Remove dropped frame counting and task posting from VideoFrameCompositor.

content/renderer/media/webmediaplayer_impl.cc

Index: content/renderer/media/webmediaplayer_impl.cc
diff --git a/content/renderer/media/webmediaplayer_impl.cc b/content/renderer/media/webmediaplayer_impl.cc
index ea68fc7348126590c586d2cc31718fbf749f7223..0f111646735a315208f6839f43baa15fb7f3bbc6 100644
--- a/content/renderer/media/webmediaplayer_impl.cc
+++ b/content/renderer/media/webmediaplayer_impl.cc
@@ -171,12 +171,14 @@ WebMediaPlayerImpl::WebMediaPlayerImpl(
       supports_save_(true),
       starting_(false),
       chunk_demuxer_(NULL),
-      compositor_(  // Threaded compositing isn't enabled universally yet.
-          (RenderThreadImpl::current()->compositor_message_loop_proxy()
-               ? RenderThreadImpl::current()->compositor_message_loop_proxy()
-               : base::MessageLoopProxy::current()),
+      // Threaded compositing isn't enabled universally yet.
+      compositor_task_runner_(
+          RenderThreadImpl::current()->compositor_message_loop_proxy()
+              ? RenderThreadImpl::current()->compositor_message_loop_proxy()
+              : base::MessageLoopProxy::current()),
+      compositor_(new VideoFrameCompositor(
           BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnNaturalSizeChanged),
-          BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnOpacityChanged)),
+          BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnOpacityChanged))),
       text_track_index_(0),
       web_cdm_(NULL) {
   media_log_->AddEvent(
@@ -232,6 +234,8 @@ WebMediaPlayerImpl::~WebMediaPlayerImpl() {
       base::Bind(&base::WaitableEvent::Signal, base::Unretained(&waiter)));
   waiter.Wait();
 
+  compositor_task_runner_->DeleteSoon(FROM_HERE, compositor_);
+
   // Let V8 know we are not using extra resources anymore.
   if (incremented_externally_allocated_memory_) {
     v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(
@@ -560,7 +564,7 @@ void WebMediaPlayerImpl::paint(WebCanvas* canvas,
   //   - We haven't reached HAVE_CURRENT_DATA and need to paint black
   //   - We're painting to a canvas
   // See http://crbug.com/341225 http://crbug.com/342621 for details.
-  scoped_refptr<media::VideoFrame> video_frame = compositor_.GetCurrentFrame();
+  scoped_refptr<media::VideoFrame> video_frame = compositor_->GetCurrentFrame();
 
   TRACE_EVENT0("media", "WebMediaPlayerImpl:paint");
   gfx::Rect gfx_rect(rect);
@@ -594,14 +598,7 @@ unsigned WebMediaPlayerImpl::droppedFrameCount() const {
   DCHECK(main_loop_->BelongsToCurrentThread());
 
   media::PipelineStatistics stats = pipeline_.GetStatistics();
-
-  unsigned frames_dropped = stats.video_frames_dropped;
-
-  frames_dropped += const_cast<VideoFrameCompositor&>(compositor_)
-                        .GetFramesDroppedBeforeCompositorWasNotified();
-
-  DCHECK_LE(frames_dropped, stats.video_frames_decoded);
-  return frames_dropped;
+  return stats.video_frames_dropped;
 }
 
 unsigned WebMediaPlayerImpl::audioDecodedByteCount() const {
@@ -626,7 +623,7 @@ bool WebMediaPlayerImpl::copyVideoTextureToPlatformTexture(
     unsigned int type,
     bool premultiply_alpha,
     bool flip_y) {
-  scoped_refptr<media::VideoFrame> video_frame = compositor_.GetCurrentFrame();
+  scoped_refptr<media::VideoFrame> video_frame = compositor_->GetCurrentFrame();
 
   TRACE_EVENT0("media", "WebMediaPlayerImpl:copyVideoTextureToPlatformTexture");
 
@@ -991,8 +988,8 @@ void WebMediaPlayerImpl::OnPipelineMetadata(
 
   if (hasVideo()) {
     DCHECK(!video_weblayer_);
-    video_weblayer_.reset(new webkit::WebLayerImpl(
-        cc::VideoLayer::Create(compositor_.GetVideoFrameProvider())));
+    video_weblayer_.reset(
+        new webkit::WebLayerImpl(cc::VideoLayer::Create(compositor_)));
     video_weblayer_->setOpaque(opaque_);
     client_->setWebLayer(video_weblayer_.get());
   }
@@ -1309,7 +1306,11 @@ void WebMediaPlayerImpl::OnOpacityChanged(bool opaque) {
 
 void WebMediaPlayerImpl::FrameReady(
     const scoped_refptr<media::VideoFrame>& frame) {
-  compositor_.UpdateCurrentFrame(frame);
+  compositor_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&VideoFrameCompositor::UpdateCurrentFrame,
+                 base::Unretained(compositor_),
+                 frame));
 }
 
 void WebMediaPlayerImpl::SetDecryptorReadyCB(