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

cc/trees/layer_tree_host_unittest_context.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include "base/basictypes.h"
 #include "cc/layers/content_layer.h"
 #include "cc/layers/delegated_frame_provider.h"
 #include "cc/layers/delegated_frame_resource_collection.h"
@@ skipping 1063 matching lines @@
     video_scaled_hw->SetBounds(gfx::Size(10, 10));
     video_scaled_hw->SetIsDrawable(true);
     root->AddChild(video_scaled_hw);
 
     color_video_frame_ = VideoFrame::CreateColorFrame(
         gfx::Size(4, 4), 0x80, 0x80, 0x80, base::TimeDelta());
     hw_video_frame_ = VideoFrame::WrapNativeTexture(
         make_scoped_ptr(
             new gpu::MailboxHolder(mailbox, GL_TEXTURE_2D, sync_point)),
         media::VideoFrame::ReleaseMailboxCB(), gfx::Size(4, 4),
-        gfx::Rect(0, 0, 4, 4), gfx::Size(4, 4), base::TimeDelta(),
-        VideoFrame::ReadPixelsCB(), false);
+        gfx::Rect(0, 0, 4, 4), gfx::Size(4, 4), base::TimeDelta(), false);
     scaled_hw_video_frame_ = VideoFrame::WrapNativeTexture(
         make_scoped_ptr(
             new gpu::MailboxHolder(mailbox, GL_TEXTURE_2D, sync_point)),
         media::VideoFrame::ReleaseMailboxCB(), gfx::Size(4, 4),
-        gfx::Rect(0, 0, 3, 2), gfx::Size(4, 4), base::TimeDelta(),
-        VideoFrame::ReadPixelsCB(), false);
+        gfx::Rect(0, 0, 3, 2), gfx::Size(4, 4), base::TimeDelta(), false);
 
     color_frame_provider_.set_frame(color_video_frame_);
     hw_frame_provider_.set_frame(hw_video_frame_);
     scaled_hw_frame_provider_.set_frame(scaled_hw_video_frame_);
 
     if (!delegating_renderer()) {
       // TODO(danakj): IOSurface layer can not be transported. crbug.com/239335
       scoped_refptr<IOSurfaceLayer> io_surface = IOSurfaceLayer::Create();
       io_surface->SetBounds(gfx::Size(10, 10));
       io_surface->SetIsDrawable(true);
@@ skipping 694 matching lines @@
   void AfterTest() override {}
 
   bool deferred_;
 };
 
 SINGLE_AND_MULTI_THREAD_TEST_F(
     LayerTreeHostContextTestLoseAfterSendingBeginMainFrame);
 
 }  // namespace
 }  // namespace cc