Use the same interrupt/resume logic for all functor calls

bug:7093396

The functor was able to change the renderer's blend mode without it
being restored in process mode. This single path of updating gl caches
reduces likelihood of this occurring in the future.

Change-Id: Ie367532f9c683299f02bc4f635d7cb31f96db39f

libs/hwui/OpenGLRenderer.cpp

@@ -339,6 +339,7 @@ status_t OpenGLRenderer::invokeFunctors(Rect& dirty) {
     size_t count = mFunctors.size();
 
     if (count > 0) {
+        interrupt();
         SortedVector<Functor*> functors(mFunctors);
         mFunctors.clear();
 
@@ -365,10 +366,7 @@ status_t OpenGLRenderer::invokeFunctors(Rect& dirty) {
                 mFunctors.add(f);
             }
         }
-        // protect against functors binding to other buffers
-        mCaches.unbindMeshBuffer();
-        mCaches.unbindIndicesBuffer();
-        mCaches.activeTexture(0);
+        resume();
     }
 
     return result;