Stretching NativeViewHost, and misc tab capture fixes.

content/browser/renderer_host/delegated_frame_host.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_HOST_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 113 matching lines @@
   void SwapDelegatedFrame(uint32_t compositor_frame_sink_id,
                           cc::CompositorFrame frame);
   void ClearDelegatedFrame();
   void WasHidden();
   void WasShown(const ui::LatencyInfo& latency_info);
   void WasResized();
   bool HasSavedFrame();
   gfx::Size GetRequestedRendererSize() const;
   void SetCompositor(ui::Compositor* compositor);
   void ResetCompositor();
-  // Note: |src_subset| is specified in DIP dimensions while |output_size|
-  // expects pixels.
+  // Note: |src_subrect| is specified in DIP dimensions while |output_size|
+  // expects pixels. If |src_subrect| is empty, the entire surface area is
+  // copied.
   void CopyFromCompositingSurface(const gfx::Rect& src_subrect,
                                   const gfx::Size& output_size,
                                   const ReadbackRequestCallback& callback,
                                   const SkColorType preferred_color_type);
   void CopyFromCompositingSurfaceToVideoFrame(
       const gfx::Rect& src_subrect,
       const scoped_refptr<media::VideoFrame>& target,
       const base::Callback<void(const gfx::Rect&, bool)>& callback);
   bool CanCopyToVideoFrame() const;
   void BeginFrameSubscription(
@@ skipping 186 matching lines @@
   // YUV readback pipeline.
   std::unique_ptr<display_compositor::ReadbackYUVInterface>
       yuv_readback_pipeline_;
 
   std::unique_ptr<DelegatedFrameEvictor> delegated_frame_evictor_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_HOST_H_