Reland of Use spec-compliant algorithm to select video devices in getUserMedia.

content/renderer/render_frame_impl.cc

 // Copyright 2013 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/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 6112 matching lines @@
       selection_text_ != text) {
     selection_text_ = text;
     selection_text_offset_ = offset;
     selection_range_ = range;
     SetSelectedText(text, offset, range);
   }
   GetRenderWidget()->UpdateSelectionBounds();
 }
 
 void RenderFrameImpl::InitializeUserMediaClient() {
-  if (!RenderThreadImpl::current())  // Will be NULL during unit tests.
+  RenderThreadImpl* render_thread = RenderThreadImpl::current();
+  if (!render_thread)  // Will be NULL during unit tests.
     return;
 
 #if BUILDFLAG(ENABLE_WEBRTC)
   DCHECK(!web_user_media_client_);
   web_user_media_client_ = new UserMediaClientImpl(
       this, RenderThreadImpl::current()->GetPeerConnectionDependencyFactory(),
-      base::MakeUnique<MediaStreamDispatcher>(this));
+      base::MakeUnique<MediaStreamDispatcher>(this),
+      render_thread->GetWorkerTaskRunner());
   GetInterfaceRegistry()->AddInterface(
       base::Bind(&MediaDevicesListenerImpl::Create, GetRoutingID()));
 #endif
 }
 
 WebMediaPlayer* RenderFrameImpl::CreateWebMediaPlayerForMediaStream(
     WebMediaPlayerClient* client,
     const WebString& sink_id,
     const WebSecurityOrigin& security_origin) {
 #if BUILDFLAG(ENABLE_WEBRTC)
@@ skipping 679 matching lines @@
   // event target. Potentially a Pepper plugin will receive the event.
   // In order to tell whether a plugin gets the last mouse event and which it
   // is, we set |pepper_last_mouse_event_target_| to null here. If a plugin gets
   // the event, it will notify us via DidReceiveMouseEvent() and set itself as
   // |pepper_last_mouse_event_target_|.
   pepper_last_mouse_event_target_ = nullptr;
 #endif
 }
 
 }  // namespace content