Implement MediaSession on top of the WebMediaPlayerDelegate.

content/renderer/media/renderer_webmediaplayer_delegate.cc

Index: content/renderer/media/renderer_webmediaplayer_delegate.cc
diff --git a/content/renderer/media/renderer_webmediaplayer_delegate.cc b/content/renderer/media/renderer_webmediaplayer_delegate.cc
index 081f774ff31d576fe5b9fff5809112df081d0d49..c32eb6e315ecd64e6af8647956f02d9a0dd7e03d 100644
--- a/content/renderer/media/renderer_webmediaplayer_delegate.cc
+++ b/content/renderer/media/renderer_webmediaplayer_delegate.cc
@@ -19,18 +19,25 @@ RendererWebMediaPlayerDelegate::~RendererWebMediaPlayerDelegate() {}
 
 void RendererWebMediaPlayerDelegate::DidPlay(blink::WebMediaPlayer* player) {
   has_played_media_ = true;
+  players_.insert(player);
   Send(new FrameHostMsg_MediaPlayingNotification(
       routing_id(), reinterpret_cast<int64_t>(player), player->hasVideo(),
-      player->hasAudio(), player->isRemote()));
+      player->hasAudio(), player->isRemote(),
+      base::TimeDelta::FromSecondsD(player->duration())));
 }
 
 void RendererWebMediaPlayerDelegate::DidPause(blink::WebMediaPlayer* player) {
+  DCHECK_EQ(players_.count(player), 1u);
   Send(new FrameHostMsg_MediaPausedNotification(
-      routing_id(), reinterpret_cast<int64_t>(player)));
+      routing_id(), reinterpret_cast<int64_t>(player),
+      player->currentTime() >= player->duration()));
 }
 
 void RendererWebMediaPlayerDelegate::PlayerGone(blink::WebMediaPlayer* player) {
-  DidPause(player);
+  // No player may exist, so this might be a no-op.
+  players_.erase(player);
+  Send(new FrameHostMsg_MediaDestroyedNotification(
+      routing_id(), reinterpret_cast<int64_t>(player)));
 }
 
 void RendererWebMediaPlayerDelegate::AddObserver(Observer* observer) {
@@ -49,4 +56,37 @@ void RendererWebMediaPlayerDelegate::WasShown() {
   FOR_EACH_OBSERVER(Observer, observer_list_, OnShown());
 }
 
+bool RendererWebMediaPlayerDelegate::OnMessageReceived(
+    const IPC::Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(RendererWebMediaPlayerDelegate, msg)
+    IPC_MESSAGE_HANDLER(FrameMsg_MediaDelegatePause, OnMediaDelegatePause)
+    IPC_MESSAGE_HANDLER(FrameMsg_MediaDelegatePlay, OnMediaDelegatePlay)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void RendererWebMediaPlayerDelegate::OnMediaDelegatePause(
+    int64_t player_cookie) {
+  // Translate the player cookie back to a WebMediaPlayer instance and make sure
+  // it's still a valid instance.
+  blink::WebMediaPlayer* player =
+      reinterpret_cast<blink::WebMediaPlayer*>(player_cookie);
+  if (players_.find(player) == players_.end())
+    return;
+  player->pause();
+}
+
+void RendererWebMediaPlayerDelegate::OnMediaDelegatePlay(
+    int64_t player_cookie) {
+  // Translate the player cookie back to a WebMediaPlayer instance and make sure
+  // it's still a valid instance.
+  blink::WebMediaPlayer* player =
+      reinterpret_cast<blink::WebMediaPlayer*>(player_cookie);
+  if (players_.find(player) == players_.end())
+    return;
+  player->play();
+}
+
 }  // namespace media