Implement FlushCaches TODO

Change-Id: Id05429e98ffe0858275b32c41fb215c1d8d930b2
diff --git a/libs/hwui/renderthread/CanvasContext.h b/libs/hwui/renderthread/CanvasContext.h
index a54b33e..da85d448 100644
--- a/libs/hwui/renderthread/CanvasContext.h
+++ b/libs/hwui/renderthread/CanvasContext.h
@@ -63,6 +63,8 @@
 
     bool copyLayerInto(DeferredLayerUpdater* layer, SkBitmap* bitmap);
 
+    void flushCaches(Caches::FlushMode flushMode);
+
     void invokeFunctor(Functor* functor);
 
     void runWithGlContext(RenderTask* task);