support direct writing to top layer

gm/beziereffects.cpp

Index: gm/beziereffects.cpp
diff --git a/gm/beziereffects.cpp b/gm/beziereffects.cpp
index aebf6fbbba478e0673cd5e59e74f76aa267bc846..e80853c4de1b0b8559c798ac37a075c5d07e96e7 100644
--- a/gm/beziereffects.cpp
+++ b/gm/beziereffects.cpp
@@ -60,8 +60,7 @@ protected:
 
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
-        SkBaseDevice* device = canvas->getTopDevice();
-        GrRenderTarget* rt = device->accessRenderTarget();
+        GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget();
         if (NULL == rt) {
             return;
         }
@@ -219,8 +218,7 @@ protected:
 
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
-        SkBaseDevice* device = canvas->getTopDevice();
-        GrRenderTarget* rt = device->accessRenderTarget();
+        GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget();
         if (NULL == rt) {
             return;
         }
@@ -411,8 +409,7 @@ protected:
 
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
-        SkBaseDevice* device = canvas->getTopDevice();
-        GrRenderTarget* rt = device->accessRenderTarget();
+        GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget();
         if (NULL == rt) {
             return;
         }