add ENABLE_GLES flag for conditional complilation of GLES

build/common.gypi

 # Copyright (c) 2010 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   'variables': {
     # .gyp files or targets should set chromium_code to 1 if they build
@@ skipping 303 matching lines @@
       }],
       # Compute based on OS and target architecture whether the GPU
       # plugin / process is supported.
       [ 'OS=="win" or (OS=="linux" and target_arch!="arm") or OS=="mac"', {
         # Enable a variable used elsewhere throughout the GYP files to determine
         # whether to compile in the sources for the GPU plugin / process.
         'enable_gpu%': 1,
       }, {  # GPU plugin not supported
         'enable_gpu%': 0,
       }],
+      # Compute based on OS, target architecture and device whether GLES
+      # is supported
+      [ 'OS=="linux" and target_arch=="arm" and chromeos==1', {
+        # Enable a variable used elsewhere throughout the GYP files to determine
+        # whether to compile in the sources for the GLES support.
+        'enable_gles%': 1,
+      }, {  # GLES not supported
+        'enable_gles%': 0,
+      }],
     ],
 
     # NOTE: When these end up in the Mac bundle, we need to replace '-' for '_'
     # so Cocoa is happy (http://crbug.com/20441).
     'locales': [
       'am', 'ar', 'bg', 'bn', 'ca', 'cs', 'da', 'de', 'el', 'en-GB',
       'en-US', 'es-419', 'es', 'et', 'fi', 'fil', 'fr', 'gu', 'he',
       'hi', 'hr', 'hu', 'id', 'it', 'ja', 'kn', 'ko', 'lt', 'lv',
       'ml', 'mr', 'nb', 'nl', 'pl', 'pt-BR', 'pt-PT', 'ro', 'ru',
       'sk', 'sl', 'sr', 'sv', 'sw', 'ta', 'te', 'th', 'tr', 'uk',
@@ skipping 64 matching lines @@
           ['OS=="win"', {
             'defines': ['NO_TCMALLOC'],
           }],
         ],
       }],
       ['enable_gpu==1', {
         'defines': [
           'ENABLE_GPU=1',
         ],
       }],
+      ['enable_gles==1', {
+        'defines': [
+          'ENABLE_GLES=1',
+        ],
+      }],
       ['coverage!=0', {
         'conditions': [
           ['OS=="mac"', {
             'xcode_settings': {
               'GCC_INSTRUMENT_PROGRAM_FLOW_ARCS': 'YES',  # -fprofile-arcs
               'GCC_GENERATE_TEST_COVERAGE_FILES': 'YES',  # -ftest-coverage
             },
             # Add -lgcov for types executable, shared_library, and
             # loadable_module; not for static_library.
             # This is a delayed conditional.
@@ skipping 861 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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