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 0cc66a7453f4e59e5af08ee0eed9803bdcb66239..f3acbc622e4be9718f441ae478cdae3588a815cd 100644
--- a/content/renderer/media/rtc_video_decoder.cc
+++ b/content/renderer/media/rtc_video_decoder.cc
@@ -408,33 +408,6 @@ 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,
@@ -445,18 +418,12 @@ scoped_refptr<media::VideoFrame> RTCVideoDecoder::CreateVideoFrame(
   base::TimeDelta timestamp_ms = base::TimeDelta::FromInternalValue(
       base::checked_cast<uint64_t>(timestamp) * 1000 / 90);
   return media::VideoFrame::WrapNativeTexture(
-      make_scoped_ptr(new gpu::MailboxHolder(
-          pb.texture_mailbox(), decoder_texture_target_, 0)),
-      media::BindToCurrentLoop(base::Bind(&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));
+      make_scoped_ptr(new gpu::MailboxHolder(pb.texture_mailbox(),
+                                             decoder_texture_target_, 0)),
+      media::BindToCurrentLoop(base::Bind(
+          &RTCVideoDecoder::ReleaseMailbox, weak_factory_.GetWeakPtr(),
+          factories_, picture.picture_buffer_id(), pb.texture_id())),
+      pb.size(), visible_rect, visible_rect.size(), timestamp_ms);
 }
 
 void RTCVideoDecoder::NotifyEndOfBitstreamBuffer(int32 id) {