Make updateSurface non-blocking

Bug: 30442298

We already do this for initialize(), fix
it so that update() is parallel with the
UI thread as well.

Shaves ~7ms off of the 99th percentile on
NotificationShade open & close

Change-Id: I1791df495453fb9e1e12362c68e3d20e837e62be

core/java/android/view/ThreadedRenderer.java

@@ -519,16 +519,6 @@ public final class ThreadedRenderer {
         }
     }
 
-    /**
-     * This method should be invoked whenever the current hardware renderer
-     * context should be reset.
-     *
-     * @param surface The surface to hardware accelerate
-     */
-    void invalidate(Surface surface) {
-        updateSurface(surface);
-    }
-
     /**
      * Detaches the layer's surface texture from the GL context and releases
      * the texture id

libs/hwui/renderthread/RenderProxy.cpp

@@ -158,7 +158,7 @@ void RenderProxy::updateSurface(const sp<Surface>& surface) {
     SETUP_TASK(updateSurface);
     args->context = mContext;
     args->surface = surface.get();
-    postAndWait(task);
+    post(task);
 }
 
 CREATE_BRIDGE2(pauseSurface, CanvasContext* context, Surface* surface) {