Refactor so chromium only GL extensions require gl2extchromium.h

gpu/command_buffer/tests/gl_lose_context_chromium_unittests.cc

 // Copyright (c) 2012 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 <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
+#include <GLES2/gl2extchromium.h>
 
 #include "base/logging.h"
 #include "gpu/command_buffer/tests/gl_manager.h"
 #include "gpu/command_buffer/tests/gl_test_utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gpu {
 
 class GLLoseContextTest : public testing::Test {
@@ skipping 37 matching lines @@
   // Expect the read will fail.
   EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, 1, 1, 0, expected_no_draw));
   gl2_.MakeCurrent();
   uint8 expected_draw[] = { 0, 0, 0, 0, };
   // Expect the read will succeed.
   EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, 1, 1, 0, expected_draw));
 }
 
 }  // namespace gpu