gpu video: optimize HW video to SW canvas and implement it for WebRTC.

content/renderer/media/rtc_video_decoder.cc

Index: content/renderer/media/rtc_video_decoder.cc
diff --git a/content/renderer/media/rtc_video_decoder.cc b/content/renderer/media/rtc_video_decoder.cc
index 0bfc9d87f0d6ff870dcf8f304f4ba76ad09853fd..300832b89bea96c8e0b8e9640fb3df715aa92785 100644
--- a/content/renderer/media/rtc_video_decoder.cc
+++ b/content/renderer/media/rtc_video_decoder.cc
@@ -407,33 +407,6 @@ void RTCVideoDecoder::PictureReady(const media::Picture& picture) {
   }
 }
 
-static void ReadPixelsSyncInner(
-    const scoped_refptr<media::GpuVideoAcceleratorFactories>& factories,
-    uint32 texture_id,
-    const gfx::Rect& visible_rect,
-    const SkBitmap& pixels,
-    base::WaitableEvent* event) {
-  factories->ReadPixels(texture_id, visible_rect, pixels);
-  event->Signal();
-}
-
-static void ReadPixelsSync(
-    const scoped_refptr<media::GpuVideoAcceleratorFactories>& factories,
-    uint32 texture_id,
-    const gfx::Rect& visible_rect,
-    const SkBitmap& pixels) {
-  base::WaitableEvent event(true, false);
-  if (!factories->GetTaskRunner()->PostTask(FROM_HERE,
-                                            base::Bind(&ReadPixelsSyncInner,
-                                                       factories,
-                                                       texture_id,
-                                                       visible_rect,
-                                                       pixels,
-                                                       &event)))
-    return;
-  event.Wait();
-}
-
 scoped_refptr<media::VideoFrame> RTCVideoDecoder::CreateVideoFrame(
     const media::Picture& picture,
     const media::PictureBuffer& pb,
@@ -450,7 +423,6 @@ scoped_refptr<media::VideoFrame> RTCVideoDecoder::CreateVideoFrame(
           &RTCVideoDecoder::ReleaseMailbox, weak_factory_.GetWeakPtr(),
           factories_, picture.picture_buffer_id(), pb.texture_id())),
       pb.size(), visible_rect, visible_rect.size(), timestamp_ms,
-      base::Bind(&ReadPixelsSync, factories_, pb.texture_id(), visible_rect),
       picture.allow_overlay());
 }