Add Monkey protection

    Bug: 5577443

Change-Id: I61f59ec5e65de0b59890804f2fb0eb7ab182326d
diff --git a/src/com/android/browser/PhoneUi.java b/src/com/android/browser/PhoneUi.java
index a13eca3..37d0b34 100644
--- a/src/com/android/browser/PhoneUi.java
+++ b/src/com/android/browser/PhoneUi.java
@@ -332,7 +332,9 @@
             mAnimScreen.setScaleFactor(1f);
         }
         mAnimScreen.set(getTitleBar(), getWebView());
-        mCustomViewContainer.addView(mAnimScreen.mMain, COVER_SCREEN_PARAMS);
+        if (mAnimScreen.mMain.getParent() == null) {
+            mCustomViewContainer.addView(mAnimScreen.mMain, COVER_SCREEN_PARAMS);
+        }
         mCustomViewContainer.setVisibility(View.VISIBLE);
         mCustomViewContainer.bringToFront();
         mAnimScreen.mMain.layout(0, 0, mContentView.getWidth(),