Use stub GL draw/clear calls for browser tests that do not need pixels.

content/browser/media/media_browsertest.h

 // 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.
 
 #ifndef CONTENT_BROWSER_MEDIA_MEDIA_BROWSERTEST_H_
 #define CONTENT_BROWSER_MEDIA_MEDIA_BROWSERTEST_H_
 
 #include <utility>
 #include <vector>
 
 #include "content/test/content_browser_test.h"
 
 namespace content {
 
 class TitleWatcher;
 
 // Class used to automate running media related browser tests. The functions
 // assume that media files are located under files/media/ folder known to
 // the test http server.
 class MediaBrowserTest : public ContentBrowserTest {
  public:
   typedef std::pair<const char*, const char*> StringPair;
 
   // Common test results.
   static const char kEnded[];
   static const char kError[];
   static const char kFailed[];
 
-  virtual void SetUp() OVERRIDE;
-
   // Runs a html page with a list of URL query parameters.
   // If http is true, the test starts a local http test server to load the test
   // page, otherwise a local file URL is loaded inside the content shell.
   // It uses RunTest() to check for expected test output.
   void RunMediaTestPage(const char* html_page,
                         std::vector<StringPair>* query_params,
                         const char* expected, bool http);
 
   // Opens a URL and waits for the document title to match either one of the
   // default strings or the expected string.
   void RunTest(const GURL& gurl, const char* expected);
 
   virtual void AddWaitForTitles(content::TitleWatcher* title_watcher);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_MEDIA_BROWSERTEST_H_