Implement MediaSession on top of the WebMediaPlayerDelegate.

content/renderer/media/renderer_webmediaplayer_delegate.cc

 // Copyright 2015 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/renderer/media/renderer_webmediaplayer_delegate.h"
 
 #include <stdint.h>
 
 #include "content/common/frame_messages.h"
 #include "third_party/WebKit/public/platform/WebMediaPlayer.h"
 
 namespace media {
 
 RendererWebMediaPlayerDelegate::RendererWebMediaPlayerDelegate(
     content::RenderFrame* render_frame)
     : RenderFrameObserver(render_frame) {}
 
 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),
+      player->currentTime() >= player->duration()));
+}
+
+void RendererWebMediaPlayerDelegate::PlayerGone(blink::WebMediaPlayer* 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::PlayerGone(blink::WebMediaPlayer* player) {
-  DidPause(player);
-}
-
 void RendererWebMediaPlayerDelegate::AddObserver(Observer* observer) {
   observer_list_.AddObserver(observer);
 }
 
 void RendererWebMediaPlayerDelegate::RemoveObserver(Observer* observer) {
   observer_list_.RemoveObserver(observer);
 }
 
 void RendererWebMediaPlayerDelegate::WasHidden() {
   FOR_EACH_OBSERVER(Observer, observer_list_, OnHidden());
 }
 
 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