DO NOT MERGE Removing title bar to prevent false CTS failure on DisplayRefreshRateTest

Some HW (especially ones without HW composer) is too slow to draw frames at refresh rate if titlebar exists.
This change affects GLSurfaceViewTest, CameraGLTest and DisplayRefreshRateTest which uses GLSurfaceViewStubActivity class.
I verified the removal of the titlebar doesn't cause any false CTS failure on these tests.

bug:11425628
cherry-picked from https://googleplex-android-review.git.corp.google.com/#/c/395812/

Change-Id: Ifac05bfeea54e815914ae1dab00b587b2fc96f79