Fix ENABLE_SWIFTSHADER flag.

chrome/browser/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/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 1419 matching lines @@
     "//third_party/zlib:compression_utils",
     "//third_party/zlib:minizip",
     "//third_party/zlib:zip",
     "//ui/base",
     "//ui/base:ui_data_pack",
     "//ui/base/ime",
     "//ui/events:events_base",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
+    "//ui/gl:gl_features",
     "//ui/message_center",
     "//ui/resources",
     "//ui/resources",
     "//ui/shell_dialogs",
     "//ui/strings",
     "//ui/surface",
     "//ui/web_dialogs",
     "//v8",
   ]
   data_deps = []
@@ skipping 2776 matching lines @@
   # linking all of the test support.
   static_library("pepper_cdm_test_constants") {
     testonly = true
     visibility = [ "//chrome/*" ]
     sources = [
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }