Try to let gles2_conform tests build with -Wall.

gpu/gles2_conform_support/gles2_conform_test.gyp

 # Copyright (c) 2013 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.
 
 {
 
   'includes': [
     'gles2_conform.gypi',
   ],
   'target_defaults': {
     'msvs_disabled_warnings': [4005, 4013, 4018, 4101, 4716],
      'include_dirs': [
        '<(SHARED_INTERMEDIATE_DIR)/gles2_conform_test_embedded_data',
        '../../third_party/gles2_conform/GTF_ES/glsl/GTF/Source',
      ],
+     'variables': {
+       'clang_warning_flags': [
+         # GTFVecBase.h contains static no-inline functions in a header :-/
+         '-Wno-unused-function',
+       ],
+     },
   },
   'targets': [
     {
       'target_name': 'gles2_conform_test',
       'type': 'executable',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/gpu/gpu.gyp:gpu',
         '<(DEPTH)/testing/gtest.gyp:gtest',
       ],
@@ skipping 225 matching lines @@
     }],
   ],
 }
 
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: