContentsDeviceScheme(
-            ui_request_->tab_capture_device_id);
-
     media_observer->OnMediaRequestStateChanged(
-        ui_request_->render_process_id, ui_request_->render_view_id,
+        ui_request_->render_process_id, ui_request_->render_frame_id,
         ui_request_->page_request_id, ui_request_->security_origin,
-        MediaStreamDevice(stream_type, device_id, device_id), new_state);
+        stream_type, new_state);
   }
 
   MediaRequestState state(MediaStreamType stream_type) const {
     return state_[stream_type];
   }
 
   MediaStreamRequester* const requester;  // Can be NULL.
 
 
   // The render process id that requested this stream to be generated and that
   // will receive a handle to the MediaStream. This may be different from
   // MediaStreamRequest::render_process_id which in the tab capture case
   // specifies the target renderer from which audio and video is captured.
   const int requesting_process_id;
 
-  // The render view id that requested this stream to be generated and that
+  // The render frame id that requested this stream to be generated and that
   // will receive a handle to the MediaStream. This may be different from
-  // MediaStreamRequest::render_view_id which in the tab capture case
+  // MediaStreamRequest::render_frame_id which in the tab capture case
   // specifies the target renderer from which audio and video is captured.
-  const int requesting_view_id;
+  const int requesting_frame_id;
 
-  // An ID the render view provided to identify this request.
+  // An ID the render frame provided to identify this request.
   const int page_request_id;
 
   const GURL security_origin;
 
   // This is used when enumerating devices; if we don't have device access
   // permission, we remove the device label.
   bool have_permission;
 
   const bool user_gesture;
 
@@ skipping 78 matching lines @@
 }
 
 AudioInputDeviceManager* MediaStreamManager::audio_input_device_manager() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK(audio_input_device_manager_.get());
   return audio_input_device_manager_.get();
 }
 
 std::string MediaStreamManager::MakeMediaAccessRequest(
     int render_process_id,
-    int render_view_id,
+    int render_frame_id,
     int page_request_id,
     const StreamOptions& options,
     const GURL& security_origin,
     const MediaRequestResponseCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   // TODO(perkj): The argument list with NULL parameters to DeviceRequest
   // suggests that this is the wrong design. Can this be refactored?
   DeviceRequest* request = new DeviceRequest(NULL,
                                              render_process_id,
-                                             render_view_id,
+                                             render_frame_id,
                                              page_request_id,
                                              security_origin,
                                              true,
                                              false,  // user gesture
                                              MEDIA_DEVICE_ACCESS,
                                              options,
                                              base::Bind(&ReturnEmptySalt));
 
   const std::string& label = AddRequest(request);
 
   request->callback = callback;
   // Post a task and handle the request asynchronously. The reason is that the
   // requester won't have a label for the request until this function returns
   // and thus can not handle a response. Using base::Unretained is safe since
   // MediaStreamManager is deleted on the UI thread, after the IO thread has
   // been stopped.
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&MediaStreamManager::SetupRequest,
                  base::Unretained(this), label));
   return label;
 }
 
 void MediaStreamManager::GenerateStream(MediaStreamRequester* requester,
                                         int render_process_id,
-                                        int render_view_id,
+                                        int render_frame_id,
                                         const ResourceContext::SaltCallback& sc,
                                         int page_request_id,
                                         const StreamOptions& options,
                                         const GURL& security_origin,
                                         bool user_gesture) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DVLOG(1) << "GenerateStream()";
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kUseFakeUIForMediaStream)) {
     UseFakeUI(scoped_ptr<FakeMediaStreamUIProxy>());
   }
 
   DeviceRequest* request = new DeviceRequest(requester,
                                              render_process_id,
-                                             render_view_id,
+                                             render_frame_id,
                                              page_request_id,
                                              security_origin,
                                              true,
                                              user_gesture,
                                              MEDIA_GENERATE_STREAM,
                                              options,
                                              sc);
 
   const std::string& label = AddRequest(request);
 
