am 6afc5cf3: Merge "Prevent calling GL functions with an invalid surface"

* commit '6afc5cf3d9e1a0c0eb6ecd6eea258f1ccd37bef3':
  Prevent calling GL functions with an invalid surface

libs/hwui/renderthread/CanvasContext.cpp

@@ -59,6 +59,7 @@ CanvasContext::~CanvasContext() {
 
 void CanvasContext::destroy() {
     stopDrawing();
+    setSurface(NULL);
     freePrefetechedLayers();
     destroyHardwareResources();
     mAnimationContext->destroy();
@@ -66,7 +67,6 @@ void CanvasContext::destroy() {
         delete mCanvas;
         mCanvas = 0;
     }
-    setSurface(NULL);
 }
 
 void CanvasContext::setSurface(ANativeWindow* window) {