[Thumbnails] Specify copy size in Pixels, not DIPs

content/browser/compositor/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_COMPOSITOR_DELEGATED_FRAME_HOST_H_
 #define CONTENT_BROWSER_COMPOSITOR_DELEGATED_FRAME_HOST_H_
 
 #include "cc/layers/delegated_frame_provider.h"
 #include "cc/layers/delegated_frame_resource_collection.h"
 #include "cc/output/copy_output_result.h"
@@ skipping 81 matching lines @@
       scoped_ptr<cc::DelegatedFrameData> frame_data,
       float frame_device_scale_factor,
       const std::vector<ui::LatencyInfo>& latency_info);
   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.
   void CopyFromCompositingSurface(const gfx::Rect& src_subrect,
                                   const gfx::Size& output_size,
                                   ReadbackRequestCallback& callback,
                                   const SkColorType color_type);
   void CopyFromCompositingSurfaceToVideoFrame(
       const gfx::Rect& src_subrect,
       const scoped_refptr<media::VideoFrame>& target,
       const base::Callback<void(bool)>& callback);
   bool CanCopyToVideoFrame() const;
   bool CanSubscribeFrame() const;
@@ skipping 204 matching lines @@
   // YUV readback pipeline.
   scoped_ptr<content::ReadbackYUVInterface>
       yuv_readback_pipeline_;
 
   scoped_ptr<DelegatedFrameEvictor> delegated_frame_evictor_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_DELEGATED_FRAME_HOST_H_