Update BackingStore to handle the case where our Cocoa view has...

chrome/browser/renderer_host/backing_store.h

 // Copyright (c) 2006-2008 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 CHROME_BROWSER_RENDERER_HOST_BACKING_STORE_H_
 #define CHROME_BROWSER_RENDERER_HOST_BACKING_STORE_H_
 
 #include "base/basictypes.h"
 #include "base/gfx/rect.h"
 #include "base/gfx/size.h"
@@ skipping 46 matching lines @@
 
 #if defined(OS_WIN)
   HDC hdc() { return hdc_; }
 
   // Returns true if we should convert to the monitor profile when painting.
   static bool ColorManagementEnabled();
 #elif defined(OS_MACOSX)
   // A CGLayer that stores the contents of the backing store, cached in GPU
   // memory if possible.
   CGLayerRef cg_layer() { return cg_layer_; }
+  // A CGBitmapContext that stores the contents of the backing store if the
+  // corresponding Cocoa view has not been inserted into an NSWindow yet.
+  CGContextRef cg_bitmap() { return cg_bitmap_; }
+
   // Paint the layer into a graphics context--if the target is a window,
   // this should be a GPU->GPU copy (and therefore very fast).
   void PaintToRect(const gfx::Rect& dest_rect, CGContextRef target);
 #elif defined(OS_LINUX)
   Display* display() const { return display_; }
   XID root_window() const { return root_window_; };
 
   // Copy from the server-side backing store to the target window
   //   display: the display of the backing store and target window
   //   damage: the area to copy
@@ skipping 34 matching lines @@
 #if defined(OS_WIN)
   // The backing store dc.
   HDC hdc_;
   // Handle to the backing store dib.
   HANDLE backing_store_dib_;
   // Handle to the original bitmap in the dc.
   HANDLE original_bitmap_;
   // Number of bits per pixel of the screen.
   int color_depth_;
 #elif defined(OS_MACOSX)
+  scoped_cftyperef<CGContextRef> cg_bitmap_;
   scoped_cftyperef<CGLayerRef> cg_layer_;
 #elif defined(OS_LINUX)
   // Paints the bitmap from the renderer onto the backing store without
   // using Xrender to composite the pixmaps.
   void PaintRectWithoutXrender(TransportDIB* bitmap,
                                const gfx::Rect& bitmap_rect);
 
   // This is the connection to the X server where this backing store will be
   // displayed.
   Display* const display_;
@@ skipping 14 matching lines @@
   // This is the RENDER picture pointing at |pixmap_|.
   XID picture_;
   // This is a default graphic context, used in XCopyArea
   void* pixmap_gc_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(BackingStore);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_BACKING_STORE_H_