initial preroll api

include/core/SkCanvas.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCanvas_DEFINED
 #define SkCanvas_DEFINED
 
@@ skipping 69 matching lines @@
      *  Creates an empty canvas with no backing device/pixels, and zero
      *  dimensions.
      */
     SkCanvas();
 
     /**
      *  Creates a canvas of the specified dimensions, but explicitly not backed
      *  by any device/pixels. Typically this use used by subclasses who handle
      *  the draw calls in some other way.
      */
-    SkCanvas(int width, int height);
+    SkCanvas(int width, int height, const SkSurfaceProps* = NULL);
 
     /** Construct a canvas with the specified device to draw into.
 
         @param device   Specifies a device for the canvas to draw into.
     */
     explicit SkCanvas(SkBaseDevice* device);
 
     /** Construct a canvas with the specified bitmap to draw into.
         @param bitmap   Specifies a bitmap for the canvas to draw into. Its
                         structure are copied to the canvas.
@@ skipping 1384 matching lines @@
 
 class SkCanvasClipVisitor {
 public:
     virtual ~SkCanvasClipVisitor();
     virtual void clipRect(const SkRect&, SkRegion::Op, bool antialias) = 0;
     virtual void clipRRect(const SkRRect&, SkRegion::Op, bool antialias) = 0;
     virtual void clipPath(const SkPath&, SkRegion::Op, bool antialias) = 0;
 };
 
 #endif