Implement MediaSession on top of the WebMediaPlayerDelegate.

media/blink/webmediaplayer_impl.cc

Index: media/blink/webmediaplayer_impl.cc
diff --git a/media/blink/webmediaplayer_impl.cc b/media/blink/webmediaplayer_impl.cc
index dc174674c5d3224d7450c56e611e13c157da2230..a8a5e2427221e8d674e0ba2ca8da4e41066aa302 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -213,10 +213,8 @@ WebMediaPlayerImpl::~WebMediaPlayerImpl() {
 
   DCHECK(main_task_runner_->BelongsToCurrentThread());
 
-  if (delegate_) {
-    delegate_->RemoveObserver(this);
+  if (delegate_)
     delegate_->PlayerGone(this);
-  }
 
   // Abort any pending IO so stopping the pipeline doesn't get blocked.
   if (data_source_)
@@ -1117,6 +1115,16 @@ void WebMediaPlayerImpl::OnShown() {
   Resume();
 }
 
+void WebMediaPlayerImpl::OnPlay() {
+  play();
+  client_->playbackStateChanged();
+}
+
+void WebMediaPlayerImpl::OnPause() {
+  pause();
+  client_->playbackStateChanged();
+}
+
 void WebMediaPlayerImpl::Resume() {
   DCHECK(main_task_runner_->BelongsToCurrentThread());
   CHECK(suspended_);
@@ -1331,8 +1339,10 @@ void WebMediaPlayerImpl::UpdatePausedTime() {
 }
 
 void WebMediaPlayerImpl::NotifyPlaybackStarted() {
-  if (delegate_)
-    delegate_->DidPlay(this);
+  if (delegate_) {
+    delegate_->DidPlay(this, hasVideo(), hasAudio(), false,
+                       pipeline_.GetMediaDuration());
+  }
   if (!memory_usage_reporting_timer_.IsRunning()) {
     memory_usage_reporting_timer_.Start(FROM_HERE,
                                         base::TimeDelta::FromSeconds(2), this,
@@ -1342,7 +1352,7 @@ void WebMediaPlayerImpl::NotifyPlaybackStarted() {
 
 void WebMediaPlayerImpl::NotifyPlaybackPaused() {
   if (delegate_)
-    delegate_->DidPause(this);
+    delegate_->DidPause(this, ended_);
   memory_usage_reporting_timer_.Stop();
   ReportMemoryUsage();
 }