support direct writing to top layer

include/utils/SkDeferredCanvas.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDeferredCanvas_DEFINED
 #define SkDeferredCanvas_DEFINED
 
 #include "SkCanvas.h"
 #include "SkPixelRef.h"
 
-class DeferredDevice;
+class SkDeferredDevice;
 class SkImage;
 class SkSurface;
 
 /** \class SkDeferredCanvas
     Subclass of SkCanvas that encapsulates an SkPicture or SkGPipe for deferred
     drawing. The main difference between this class and SkPictureRecord (the
     canvas provided by SkPicture) is that this is a full drop-in replacement
     for SkCanvas, while SkPictureRecord only supports draw operations.
     SkDeferredCanvas will transparently trigger the flushing of deferred
     draw operations when an attempt is made to access the pixel data.
@@ skipping 204 matching lines @@
         /**
          *  Called after pending draw commands have been skipped, meaning
          *  that they were optimized-out because the canvas is cleared
          *  or completely overwritten by the command currently being recorded.
          */
         virtual void skippedPendingDrawCommands() {}
     };
 
 protected:
     virtual SkCanvas* canvasForDrawIter();
-    DeferredDevice* getDeferredDevice() const;
+    SkDeferredDevice* getDeferredDevice() const;
 
 private:
-    SkDeferredCanvas(DeferredDevice*);
+    SkDeferredCanvas(SkDeferredDevice*);
 
     void recordedDrawCommand();
     SkCanvas* drawingCanvas() const;
     SkCanvas* immediateCanvas() const;
     bool isFullFrame(const SkRect*, const SkPaint*) const;
     void validate() const;
     void init();
     bool            fDeferredDrawing;
 
     friend class SkDeferredCanvasTester; // for unit testing
     typedef SkCanvas INHERITED;
 };
 
 
 #endif