Move GL headers from gpu to third_party/khronos

ppapi/native_client/src/shared/ppapi_proxy/ppapi_proxy.gyp

 # Copyright (c) 2011 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': [
     '../../../../../native_client/build/common.gypi',
   ],
   'targets': [
     {
@@ skipping 62 matching lines @@
       'type': 'none',
       'dependencies': [
         '<(DEPTH)/native_client/tools.gyp:prep_toolchain'
       ],
       'variables': {
         'nlib_target': 'libppruntime.a',
         'build_glibc': 0,
         'build_newlib': 1,
         'include_dirs': [
           '<(DEPTH)/gpu',
+          '<(DEPTH)/third_party/khronos',
           '<(DEPTH)/ppapi/native_client/src/shared/ppapi_proxy/untrusted',
         ],
         'sources': [
           '<(DEPTH)/gpu/command_buffer/common/cmd_buffer_common.cc',
           '<(DEPTH)/gpu/command_buffer/common/gles2_cmd_format.cc',
           '<(DEPTH)/gpu/command_buffer/common/gles2_cmd_utils.cc',
           '<(DEPTH)/gpu/command_buffer/common/logging.cc',
 
           '<(DEPTH)/gpu/command_buffer/client/cmd_buffer_helper.cc',
           '<(DEPTH)/gpu/command_buffer/client/fenced_allocator.cc',
@@ skipping 64 matching lines @@
           'utility.cc',
           # Autogenerated files
           'ppp_rpc_server.cc',
           'ppb_rpc_client.cc',
           'upcall_client.cc'
         ],
       },
     },
   ],
 }