Merge changes I689cb0c0,I09603218

* changes:
  Add a 'release' method to the SurfaceTexture public Java API
  Mark Window-Manager-specific APIs on android.view.Surface as @hide

libs/gui/SurfaceTexture.cpp

@@ -910,6 +910,7 @@ void SurfaceTexture::abandon() {
     Mutex::Autolock lock(mMutex);
     freeAllBuffers();
     mAbandoned = true;
+    mCurrentTextureBuf.clear();
     mDequeueCondition.signal();
 }