Allow MediaSession in iframes to be routed

content/browser/media/session/audio_focus_manager_unittest.cc

 // Copyright 2016 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/media/session/audio_focus_manager.h"
 
 #include "base/command_line.h"
 #include "content/browser/media/session/media_session_impl.h"
 #include "content/browser/media/session/media_session_player_observer.h"
 #include "content/public/test/mock_render_process_host.h"
 #include "content/public/test/test_browser_context.h"
 #include "content/public/test/test_browser_thread.h"
 #include "content/test/test_web_contents.h"
 #include "media/base/media_content_type.h"
 #include "media/base/media_switches.h"
 
 namespace content {
 
 namespace {
 
 class MockMediaSessionPlayerObserver : public MediaSessionPlayerObserver {
  public:
   void OnSuspend(int player_id) override {}
   void OnResume(int player_id) override {}
   void OnSetVolumeMultiplier(
       int player_id, double volume_multiplier) override {}
+  RenderFrameHost* GetRenderFrameHost() const override { return nullptr; }
 };
 
 }  // anonymous namespace
 
 using AudioFocusType = AudioFocusManager::AudioFocusType;
 using SuspendType = MediaSession::SuspendType;
 
 class AudioFocusManagerTest : public testing::Test {
  public:
   AudioFocusManagerTest() : ui_thread_(BrowserThread::UI, &message_loop_) {}
@@ skipping 412 matching lines @@
   ASSERT_EQ(media_session_3, GetAudioFocusedSession());
   ASSERT_TRUE(media_session_2->IsReallySuspended());
   ASSERT_TRUE(media_session_1->IsActive());
   ASSERT_TRUE(IsSessionDucking(media_session_1));
 
   AbandonAudioFocus(media_session_3);
   ASSERT_EQ(media_session_1, GetAudioFocusedSession());
 }
 
 }  // namespace content