Support double-tap to click in touch accessibility controller.

ui/ui_unittests.gyp

 # Copyright 2013 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 200 matching lines @@
           'sources!': [
             'gfx/canvas_unittest.cc',
             'gfx/render_text_unittest.cc',
           ],
         }],
         ['chromeos==1', {
           'dependencies': [
             '../chromeos/chromeos.gyp:chromeos',
             'aura/aura.gyp:aura_test_support',
             'chromeos/ui_chromeos.gyp:ui_chromeos',
+            'events/events.gyp:gesture_detection',
           ],
           'sources': [
             'chromeos/touch_exploration_controller_unittest.cc'
           ],
           'sources!': [
             'base/dragdrop/os_exchange_data_provider_aurax11_unittest.cc',
           ],
         }],
       ],
       'target_conditions': [
@@ skipping 31 matching lines @@
           ],
           'variables': {
             'test_suite_name': 'ui_unittests',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }