Ensure GL initialization only happens once, and provide common init path

chrome/browser/media/chrome_webrtc_video_quality_browsertest.cc

 // 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.
 
 #include "base/environment.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/process/launch.h"
 #include "base/strings/string_split.h"
 #include "base/strings/stringprintf.h"
@@ skipping 12 matching lines @@
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "chrome/test/ui/ui_test.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/test/browser_test_utils.h"
 #include "media/base/media_switches.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 #include "net/test/python_utils.h"
 #include "testing/perf/perf_test.h"
+#include "ui/gl/gl_switches.h"
 
 static const base::FilePath::CharType kFrameAnalyzerExecutable[] =
 #if defined(OS_WIN)
     FILE_PATH_LITERAL("frame_analyzer.exe");
 #else
     FILE_PATH_LITERAL("frame_analyzer");
 #endif
 
 static const base::FilePath::CharType kArgbToI420ConverterExecutable[] =
 #if defined(OS_WIN)
@@ skipping 323 matching lines @@
 
   RunARGBtoI420Converter(
       kVgaWidth, kVgaHeight, GetWorkingDir().Append(kCapturedYuvFileName));
   ASSERT_TRUE(
       CompareVideosAndPrintResult(kVgaWidth,
                                   kVgaHeight,
                                   GetWorkingDir().Append(kCapturedYuvFileName),
                                   GetWorkingDir().Append(kReferenceYuvFileName),
                                   GetWorkingDir().Append(kStatsFileName)));
 }