media: Optimize HW Video to 2D Canvas copy.

cc/resources/video_resource_updater.cc

Index: cc/resources/video_resource_updater.cc
diff --git a/cc/resources/video_resource_updater.cc b/cc/resources/video_resource_updater.cc
index a1286b917b4f2bde8af4248eb7654b2da202db4d..88c84683339d4586cb9674179b64d91704c639c5 100644
--- a/cc/resources/video_resource_updater.cc
+++ b/cc/resources/video_resource_updater.cc
@@ -7,11 +7,11 @@
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "cc/output/gl_renderer.h"
+#include "cc/resources/media/skcanvas_video_renderer.h"
 #include "cc/resources/resource_provider.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "media/base/video_frame.h"
-#include "media/filters/skcanvas_video_renderer.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "third_party/khronos/GLES2/gl2ext.h"
 #include "ui/gfx/size_conversions.h"
@@ -244,15 +244,17 @@ VideoFrameExternalResources VideoResourceUpdater::CreateForSoftwarePlanes(
     DCHECK(plane_resources[0].mailbox.IsZero());
 
     if (!video_renderer_)
-      video_renderer_.reset(new media::SkCanvasVideoRenderer);
+      video_renderer_.reset(new SkCanvasVideoRenderer);
 
     {
       ResourceProvider::ScopedWriteLockSoftware lock(
           resource_provider_, plane_resources[0].resource_id);
+      lock.sk_canvas()->clear(SK_ColorTRANSPARENT);
       video_renderer_->Paint(video_frame.get(),
                              lock.sk_canvas(),
                              video_frame->visible_rect(),
-                             0xff);
+                             0xff,
+                             0);
     }
 
     RecycleResourceData recycle_data = {