   // Post a task and handle the request asynchronously. The reason is that the
   // requester won't have a label for the request until this function returns
   // and thus can not handle a response. Using base::Unretained is safe since
   // MediaStreamManager is deleted on the UI thread, after the IO thread has
   // been stopped.
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&MediaStreamManager::SetupRequest,
                  base::Unretained(this), label));
 }
 
 void MediaStreamManager::CancelRequest(int render_process_id,
-                                       int render_view_id,
+                                       int render_frame_id,
                                        int page_request_id) {
   for (DeviceRequests::const_iterator request_it = requests_.begin();
        request_it != requests_.end(); ++request_it) {
     const DeviceRequest* request = request_it->second;
     if (request->requesting_process_id == render_process_id &&
-        request->requesting_view_id == render_view_id &&
+        request->requesting_frame_id == render_frame_id &&
         request->page_request_id == page_request_id) {
       CancelRequest(request_it->first);
       return;
     }
   }
   NOTREACHED();
 }
 
 void MediaStreamManager::CancelRequest(const std::string& label) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
@@ skipping 41 matching lines @@
       continue;
     }
 
     std::string label = request_it->first;
     ++request_it;
     CancelRequest(label);
   }
 }
 
 void MediaStreamManager::StopStreamDevice(int render_process_id,
-                                          int render_view_id,
+                                          int render_frame_id,
                                           const std::string& device_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
-  DVLOG(1) << "StopStreamDevice({render_view_id = " << render_view_id <<  "} "
+  DVLOG(1) << "StopStreamDevice({render_frame_id = " << render_frame_id <<  "} "
            << ", {device_id = " << device_id << "})";
-  // Find the first request for this |render_process_id| and |render_view_id|
+  // Find the first request for this |render_process_id| and |render_frame_id|
   // of type MEDIA_GENERATE_STREAM that has requested to use |device_id| and
   // stop it.
   for (DeviceRequests::iterator request_it = requests_.begin();
-       request_it  != requests_.end(); ++request_it) {
+       request_it != requests_.end(); ++request_it) {
     DeviceRequest* request = request_it->second;
     if (request->requesting_process_id != render_process_id ||
-        request->requesting_view_id != render_view_id ||
+        request->requesting_frame_id != render_frame_id ||
         request->request_type != MEDIA_GENERATE_STREAM) {
       continue;
     }
 
     StreamDeviceInfoArray& devices = request->devices;
     for (StreamDeviceInfoArray::iterator device_it = devices.begin();
          device_it != devices.end(); ++device_it) {
       if (device_it->device.id == device_id) {
         StopDevice(device_it->device.type, device_it->session_id);
         return;
@@ skipping 58 matching lines @@
         // Note that only one device per type can be opened.
         request_it->second->SetState(type, MEDIA_REQUEST_STATE_CLOSING);
       }
     }
   }
 }
 
 std::string MediaStreamManager::EnumerateDevices(
     MediaStreamRequester* requester,
     int render_process_id,
-    int render_view_id,
+    int render_frame_id,
     const ResourceContext::SaltCallback& sc,
     int page_request_id,
     MediaStreamType type,
     const GURL& security_origin,
     bool have_permission) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK(requester);
   DCHECK(type == MEDIA_DEVICE_AUDIO_CAPTURE ||
          type == MEDIA_DEVICE_VIDEO_CAPTURE ||
          type == MEDIA_DEVICE_AUDIO_OUTPUT);
 
   DeviceRequest* request = new DeviceRequest(requester,
                                              render_process_id,
-                                             render_view_id,
+                                             render_frame_id,
                                              page_request_id,
                                              security_origin,
                                              have_permission,
                                              false,  // user gesture
                                              MEDIA_ENUMERATE_DEVICES,
                                              StreamOptions(),
                                              sc);
   if (IsAudioInputMediaType(type) || type == MEDIA_DEVICE_AUDIO_OUTPUT)
     request->SetAudioType(type);
   else if (IsVideoMediaType(type))
@@ skipping 50 matching lines @@
     // Cached device list of this type exists. Just send it out.
     request->SetState(type, MEDIA_REQUEST_STATE_REQUESTED);
     request->devices = cache->devices;
     FinalizeEnumerateDevices(label, request);
   } else {
     StartEnumeration(request);
   }
   DVLOG(1) << "Enumerate Devices ({label = " << label <<  "})";
 }
 
