Fix white flash screen on pressing home key.

Change-Id: I08c748caf6d2f1cb6693d89af4dbccf091f1f45f
diff --git a/src/com/android/browser/BrowserActivity.java b/src/com/android/browser/BrowserActivity.java
index 8569550..a6c5602 100644
--- a/src/com/android/browser/BrowserActivity.java
+++ b/src/com/android/browser/BrowserActivity.java
@@ -223,10 +223,22 @@
     }
 
     protected void handleOnResume() {
+        // Note: Intentionally left blank.
+    }
+
+    protected void handleOnStart() {
         mController.onResume();
     }
 
     @Override
+    protected void onStop() {
+        mEngineInitializer.onActivityStop();
+        super.onStop();
+        // Note: Do not add any more application logic in this method.
+        //       Move any additional app logic into handleOnStop().
+    }
+
+    @Override
     public boolean onMenuOpened(int featureId, Menu menu) {
         if (Window.FEATURE_OPTIONS_PANEL == featureId) {
             mController.onMenuOpened(featureId, menu);
@@ -267,6 +279,10 @@
     }
 
     protected void handleOnPause() {
+        // Note: Intentionally left blank
+    }
+
+    protected void handleOnStop() {
         mController.onPause();
     }