Adding setSurface public API method to SkDeferredCanvas

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
 
@@ skipping 36 matching lines @@
      *  Specify a device to be used by this canvas. Calling setDevice will
      *  release the previously set device, if any. Takes a reference on the
      *  device.
      *
      *  @param device The device that the canvas will raw into
      *  @return The device argument, for convenience.
      */
     virtual SkDevice* setDevice(SkDevice* device);
 
     /**
+     *  Specify the surface to be used by this canvas. Calling setSurface will
+     *  release the previously set surface or device. Takes a reference on the
+     *  surface.
+     *
+     *  @param surface The surface that the canvas will raw into
+     *  @return The surface argument, for convenience.
+     */
+    SkSurface* setSurface(SkSurface* surface);
+
+    /**
      *  Specify a NotificationClient to be used by this canvas. Calling
      *  setNotificationClient will release the previously set
      *  NotificationClient, if any. SkDeferredCanvas does not take ownership
      *  of the notification client.  Therefore user code is resposible
      *  for its destruction.  The notification client must be unregistered
      *  by calling setNotificationClient(NULL) if it is destroyed before
      *  this canvas.
      *  Note: Must be called after the device is set with setDevice.
      *
      *  @param notificationClient interface for dispatching notifications
@@ skipping 184 matching lines @@
     void validate() const;
     void init();
     bool            fDeferredDrawing;
 
     friend class SkDeferredCanvasTester; // for unit testing
     typedef SkCanvas INHERITED;
 };
 
 
 #endif