Refactor DrawTextureQuad and CheckPixels in gl_tests util

gpu/command_buffer/tests/gl_cube_map_texture_unittest.cc

Index: gpu/command_buffer/tests/gl_cube_map_texture_unittest.cc
diff --git a/gpu/command_buffer/tests/gl_cube_map_texture_unittest.cc b/gpu/command_buffer/tests/gl_cube_map_texture_unittest.cc
index 96d0e46364f959082e12b3bc76b844c79dc089aa..eab89b159af25fcd88a1b4efb336976f774ba9fa 100644
--- a/gpu/command_buffer/tests/gl_cube_map_texture_unittest.cc
+++ b/gpu/command_buffer/tests/gl_cube_map_texture_unittest.cc
@@ -110,7 +110,7 @@ TEST_P(GLCubeMapTextureTest, ReadPixels) {
   EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
             glCheckFramebufferStatus(GL_FRAMEBUFFER));
 
-  GLTestHelper::CheckPixels(0, 0, width_, width_, 0, pixels_);
+  GLTestHelper::CheckPixels(0, 0, width_, width_, 0, pixels_, nullptr);
   EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
 }