Add ability to copy unscaled output pixels.

content/browser/renderer_host/render_widget_host_view_base.h

 // Copyright (c) 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_
 
 #if defined(OS_MACOSX)
 #include <OpenGL/OpenGL.h>
 #endif
@@ skipping 238 matching lines @@
   // Notifies the View that the renderer selection bounds has changed.
   // |start_rect| and |end_rect| are the bounds end of the selection in the
   // coordinate system of the render view. |start_direction| and |end_direction|
   // indicates the direction at which the selection was made on touch devices.
   virtual void SelectionBoundsChanged(
       const ViewHostMsg_SelectionBounds_Params& params) = 0;
 
   // Copies the contents of the compositing surface, providing a new SkBitmap
   // result via an asynchronously-run |callback|. |src_subrect| is specified in
   // layer space coordinates for the current platform (e.g., DIP for Aura/Mac,
-  // physical for Android), and is the region to be copied from this view. The
-  // copy is then scaled to a SkBitmap of size |dst_size|. |callback| is run
-  // with true on success, false otherwise. A smaller region than |src_subrect|
-  // may be copied if the underlying surface is smaller than |src_subrect|.
+  // physical for Android), and is the region to be copied from this view. When
+  // |src_subrect| is empty then the whole surface will be copied. The copy is
+  // then scaled to a SkBitmap of size |dst_size|. If |dst_size| is empty then
+  // output will be unscaled. |callback| is run with true on success,
+  // false otherwise. A smaller region than |src_subrect| may be copied
+  // if the underlying surface is smaller than |src_subrect|.
   virtual void CopyFromCompositingSurface(const gfx::Rect& src_subrect,
                                           const gfx::Size& dst_size,
                                           ReadbackRequestCallback& callback,
                                           const SkColorType color_type) = 0;
 
   // Copies the contents of the compositing surface, populating the given
   // |target| with YV12 image data. |src_subrect| is specified in layer space
   // coordinates for the current platform (e.g., DIP for Aura/Mac, physical for
   // Android), and is the region to be copied from this view. The copy is then
   // scaled and letterboxed with black borders to fit |target|. Finally,
@@ skipping 148 matching lines @@
   base::OneShotTimer<RenderWidgetHostViewBase> flush_input_timer_;
 
   base::WeakPtrFactory<RenderWidgetHostViewBase> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewBase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_