Otherwise, there will be NullPointerException.
Fix: 204883084
Test: Run the following code and see if it crashes.
ViewGroup v = new FrameLayout(context);
v.requestTransparentRegion(v);
getWindowManager().addView(v, attrs);
getWindowManager().removeView(v);
Change-Id: I059e13d2a258cf85dbc1694fb79b6088199de3fb