-void MediaStreamManager::EnumerateAudioOutputDevices(
-    const std::string& label) {
+void MediaStreamManager::EnumerateAudioOutputDevices(const std::string& label) {
   DCHECK(device_task_runner_->BelongsToCurrentThread());
 
   scoped_ptr<media::AudioDeviceNames> device_names(
       new media::AudioDeviceNames());
   audio_manager_->GetAudioOutputDeviceNames(device_names.get());
   StreamDeviceInfoArray devices;
   for (media::AudioDeviceNames::iterator it = device_names->begin();
        it != device_names->end(); ++it) {
     StreamDeviceInfo device(MEDIA_DEVICE_AUDIO_OUTPUT,
                             it->device_name,
@@ skipping 31 matching lines @@
       FinalizeEnumerateDevices(it->first, it->second);
     }
   }
 
   --active_enumeration_ref_count_[MEDIA_DEVICE_AUDIO_OUTPUT];
   DCHECK_GE(active_enumeration_ref_count_[MEDIA_DEVICE_AUDIO_OUTPUT], 0);
 }
 
 void MediaStreamManager::OpenDevice(MediaStreamRequester* requester,
                                     int render_process_id,
-                                    int render_view_id,
+                                    int render_frame_id,
                                     const ResourceContext::SaltCallback& sc,
                                     int page_request_id,
                                     const std::string& device_id,
                                     MediaStreamType type,
                                     const GURL& security_origin) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK(type == MEDIA_DEVICE_AUDIO_CAPTURE ||
          type == MEDIA_DEVICE_VIDEO_CAPTURE);
   DVLOG(1) << "OpenDevice ({page_request_id = " << page_request_id <<  "})";
   StreamOptions options;
   if (IsAudioInputMediaType(type)) {
     options.audio_requested = true;
     options.mandatory_audio.push_back(
         StreamOptions::Constraint(kMediaStreamSourceInfoId, device_id));
   } else if (IsVideoMediaType(type)) {
     options.video_requested = true;
     options.mandatory_video.push_back(
         StreamOptions::Constraint(kMediaStreamSourceInfoId, device_id));
   } else {
     NOTREACHED();
   }
   DeviceRequest* request = new DeviceRequest(requester,
                                              render_process_id,
-                                             render_view_id,
+                                             render_frame_id,
                                              page_request_id,
                                              security_origin,
                                              true,
                                              false,  // user gesture
                                              MEDIA_OPEN_DEVICE,
                                              options,
                                              sc);
 
   const std::string& label = AddRequest(request);
   // Post a task and handle the request asynchronously. The reason is that the
@@ skipping 79 matching lines @@
          device_it != request->devices.end(); ++device_it) {
       std::string source_id = content::GetHMACForMediaDeviceID(
           request->salt_callback,
           request->security_origin,
           device.id);
       if (device_it->device.id == source_id &&
           device_it->device.type == device.type) {
         session_ids.push_back(device_it->session_id);
         if (it->second->requester) {
           it->second->requester->DeviceStopped(
-              it->second->requesting_view_id,
+              it->second->requesting_frame_id,
               it->first,
               *device_it);
         }
       }
     }
   }
   for (std::vector<int>::const_iterator it = session_ids.begin();
        it != session_ids.end(); ++it) {
     StopDevice(device.type, *it);
   }
@@ skipping 364 matching lines @@
                                                       &mandatory_audio) &&
       !request->options.GetFirstVideoConstraintByName(kMediaStreamSourceId,
                                                       &capture_device_id,
                                                       &mandatory_video)) {
     return false;
   }
   DCHECK(mandatory_audio || mandatory_video);
 
   // Customize options for a WebContents based capture.
   int target_render_process_id = 0;
-  int target_render_view_id = 0;
-
-  // TODO(justinlin): Can't plumb audio mirroring using stream type right
-  // now, so plumbing by device_id. Will revisit once it's refactored.
-  // http://crbug.com/163100
-  std::string tab_capture_device_id =
-      WebContentsCaptureUtil::AppendWebContentsDeviceScheme(capture_device_id);
+  int target_render_frame_id = 0;
 
   bool has_valid_device_id = WebContentsCaptureUtil::ExtractTabCaptureTarget(
-      tab_capture_device_id, &target_render_process_id,
-      &target_render_view_id);
+      capture_device_id, &target_render_process_id, &target_render_frame_id);
   if (!has_valid_device_id ||
       (request->audio_type() != MEDIA_TAB_AUDIO_CAPTURE &&
        request->audio_type() != MEDIA_NO_SERVICE) ||
       (request->video_type() != MEDIA_TAB_VIDEO_CAPTURE &&
        request->video_type() != MEDIA_NO_SERVICE)) {
     return false;
   }
 
