Maintain minimal error response.

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 141 matching lines @@
 
   // Create a BrowserAccessibilityManager for this view.
   virtual BrowserAccessibilityManager* CreateBrowserAccessibilityManager(
       BrowserAccessibilityDelegate* delegate);
 
   virtual void AccessibilityShowMenu(const gfx::Point& point);
   virtual gfx::Point AccessibilityOriginInScreen(const gfx::Rect& bounds);
   virtual gfx::AcceleratedWidget AccessibilityGetAcceleratedWidget();
   virtual gfx::NativeViewAccessible AccessibilityGetNativeViewAccessible();
 
-  virtual SkColorType PreferredReadbackFormat();
-
   // Informs that the focused DOM node has changed.
   virtual void FocusedNodeChanged(bool is_editable_node) {}
 
   virtual void OnSwapCompositorFrame(uint32 output_surface_id,
                                      scoped_ptr<cc::CompositorFrame> frame) {}
 
   // Because the associated remote WebKit instance can asynchronously
   // prevent-default on a dispatched touch event, the touch events are queued in
   // the GestureRecognizer until invocation of ProcessAckedTouchEvent releases
   // it to be consumed (when |ack_result| is NOT_CONSUMED OR NO_CONSUMER_EXISTS)
@@ skipping 74 matching lines @@
 
   // 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. 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;
+  virtual void CopyFromCompositingSurface(
+      const gfx::Rect& src_subrect,
+      const gfx::Size& dst_size,
+      ReadbackRequestCallback& callback,
+      const SkColorType preferred_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,
   // |callback| is asynchronously run with true/false for
   // success/failure. |target| must point to an allocated, YV12 video frame of
   // the intended size. This operation will fail if there is no available
   // compositing surface.
@@ 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_