On Android, force a subsequent fullscreen video to exit if another one is already playing.

BUG=361550

Review URL: https://codereview.chromium.org/246523006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266673 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/media/android/browser_media_player_manager.cc

@@ -480,6 +480,10 @@ void BrowserMediaPlayerManager::OnEnterFullscreen(int player_id) {
     // fullscreen video, we just ignore the second one.
     fullscreen_player_id_ = player_id;
     video_view_.reset(new ContentVideoView(this));
+  } else {
+    // Force the second video to exit fullscreen.
+    Send(new MediaPlayerMsg_DidEnterFullscreen(routing_id(), player_id));
+    Send(new MediaPlayerMsg_DidExitFullscreen(routing_id(), player_id));
   }
 }