WIP RasterCanvasLayerAllocator experiment 2

include/core/SkDevice.h

Index: include/core/SkDevice.h
diff --git a/include/core/SkDevice.h b/include/core/SkDevice.h
index c29a65d7761a29cfecc383ef5f4901be77b7c3f1..c542837a7f673999b61e79a4f1afbf1640cfde6f 100644
--- a/include/core/SkDevice.h
+++ b/include/core/SkDevice.h
@@ -21,6 +21,7 @@ class SkImageFilterCache;
 struct SkIRect;
 class SkMatrix;
 class SkMetaData;
+class SkRasterCanvasLayerAllocator;
 class SkRegion;
 class SkSpecialImage;
 class GrRenderTarget;
@@ -315,7 +316,8 @@ protected:
      *  and the caller may then decide to explicitly create a bitmapdevice, knowing that later
      *  it could not call drawDevice with it (but it could call drawSprite or drawBitmap).
      */
-    virtual SkBaseDevice* onCreateDevice(const CreateInfo&, const SkPaint*) {
+    virtual SkBaseDevice* onCreateDevice(const CreateInfo&, const SkPaint*,
+                                         SkRasterCanvasLayerAllocator*) {
         return NULL;
     }