[Android WebView] API to enable fullscreen.

android_webview/javatests/src/org/chromium/android_webview/test/FullScreenVideoTestAwContentsClient.java

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.android_webview.test;
 
 import android.app.Activity;
 import android.view.Gravity;
 import android.view.View;
 import android.view.ViewGroup;
@@ skipping 47 matching lines @@
     }
 
     public WebChromeClient.CustomViewCallback getExitCallback() {
         return mExitCallback;
     }
 
     public View getCustomView() {
         return mCustomView;
     }
 
+    public boolean wasCustomViewShownCalled() {
+        return mOnShowCustomViewCallbackHelper.getCallCount() > 0;
+    }
+
     public void waitForCustomViewShown() throws TimeoutException, InterruptedException {
         mOnShowCustomViewCallbackHelper.waitForCallback(0, 1, WAITING_SECONDS, TimeUnit.SECONDS);
     }
 
     public void waitForCustomViewHidden() throws InterruptedException, TimeoutException {
         mOnHideCustomViewCallbackHelper.waitForCallback(0, 1, WAITING_SECONDS, TimeUnit.SECONDS);
     }
 }