Implement TODO

Change-Id: I551ad0dab6356baa4c7787718b54d5b7337a3f26
diff --git a/libs/hwui/renderthread/CanvasContext.cpp b/libs/hwui/renderthread/CanvasContext.cpp
index 491a295..0a17e132 100644
--- a/libs/hwui/renderthread/CanvasContext.cpp
+++ b/libs/hwui/renderthread/CanvasContext.cpp
@@ -110,8 +110,7 @@
 }
 
 void CanvasContext::pauseSurface(ANativeWindow* window) {
-    // TODO: For now we just need a fence, in the future suspend any animations
-    // and such to prevent from trying to render into this surface
+    stopDrawing();
 }
 
 void CanvasContext::setup(int width, int height, const Vector3& lightCenter, float lightRadius,