Allow MediaSession in iframes to be routed

content/browser/media/session/mock_media_session_player_observer.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/mock_media_session_player_observer.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
 
@@ skipping 22 matching lines @@
     double volume_multiplier) {
   EXPECT_GE(player_id, 0);
   EXPECT_GT(players_.size(), static_cast<size_t>(player_id));
 
   EXPECT_GE(volume_multiplier, 0.0f);
   EXPECT_LE(volume_multiplier, 1.0f);
 
   players_[player_id].volume_multiplier_ = volume_multiplier;
 }
 
+RenderFrameHost* MockMediaSessionPlayerObserver::GetRenderFrameHost() const {
+  return nullptr;
+}
+
 int MockMediaSessionPlayerObserver::StartNewPlayer() {
   players_.push_back(MockPlayer(true, 1.0f));
   return players_.size() - 1;
 }
 
 bool MockMediaSessionPlayerObserver::IsPlaying(size_t player_id) {
   EXPECT_GT(players_.size(), player_id);
   return players_[player_id].is_playing_;
 }
 
@@ skipping 10 matching lines @@
 
 int MockMediaSessionPlayerObserver::received_suspend_calls() const {
   return received_suspend_calls_;
 }
 
 int MockMediaSessionPlayerObserver::received_resume_calls() const {
   return received_resume_calls_;
 }
 
 }  // namespace content