Added switch to disable specified GL extensions.

build/all.gyp

 # 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.
 
 {
   'variables': {
     # A hook that can be overridden in other repositories to add additional
     # compilation targets to 'All'.
     'app_targets%': [],
     # For Android-specific targets.
@@ skipping 301 matching lines @@
         '../base/base.gyp:base_unittests',
         '../components/components_tests.gyp:components_unittests',
         '../crypto/crypto.gyp:crypto_unittests',
         '../net/net.gyp:net_unittests',
         '../skia/skia_tests.gyp:skia_unittests',
         '../sql/sql.gyp:sql_unittests',
         '../sync/sync.gyp:sync_unit_tests',
         '../ui/base/ui_base_tests.gyp:ui_base_unittests',
         '../ui/display/display.gyp:display_unittests',
         '../ui/gfx/gfx_tests.gyp:gfx_unittests',
-        '../ui/gl/gl_tests.gyp:gl_unittests',
         '../url/url.gyp:url_unittests',
       ],
       'conditions': [
+        ['OS!="ios"', {
+          'dependencies': [
+            '../ui/gl/gl_tests.gyp:gl_unittests',
+          ],
+        }],
         ['OS!="ios" and OS!="mac"', {
           'dependencies': [
             '../ui/touch_selection/ui_touch_selection.gyp:ui_touch_selection_unittests',
           ],
         }],
         ['OS!="ios" and OS!="android"', {
           'dependencies': [
             '../cc/blink/cc_blink_tests.gyp:cc_blink_unittests',
             '../cc/cc_tests.gyp:cc_unittests',
             '../cloud_print/cloud_print.gyp:cloud_print_unittests',
@@ skipping 1064 matching lines @@
           'dependencies': [
             '../ui/views/examples/examples.gyp:views_examples_with_content_exe',
             '../ui/views/views.gyp:views',
             '../ui/views/views.gyp:views_unittests',
           ],
         },  # target_name: macviews_builder
       ],  # targets
     }],  # os=='mac' and toolkit_views==1
   ],  # conditions
 }