Propagate media play/pause to WebContentsObserver for Chromecast metrics

content/browser/web_contents/web_contents_impl.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/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 3308 matching lines @@
     }
   }
 
   if (has_video) {
     AddMediaPlayerEntry(player_cookie, &active_video_players_);
 
     // If we're not hidden and have just created a player, create a blocker.
     if (!video_power_save_blocker_ && !IsHidden())
       CreateVideoPowerSaveBlocker();
   }
+
+  FOR_EACH_OBSERVER(WebContentsObserver, observers_, MediaStartedPlaying());
 }
 
 void WebContentsImpl::OnMediaPausedNotification(int64 player_cookie) {
   RemoveMediaPlayerEntry(player_cookie, &active_audio_players_);
   RemoveMediaPlayerEntry(player_cookie, &active_video_players_);
   MaybeReleasePowerSaveBlockers();
+
+  FOR_EACH_OBSERVER(WebContentsObserver, observers_, MediaPaused());
 }
 
 void WebContentsImpl::OnFirstVisuallyNonEmptyPaint() {
   FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                     DidFirstVisuallyNonEmptyPaint());
 
   if (theme_color_ != last_sent_theme_color_) {
     // Theme color should have updated by now if there was one.
     FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                       DidChangeThemeColor(theme_color_));
@@ skipping 1277 matching lines @@
   node->render_manager()->ResumeResponseDeferredAtStart();
 }
 
 void WebContentsImpl::SetForceDisableOverscrollContent(bool force_disable) {
   force_disable_overscroll_content_ = force_disable;
   if (view_)
     view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 }
 
 }  // namespace content