Make //gpu/* pass gn check (and make it gn checked).

gpu/command_buffer/common/gles2_cmd_utils.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.
 
 // This file is here so other GLES2 related files can have a common set of
 // includes where appropriate.
 
 #include <sstream>
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 #include <GLES3/gl3.h>
 
 #include "base/numerics/safe_math.h"
-#include "gpu/command_buffer/common/gles2_cmd_format.h"
+//#include "gpu/command_buffer/common/gles2_cmd_format.h"

[kulakowski, 2016/01/15 19:30:12]

Any reason to leave it commented out rather than deleted?

 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 
 namespace gpu {
 namespace gles2 {
 
 namespace gl_error_bit {
 enum GLErrorBit {
   kNoError = 0,
   kInvalidEnum = (1 << 0),
   kInvalidValue = (1 << 1),
@@ skipping 1072 matching lines @@
   }
 
   return true;
 }
 
 #include "gpu/command_buffer/common/gles2_cmd_utils_implementation_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu