[aw] Software mode tests for fullscreen API.

android_webview/java/src/org/chromium/android_webview/AwContentViewClient.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;
 
 import android.content.Context;
 import android.view.KeyEvent;
 import android.view.View;
 import android.webkit.URLUtil;
@@ skipping 48 matching lines @@
     }
 
     @Override
     public boolean shouldBlockMediaRequest(String url) {
         return mAwSettings != null
                 ? mAwSettings.getBlockNetworkLoads() && URLUtil.isNetworkUrl(url) : true;
     }
 
     @Override
     public void enterFullscreenVideo(View videoView) {
-        // enterFullscreenVideo will only be called after enterFullscreen.
-        assert mCustomView != null;
+        if (mCustomView == null) {
+            // enterFullscreenVideo will only be called after enterFullscreen, but
+            // in this case exitFullscreen has been invoked in between them.
+            // TODO(igsolla): Fix http://crbug/425926 and replace with assert.
+            return;
+        }
         mCustomView.addView(videoView, 0);
     }
 
     @Override
     public void exitFullscreenVideo() {
         // Intentional no-op
     }
 
     @Override
     public View getVideoLoadingProgressView() {
@@ skipping 31 matching lines @@
      * Called to show the web contents in embedded mode.
      */
     public void exitFullscreen() {
         if (mCustomView != null) {
             mAwContents.exitFullScreen();
             mAwContentsClient.onHideCustomView();
             mCustomView = null;
         }
     }
 }