Update SkiaCanvasProxy with SkSurface API change

(cherry picked from commit 187b99292d0bf86e9e76b0c8d447abcbefe29afb)

Change-Id: I09a5ae6a844dec4607bc3f45e22dad93a00c0dc8
diff --git a/libs/hwui/SkiaCanvasProxy.h b/libs/hwui/SkiaCanvasProxy.h
index 973c55f..d1c9c6b 100644
--- a/libs/hwui/SkiaCanvasProxy.h
+++ b/libs/hwui/SkiaCanvasProxy.h
@@ -44,7 +44,7 @@
 
 protected:
 
-    virtual SkSurface* onNewSurface(const SkImageInfo&, const SkSurfaceProps&) override;
+    virtual sk_sp<SkSurface> onNewSurface(const SkImageInfo&, const SkSurfaceProps&) override;
 
     virtual void willSave() override;
     virtual SaveLayerStrategy getSaveLayerStrategy(const SaveLayerRec&) override;