Implement GetUserMedia device ID constraint processing in the renderer.

content/renderer/media/user_media_client_impl_unittest.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/renderer/media/user_media_client_impl.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
@@ skipping 92 matching lines @@
         state_(REQUEST_NOT_STARTED),
         result_(NUM_MEDIA_REQUEST_RESULTS),
         result_name_(""),
         factory_(dependency_factory),
         create_source_that_fails_(false),
         video_source_(NULL) {}
 
   void RequestUserMedia(const blink::WebUserMediaRequest& user_media_request) {
     state_ = REQUEST_NOT_COMPLETE;
     requestUserMedia(user_media_request);
+    base::RunLoop().RunUntilIdle();
   }
 
   void RequestUserMedia() {
     blink::WebUserMediaRequest user_media_request;
     RequestUserMedia(user_media_request);
   }
 
   void RequestMediaDevices() {
     blink::WebMediaDevicesRequest media_devices_request;
     state_ = REQUEST_NOT_COMPLETE;
@@ skipping 590 matching lines @@
   // Now we load a new document in the web frame. If in the above Stop() call,
   // UserMediaClientImpl accidentally removed audio track, then video track will
   // be removed again here, which is incorrect.
   LoadNewDocumentInFrame();
   blink::WebHeap::collectAllGarbageForTesting();
   EXPECT_EQ(1, ms_dispatcher_->stop_video_device_counter());
   EXPECT_EQ(1, ms_dispatcher_->stop_audio_device_counter());
 }
 
 }  // namespace content