Add a method to tab_utils.h to find out whether a tab is playing audio.

content/browser/renderer_host/media/audio_renderer_host_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 "base/bind.h"
 #include "base/environment.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/process_util.h"
 #include "base/sync_socket.h"
@@ skipping 14 matching lines @@
 using ::testing::InSequence;
 using ::testing::InvokeWithoutArgs;
 using ::testing::Return;
 using ::testing::SaveArg;
 using ::testing::SetArgumentPointee;
 
 namespace content {
 
 static const int kStreamId = 50;
 
+static const int kRenderProcessId = 42;
+
 static bool IsRunningHeadless() {
   scoped_ptr<base::Environment> env(base::Environment::Create());
   if (env->HasVar("CHROME_HEADLESS"))
     return true;
   return false;
 }
 
 class MockAudioRendererHost : public AudioRendererHost {
  public:
   explicit MockAudioRendererHost(
       media::AudioManager* audio_manager,
       MediaObserver* media_observer)
-      : AudioRendererHost(audio_manager, media_observer),
+      : AudioRendererHost(kRenderProcessId, audio_manager, media_observer),
         shared_memory_length_(0) {
   }
 
   // A list of mock methods.
   MOCK_METHOD2(OnStreamCreated,
                void(int stream_id, int length));
   MOCK_METHOD1(OnStreamPlaying, void(int stream_id));
   MOCK_METHOD1(OnStreamPaused, void(int stream_id));
   MOCK_METHOD1(OnStreamError, void(int stream_id));
   MOCK_METHOD2(OnStreamVolume, void(int stream_id, double volume));
@@ skipping 157 matching lines @@
                 OnSetAudioStreamStatus(_, kStreamId, "closed"));
 
     // Send a message to AudioRendererHost to tell it we want to close the
     // stream.
     host_->OnCloseStream(kStreamId);
     message_loop_->RunUntilIdle();
   }
 
   void Play() {
     EXPECT_CALL(*observer_,
-                OnSetAudioStreamPlaying(_, kStreamId, true));
+                OnSetAudioStreamPlaying(_, kStreamId, kRenderProcessId, 0,
+                                        true));
     EXPECT_CALL(*host_, OnStreamPlaying(kStreamId))
         .WillOnce(QuitMessageLoop(message_loop_.get()));
 
     host_->OnPlayStream(kStreamId);
     message_loop_->Run();
   }
 
   void Pause() {
     EXPECT_CALL(*observer_,
-                OnSetAudioStreamPlaying(_, kStreamId, false));
+                OnSetAudioStreamPlaying(_, kStreamId, kRenderProcessId, 0,
+                                        false));
     EXPECT_CALL(*host_, OnStreamPaused(kStreamId))
         .WillOnce(QuitMessageLoop(message_loop_.get()));
 
     host_->OnPauseStream(kStreamId);
     message_loop_->Run();
   }
 
   void SetVolume(double volume) {
     EXPECT_CALL(*observer_,
                 OnSetAudioStreamVolume(_, kStreamId, volume));
@@ skipping 146 matching lines @@
 
   Create();
   Play();
   SimulateError();
   Close();
 }
 
 // TODO(hclam): Add tests for data conversation in low latency mode.
 
 }  // namespace content