Refactor DrawTextureQuad and CheckPixels in gl_tests util

gpu/command_buffer/tests/gl_ext_srgb_unittest.cc

 // Copyright (c) 2015 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 <stdint.h>
 
 #include "gpu/command_buffer/tests/gl_manager.h"
 #include "gpu/command_buffer/tests/gl_test_utils.h"
@@ skipping 48 matching lines @@
   EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
   glBindTexture(GL_TEXTURE_2D, 0);
   GLuint fbo = 0;
   glGenFramebuffers(1, &fbo);
   glBindFramebuffer(GL_FRAMEBUFFER, fbo);
   glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
                          tex, 0);
   EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
             glCheckFramebufferStatus(GL_FRAMEBUFFER));
 
-  GLTestHelper::CheckPixels(0, 0, kSubImageX, kHeight, 0, kImageColor);
-  GLTestHelper::CheckPixels(0, 0, kWidth, kSubImageY, 0, kImageColor);
+  GLTestHelper::CheckPixels(0, 0, kSubImageX, kHeight, 0, kImageColor, nullptr);
+  GLTestHelper::CheckPixels(0, 0, kWidth, kSubImageY, 0, kImageColor, nullptr);
   GLTestHelper::CheckPixels(kSubImageX, kSubImageY, kSubImageWidth,
-                            kSubImageHeight, 0, kSubImageColor);
+                            kSubImageHeight, 0, kSubImageColor, nullptr);
 }
 
 }  // namespace gpu