Implement full View.buildLayer

 Bug: 17152292

Change-Id: Ia3cc2aadf72fe14517f50762fc634794df51ad5a
diff --git a/libs/hwui/renderthread/CanvasContext.h b/libs/hwui/renderthread/CanvasContext.h
index 2a01027..0cbed6f 100644
--- a/libs/hwui/renderthread/CanvasContext.h
+++ b/libs/hwui/renderthread/CanvasContext.h
@@ -65,6 +65,7 @@
     // IFrameCallback, Chroreographer-driven frame callback entry point
     virtual void doFrame();
 
+    void buildLayer(RenderNode* node);
     bool copyLayerInto(DeferredLayerUpdater* layer, SkBitmap* bitmap);
 
     void destroyHardwareResources();