Add support for taking partial screenshot using touch

ash/ash.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': {
     'chromium_code': 1,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
   'includes': [
@@ skipping 644 matching lines @@
         'tooltips/tooltip_controller_unittest.cc',
         'wm/activation_controller_unittest.cc',
         'wm/ash_activation_controller_unittest.cc',
         'wm/ash_native_cursor_manager_unittest.cc',
         'wm/base_layout_manager_unittest.cc',
         'wm/custom_frame_view_ash_unittest.cc',
         'wm/drag_window_resizer_unittest.cc',
         'wm/frame_painter_unittest.cc',
         'wm/panels/panel_layout_manager_unittest.cc',
         'wm/panels/panel_window_resizer_unittest.cc',
+        'wm/partial_screenshot_view_unittest.cc',
         'wm/power_button_controller_unittest.cc',
         'wm/screen_dimmer_unittest.cc',
         'wm/session_state_controller_impl2_unittest.cc',
         'wm/stacking_controller_unittest.cc',
         'wm/system_gesture_event_filter_unittest.cc',
         'wm/system_modal_container_layout_manager_unittest.cc',
         'wm/toplevel_window_event_handler_unittest.cc',
         'wm/user_activity_detector_unittest.cc',
         'wm/video_detector_unittest.cc',
         'wm/window_animations_unittest.cc',
@@ skipping 143 matching lines @@
             'shell/cocoa/app-Info.plist',
           ],
           'xcode_settings': {
             'INFOPLIST_FILE': 'shell/cocoa/app-Info.plist',
           },
         }],
       ],
     },
   ],
 }