Add support for switching the audio output device for HTMLMediaElements.

content/browser/renderer_host/media/audio_renderer_host_unittest.cc

Index: content/browser/renderer_host/media/audio_renderer_host_unittest.cc
diff --git a/content/browser/renderer_host/media/audio_renderer_host_unittest.cc b/content/browser/renderer_host/media/audio_renderer_host_unittest.cc
index c50430e074e2ea540346923383fabbf8c5081507..a2e2d6784907529b987f89d365cf3e78c8fad971 100644
--- a/content/browser/renderer_host/media/audio_renderer_host_unittest.cc
+++ b/content/browser/renderer_host/media/audio_renderer_host_unittest.cc
@@ -55,12 +55,14 @@ class MockAudioRendererHost : public AudioRendererHost {
   MockAudioRendererHost(media::AudioManager* audio_manager,
                         AudioMirroringManager* mirroring_manager,
                         MediaInternals* media_internals,
-                        MediaStreamManager* media_stream_manager)
+                        MediaStreamManager* media_stream_manager,
+                        const ResourceContext::SaltCallback& salt_callback)
       : AudioRendererHost(kRenderProcessId,
                           audio_manager,
                           mirroring_manager,
                           media_internals,
-                          media_stream_manager),
+                          media_stream_manager,
+                          salt_callback),
         shared_memory_length_(0) {}
 
   // A list of mock methods.
@@ -140,6 +142,16 @@ class MockAudioRendererHost : public AudioRendererHost {
   DISALLOW_COPY_AND_ASSIGN(MockAudioRendererHost);
 };
 
+namespace {
+  std::string ReturnMockSalt() {
+    return std::string();
+  }
+
+  ResourceContext::SaltCallback GetMockSaltCallback() {
+    return base::Bind(&ReturnMockSalt);
+  }
+}
+
 class AudioRendererHostTest : public testing::Test {
  public:
   AudioRendererHostTest() {
@@ -150,7 +162,8 @@ class AudioRendererHostTest : public testing::Test {
     host_ = new MockAudioRendererHost(audio_manager_.get(),
                                       &mirroring_manager_,
                                       MediaInternals::GetInstance(),
-                                      media_stream_manager_.get());
+                                      media_stream_manager_.get(),
+                                      GetMockSaltCallback());
 
     // Simulate IPC channel connected.
     host_->set_peer_process_for_testing(base::Process::Current());