Refactor DrawTextureQuad and CheckPixels in gl_tests util

gpu/command_buffer/tests/gl_gpu_memory_buffer_unittest.cc

 // Copyright 2014 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/gl2chromium.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 #include <stdint.h>
 
@@ skipping 216 matching lines @@
   glUniform1i(sampler_location, 0);
 
   GLuint vbo =
       GLTestHelper::SetupUnitQuad(glGetAttribLocation(program, "a_position"));
   ASSERT_NE(0u, vbo);
   glViewport(0, 0, kImageWidth, kImageHeight);
   glDrawArrays(GL_TRIANGLES, 0, 6);
   ASSERT_TRUE(glGetError() == GL_NO_ERROR);
 
   // Check if pixels match the values that were assigned to the mapped buffer.
-  GLTestHelper::CheckPixels(0, 0, kImageWidth, kImageHeight, 0, pixel);
+  GLTestHelper::CheckPixels(0, 0, kImageWidth, kImageHeight, 0, pixel, nullptr);
   EXPECT_TRUE(GL_NO_ERROR == glGetError());
 
   // Release the image.
   glReleaseTexImage2DCHROMIUM(GL_TEXTURE_2D, image_id);
 
   // Clean up.
   glDeleteProgram(program);
   glDeleteShader(vertex_shader);
   glDeleteShader(fragment_shader);
   glDeleteBuffers(1, &vbo);
   glDestroyImageCHROMIUM(image_id);
   glDeleteTextures(1, &texture_id);
 }
 
 INSTANTIATE_TEST_CASE_P(GpuMemoryBufferTests,
                         GpuMemoryBufferTest,
                         ::testing::Values(gfx::BufferFormat::R_8,
                                           gfx::BufferFormat::BGR_565,
                                           gfx::BufferFormat::RGBA_4444,
                                           gfx::BufferFormat::RGBA_8888,
                                           gfx::BufferFormat::BGRA_8888));
 
 }  // namespace gles2
 }  // namespace gpu