-  request->CreateTabCatureUIRequest(target_render_process_id,
-                                    target_render_view_id,
-                                    tab_capture_device_id);
+  request->CreateTabCaptureUIRequest(target_render_process_id,
+                                     target_render_frame_id,
+                                     capture_device_id);
 
   DVLOG(3) << "SetupTabCaptureRequest "
-           << ", {tab_capture_device_id = " << tab_capture_device_id <<  "}"
+           << ", {capture_device_id = " << capture_device_id <<  "}"
            << ", {target_render_process_id = " << target_render_process_id
            << "}"
-           << ", {target_render_view_id = " << target_render_view_id << "}";
+           << ", {target_render_frame_id = " << target_render_frame_id << "}";
   return true;
 }
 
 bool MediaStreamManager::SetupScreenCaptureRequest(DeviceRequest* request) {
   DCHECK(request->audio_type() == MEDIA_LOOPBACK_AUDIO_CAPTURE ||
          request->video_type() == MEDIA_DESKTOP_VIDEO_CAPTURE);
 
   // For screen capture we only support two valid combinations:
   // (1) screen video capture only, or
   // (2) screen video capture with loopback audio capture.
@@ skipping 51 matching lines @@
 
   std::string source_id = content::GetHMACForMediaDeviceID(
       new_request.salt_callback,
       new_request.security_origin,
       new_device_info.id);
 
   for (DeviceRequests::const_iterator it = requests_.begin();
        it != requests_.end() ; ++it) {
     const DeviceRequest* request = it->second;
     if (request->requesting_process_id == new_request.requesting_process_id &&
-        request->requesting_view_id == new_request.requesting_view_id &&
+        request->requesting_frame_id == new_request.requesting_frame_id &&
         request->request_type == new_request.request_type) {
       for (StreamDeviceInfoArray::const_iterator device_it =
                request->devices.begin();
            device_it != request->devices.end(); ++device_it) {
         if (device_it->device.id == source_id &&
             device_it->device.type == new_device_info.type) {
             *existing_device_info = *device_it;
             *existing_request_state = request->state(device_it->device.type);
           return true;
         }
@@ skipping 16 matching lines @@
     if (IsAudioInputMediaType(device_it->device.type)) {
       audio_devices.push_back(*device_it);
     } else if (IsVideoMediaType(device_it->device.type)) {
       video_devices.push_back(*device_it);
     } else {
       NOTREACHED();
     }
   }
 
   request->requester->StreamGenerated(
-      request->requesting_view_id,
+      request->requesting_frame_id,
       request->page_request_id,
       label, audio_devices, video_devices);
 }
 
 void MediaStreamManager::FinalizeRequestFailed(
     const std::string& label,
     DeviceRequest* request,
     content::MediaStreamRequestResult result) {
   if (request->requester)
     request->requester->StreamGenerationFailed(
-        request->requesting_view_id,
+        request->requesting_frame_id,
         request->page_request_id,
         result);
 
   if (request->request_type == MEDIA_DEVICE_ACCESS &&
       !request->callback.is_null()) {
     request->callback.Run(MediaStreamDevices(), request->ui_proxy.Pass());
   }
 
