Support browser side thumbnailing for GPU composited pages on Windows.

content/browser/renderer_host/render_widget_host.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_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
 #pragma once
 
 #include <deque>
 #include <string>
@@ skipping 94 matching lines @@
   // and doesn't put the results into the backing store.
   virtual void PaintAtSize(TransportDIB::Handle dib_handle,
                            int tag,
                            const gfx::Size& page_size,
                            const gfx::Size& desired_size) = 0;
 
   // Copies the contents of the backing store into the given (uninitialized)
   // PlatformCanvas. Returns true on success, false otherwise.
   virtual bool CopyFromBackingStore(skia::PlatformCanvas* output) = 0;
 
+  // Copies the contents of the compositing surface into the given
+  // (uninitialized) PlatformCanvas if any. Returns true on success, false
+  // otherwise.
+  virtual bool CopyFromCompositingSurface(skia::PlatformCanvas* output) = 0;
+
 #if defined(TOOLKIT_GTK)
   // Paint the backing store into the target's |dest_rect|.
   virtual bool CopyFromBackingStoreToGtkWindow(const gfx::Rect& dest_rect,
                                                GdkWindow* target) = 0;
 #elif defined(OS_MACOSX)
   virtual gfx::Size GetBackingStoreSize() = 0;
   virtual bool CopyFromBackingStoreToCGContext(const CGRect& dest_rect,
                                                CGContextRef target) = 0;
 #endif
 
@@ skipping 192 matching lines @@
     return is_accelerated_compositing_active_;
   }
 
   // Notifies the RenderWidgetHost that the View was destroyed.
   void ViewDestroyed();
 
   // Indicates if the page has finished loading.
   void SetIsLoading(bool is_loading);
 
   virtual bool CopyFromBackingStore(skia::PlatformCanvas* output) OVERRIDE;
+  virtual bool CopyFromCompositingSurface(
+      skia::PlatformCanvas* output) OVERRIDE;
 #if defined(TOOLKIT_GTK)
   virtual bool CopyFromBackingStoreToGtkWindow(const gfx::Rect& dest_rect,
                                                GdkWindow* target) OVERRIDE;
 #elif defined(OS_MACOSX)
   virtual gfx::Size GetBackingStoreSize() OVERRIDE;
   virtual bool CopyFromBackingStoreToCGContext(const CGRect& dest_rect,
                                                CGContextRef target) OVERRIDE;
 #endif
   virtual void PaintAtSize(TransportDIB::Handle dib_handle,
                            int tag,
@@ skipping 560 matching lines @@
   // then touch events are sent to the renderer. Otherwise, the touch events are
   // not sent to the renderer.
   bool has_touch_handler_;
 
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_