Add GLSurfaceView pause/resume tests to CTS.

This change adds two new tests that repeatedly call the onPause() and
onResume() methods of a GLSurfaceView object.  One of the tests has a delay
between the pause/resume and runs fewer iterations, while the other test has no
delay and runs more iterations.

These tests simply verify that the system is able to perform multiple
pause/resume sequences without crashing.

Bug: 2550745

Change-Id: I276db62dc4ff7539392ee55e52ab20057d0b3d1e
diff --git a/tests/AndroidManifest.xml b/tests/AndroidManifest.xml
index 4bf8239..6eb1302 100644
--- a/tests/AndroidManifest.xml
+++ b/tests/AndroidManifest.xml
@@ -903,6 +903,9 @@
                        android:resource="@xml/authenticator" />
         </service>
 
+        <activity android:name="android.opengl.cts.GLSurfaceViewStubActivity"
+                  android:label="GLSurfaceViewStub"/>
+
     </application>
 
     <!--Test for PackageManager, please put this at the very beginning-->