Query the preferred readback config in CopyFromBackingStore

content/browser/renderer_host/render_widget_host_view_gtk.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_GTK_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_
 
 #include <gdk/gdk.h>
 
 #include <string>
@@ skipping 158 matching lines @@
   virtual void AccessibilityDoDefaultAction(int acc_obj_id) OVERRIDE;
   virtual void AccessibilityScrollToMakeVisible(
       int acc_obj_id, gfx::Rect subfocus) OVERRIDE;
   virtual void AccessibilityScrollToPoint(
       int acc_obj_id, gfx::Point point) OVERRIDE;
   virtual void AccessibilitySetTextSelection(
       int acc_obj_id, int start_offset, int end_offset) OVERRIDE;
   virtual gfx::Point GetLastTouchEventLocation() const OVERRIDE;
   virtual void FatalAccessibilityTreeError() OVERRIDE;
 
+  virtual SkBitmap::Config PreferredReadbackFormat() OVERRIDE;
+
   // Get the root of the AtkObject* tree for accessibility.
   AtkObject* GetAccessible();
 
  protected:
   friend class RenderWidgetHostView;
 
   // Should construct only via RenderWidgetHostView::CreateViewForWidget.
   explicit RenderWidgetHostViewGtk(RenderWidgetHost* widget);
 
  private:
@@ skipping 141 matching lines @@
   scoped_ptr<BrowserAccessibilityManager> browser_accessibility_manager_;
 
   ui::GtkSignalRegistrar signals_;
 
   std::vector<ui::LatencyInfo> software_latency_info_;
 };
 
 }  // namespace content
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_