Refactor DrawTextureQuad and CheckPixels in gl_tests util

gpu/command_buffer/tests/gl_ext_blend_func_extended_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 <GLES2/gl2extchromium.h>
 #include <GLES3/gl3.h>
 #include <stdint.h>
 
@@ skipping 169 matching lines @@
     glClear(GL_COLOR_BUFFER_BIT);
     glDrawArrays(GL_TRIANGLES, 0, 6);
     EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
     // Verify.
     uint8_t color[4];
     BlendEquationFuncAdd<GL_SRC1_COLOR_EXT, GL_SRC_ALPHA,
                          GL_ONE_MINUS_SRC1_COLOR_EXT,
                          GL_ONE_MINUS_SRC1_ALPHA_EXT>(kDst, kSrc, kSrc1, color);
 
     EXPECT_TRUE(GLTestHelper::CheckPixels(kWidth / 4, (3 * kHeight) / 4, 1, 1,
-                                          1, color));
-    EXPECT_TRUE(GLTestHelper::CheckPixels(kWidth - 1, 0, 1, 1, 1, color));
+                                          1, color, nullptr));
+    EXPECT_TRUE(
+        GLTestHelper::CheckPixels(kWidth - 1, 0, 1, 1, 1, color, nullptr));
   }
 
  protected:
   GLuint program_;
   GLuint position_loc_;
   GLuint src_loc_;
   GLuint src1_loc_;
   GLManager gl_;
 };
 
@@ skipping 480 matching lines @@
 
 INSTANTIATE_TEST_CASE_P(TranslatorVariants,
                         EXTBlendFuncExtendedDrawTest,
                         ::testing::Bool());
 
 INSTANTIATE_TEST_CASE_P(TranslatorVariants,
                         EXTBlendFuncExtendedES3DrawTest,
                         ::testing::Bool());
 
 }  // namespace gpu