Optimize webgl texImage2D from YUV video textures.

content/renderer/media/webmediaplayer_ms.cc

Index: content/renderer/media/webmediaplayer_ms.cc
diff --git a/content/renderer/media/webmediaplayer_ms.cc b/content/renderer/media/webmediaplayer_ms.cc
index b03fedd8d5365e00e9c19a7bc58af7418c6bf407..ae3ae2b19833f1b84f5809c1f81316d0b749d808 100644
--- a/content/renderer/media/webmediaplayer_ms.cc
+++ b/content/renderer/media/webmediaplayer_ms.cc
@@ -458,15 +458,20 @@ bool WebMediaPlayerMS::copyVideoTextureToPlatformTexture(
   scoped_refptr<media::VideoFrame> video_frame =
       compositor_->GetCurrentFrameWithoutUpdatingStatistics();
 
-  if (!video_frame.get() || !video_frame->HasTextures() ||
-      media::VideoFrame::NumPlanes(video_frame->format()) != 1) {
+  if (!video_frame.get() || !video_frame->HasTextures())
     return false;
-  }
 
-  media::SkCanvasVideoRenderer::CopyVideoFrameSingleTextureToGLTexture(
-      gl, video_frame.get(), texture, internal_format, type, premultiply_alpha,
-      flip_y);
-  return true;
+  media::Context3D context_3d;
+  auto* provider =
+      RenderThreadImpl::current()->SharedMainThreadContextProvider().get();

[Daniele Castagna, 2016/07/11 18:23:35]

Isn't there a way to get a context provider without explicitly assuming which
one it is?

+  // GPU Process crashed.
+  if (!provider)
+    return false;
+  context_3d = media::Context3D(provider->ContextGL(), provider->GrContext());
+  DCHECK(context_3d.gl);
+  return media::SkCanvasVideoRenderer::CopyVideoFrameTexturesToGLTexture(

[Daniele Castagna, 2016/07/11 18:23:35]

When is gl different than context_3d.gl?

+      context_3d, gl, video_frame.get(), texture, internal_format, type,
+      premultiply_alpha, flip_y);
 }
 
 void WebMediaPlayerMS::OnFrameAvailable(