Added switch to disable specified GL extensions.

ui/gfx/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 224 matching lines @@
     ":gfx_export",
     "//base",
     "//base:i18n",
     "//base:base_static",
     "//base/third_party/dynamic_annotations",
     "//skia",
     "//third_party/harfbuzz-ng",
     "//third_party/libpng",
     "//third_party/zlib",
     "//ui/gfx/geometry",
+    "//ui/gl",
   ]
   public_deps = [
     "//base",
     "//skia",
     "//third_party/icu",
   ]
 
   # Text rendering conditions (complicated so separated out).
   if (is_android || is_ios) {
     # We don't support RenderText on these platforms.
@@ skipping 132 matching lines @@
       "test/ui_cocoa_test_helper.mm",
     ]
   }
   if (is_linux) {
     configs += [ "//build/config/linux:fontconfig" ]
   }
 }
 
 test("gfx_unittests") {
   sources = [
+    "//ui/gl/gl_api_unittest.cc",

[no sievers, 2015/05/01 21:55:00]

nit: maybe we can also treat these ui/gl unittest sources as a different set
here?

[David Yen, 2015/05/01 22:34:38]

GN has much stricter gfx -> gl dependency rules so I am not sure if it is
possible... I just removed this change.

     "font_render_params_linux_unittest.cc",
     "font_unittest.cc",
     "image/image_family_unittest.cc",
     "image/image_ios_unittest.mm",
     "image/image_skia_unittest.cc",
     "image/image_unittest.cc",
     "platform_font_linux_unittest.cc",
     "screen_unittest.cc",
     "test/run_all_unittests.cc",
     "text_elider_unittest.cc",
@@ skipping 59 matching lines @@
     ":test_support",
     "//base",
     "//base/test:test_support",
     "//skia",
     "//third_party/icu:icuuc",
     "//third_party/libpng",
     "//third_party/zlib",
     "//testing/gtest",
     "//ui/base",
     "//ui/gfx/geometry",
+    "//ui/gl",
     "//ui/resources:ui_test_pak",
   ]
 
   if (!is_mac && !is_ios) {
     sources += [
       "interpolated_transform_unittest.cc",
       "transform_unittest.cc",
     ]
   }
 
@@ skipping 42 matching lines @@
 if (is_android) {
   generate_jni("gfx_jni_headers") {
     sources = [
       "../android/java/src/org/chromium/ui/gfx/BitmapHelper.java",
       "../android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java",
       "../android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java",
     ]
     jni_package = "gfx"
   }
 }