Release MediaFrameworkTest wakelock in onPause

onStop might not be called, so make sure to do this in onPause.

Bug 6300860

Change-Id: If2146a2d7d01c30723d13bfdbc5f98c11767c68d
diff --git a/tests/tests/mediastress/src/android/mediastress/cts/MediaFrameworkTest.java b/tests/tests/mediastress/src/android/mediastress/cts/MediaFrameworkTest.java
index b8c67e4..867da46 100644
--- a/tests/tests/mediastress/src/android/mediastress/cts/MediaFrameworkTest.java
+++ b/tests/tests/mediastress/src/android/mediastress/cts/MediaFrameworkTest.java
@@ -61,12 +61,17 @@
         //Acquire the full wake lock to keep the device up
         PowerManager pm = (PowerManager) this.getSystemService(Context.POWER_SERVICE);
         mWakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, "MediaFrameworkTest");
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
         mWakeLock.acquire();
     }
 
-    public void onStop(Bundle icicle) {
-        mWakeLock.release();
+    public void onPause(Bundle icicle) {
         super.onStop();
+        mWakeLock.release();
     }
 
     public void surfaceDestroyed(SurfaceHolder holder) {