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.

Change-Id: Ifac05bfeea54e815914ae1dab00b587b2fc96f79
diff --git a/tests/src/android/opengl/cts/GLSurfaceViewStubActivity.java b/tests/src/android/opengl/cts/GLSurfaceViewStubActivity.java
index 79da413..85ad172 100644
--- a/tests/src/android/opengl/cts/GLSurfaceViewStubActivity.java
+++ b/tests/src/android/opengl/cts/GLSurfaceViewStubActivity.java
@@ -19,6 +19,7 @@
 import android.app.Activity;
 import android.opengl.GLSurfaceView;
 import android.os.Bundle;
+import android.view.Window;
 
 import javax.microedition.khronos.egl.EGLConfig;
 import javax.microedition.khronos.opengles.GL10;
@@ -100,6 +101,7 @@
         if (mRenderModeSet) {
             mView.setRenderMode(mRenderMode);
         }
+        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
         setContentView(mView);
     }