   DeleteRequest(label);
 }
 
 void MediaStreamManager::FinalizeOpenDevice(const std::string& label,
                                             DeviceRequest* request) {
   const StreamDeviceInfoArray& requested_devices = request->devices;
-  request->requester->DeviceOpened(request->requesting_view_id,
+  request->requester->DeviceOpened(request->requesting_frame_id,
                                    request->page_request_id,
                                    label, requested_devices.front());
 }
 
 void MediaStreamManager::FinalizeEnumerateDevices(const std::string& label,
                                                   DeviceRequest* request) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK_EQ(request->request_type, MEDIA_ENUMERATE_DEVICES);
 
   if (request->security_origin.is_valid()) {
     for (StreamDeviceInfoArray::iterator it = request->devices.begin();
          it != request->devices.end(); ++it) {
       TranslateDeviceIdToSourceId(request, &it->device);
     }
   } else {
     request->devices.clear();
   }
 
   if (!request->have_permission)
     ClearDeviceLabels(&request->devices);
 
   request->requester->DevicesEnumerated(
-      request->requesting_view_id,
+      request->requesting_frame_id,
       request->page_request_id,
       label,
       request->devices);
 
   // TODO(tommi):
   // Ideally enumeration requests should be deleted once they have been served
   // (as any request).  However, this implementation mixes requests and
   // notifications together so enumeration requests are kept open by some
   // implementations (only Pepper?) and enumerations are done again when
   // device notifications are fired.
@@ skipping 316 matching lines @@
   DCHECK(!devices.empty());
 
   // Process all newly-accepted devices for this request.
   bool found_audio = false;
   bool found_video = false;
   for (MediaStreamDevices::const_iterator device_it = devices.begin();
        device_it != devices.end(); ++device_it) {
     StreamDeviceInfo device_info;
     device_info.device = *device_it;
 
-    // TODO(justinlin): Nicer way to do this?
-    // Re-append the device's id since we lost it when posting request to UI.
     if (device_info.device.type == content::MEDIA_TAB_VIDEO_CAPTURE ||
         device_info.device.type == content::MEDIA_TAB_AUDIO_CAPTURE) {
       device_info.device.id = request->UIRequest()->tab_capture_device_id;
 
       // Initialize the sample_rate and channel_layout here since for audio
       // mirroring, we don't go through EnumerateDevices where these are usually
       // initialized.
       if (device_info.device.type == content::MEDIA_TAB_AUDIO_CAPTURE) {
         const media::AudioParameters parameters =
             audio_manager_->GetDefaultOutputStreamParameters();
         int sample_rate = parameters.sample_rate();
         // If we weren't able to get the native sampling rate or the sample_rate
         // is outside the valid range for input devices set reasonable defaults.
         if (sample_rate <= 0 || sample_rate > 96000)
           sample_rate = 44100;
 
         device_info.device.input.sample_rate = sample_rate;
         device_info.device.input.channel_layout = media::CHANNEL_LAYOUT_STEREO;
       }
     }
 
     if (device_info.device.type == request->audio_type()) {
       found_audio = true;
     } else if (device_info.device.type == request->video_type()) {
       found_video = true;
     }
 
     // If this is request for a new MediaStream, a device is only opened once
-    // per render view. This is so that the permission to use a device can be
+    // per render frame. This is so that the permission to use a device can be
     // revoked by a single call to StopStreamDevice regardless of how many
     // MediaStreams it is being used in.
     if (request->request_type == MEDIA_GENERATE_STREAM) {
       MediaRequestState state;
       if (FindExistingRequestedDeviceInfo(*request,
                                           device_info.device,
                                           &device_info,
                                           &state)) {
         request->devices.push_back(device_info);
         request->SetState(device_info.device.type, state);
@@ skipping 32 matching lines @@
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   DeviceRequest* request = FindRequest(label);
   if (!request)
     return;
 
   // Notify renderers that the devices in the stream will be stopped.
   if (request->requester) {
     for (StreamDeviceInfoArray::iterator device_it = request->devices.begin();
          device_it != request->devices.end(); ++device_it) {
-      request->requester->DeviceStopped(request->requesting_view_id,
+      request->requester->DeviceStopped(request->requesting_frame_id,
                                         label,
                                         *device_it);
     }
   }
 
   CancelRequest(label);
 }
 
 void MediaStreamManager::UseFakeUI(scoped_ptr<FakeMediaStreamUIProxy> fake_ui) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
@@ skipping 118 matching lines @@
       if (it->device.type == MEDIA_DESKTOP_VIDEO_CAPTURE) {
         video_capture_manager_->SetDesktopCaptureWindowId(it->session_id,
                                                           window_id);
         break;
       }
     }
   }
 }
 
 }  // namespace content