WIP RasterCanvasLayerAllocator experiment 2

src/gpu/SkGpuDevice.h

Index: src/gpu/SkGpuDevice.h
diff --git a/src/gpu/SkGpuDevice.h b/src/gpu/SkGpuDevice.h
index a49d1607328da85edf2b3cc85a07a94e3dfbaf43..6974738f513015d3bda9b338b1f03fddd4225693 100644
--- a/src/gpu/SkGpuDevice.h
+++ b/src/gpu/SkGpuDevice.h
@@ -150,7 +150,8 @@ private:
 
     SkGpuDevice(sk_sp<GrDrawContext>, int width, int height, unsigned flags);
 
-    SkBaseDevice* onCreateDevice(const CreateInfo&, const SkPaint*) override;
+    SkBaseDevice* onCreateDevice(const CreateInfo&, const SkPaint*,
+                                 SkRasterCanvasLayerAllocator*) override;
 
     sk_sp<SkSurface> makeSurface(const SkImageInfo&, const SkSurfaceProps&) override;