Allow the user to cancel the capture region action, and show its active status in the tray.

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,
     # These files lists are shared with the GN build.
     'ash_sources': [
       'accelerators/accelerator_commands_aura.cc',
@@ skipping 227 matching lines @@
       'common/system/chromeos/palette/palette_ids.cc',
       'common/system/chromeos/palette/palette_ids.h',
       'common/system/chromeos/palette/palette_tool.cc',
       'common/system/chromeos/palette/palette_tool.h',
       'common/system/chromeos/palette/palette_tool_manager.cc',
       'common/system/chromeos/palette/palette_tool_manager.h',
       'common/system/chromeos/palette/palette_tray.cc',
       'common/system/chromeos/palette/palette_tray.h',
       'common/system/chromeos/palette/palette_utils.cc',
       'common/system/chromeos/palette/palette_utils.h',
-      'common/system/chromeos/palette/tools/capture_region_action.cc',
-      'common/system/chromeos/palette/tools/capture_region_action.h',
+      'common/system/chromeos/palette/tools/capture_region_mode.cc',
+      'common/system/chromeos/palette/tools/capture_region_mode.h',
       'common/system/chromeos/palette/tools/capture_screen_action.cc',
       'common/system/chromeos/palette/tools/capture_screen_action.h',
       'common/system/chromeos/palette/tools/create_note_action.cc',
       'common/system/chromeos/palette/tools/create_note_action.h',
       'common/system/chromeos/palette/tools/magnifier_mode.cc',
       'common/system/chromeos/palette/tools/magnifier_mode.h',
       'common/system/chromeos/power/battery_notification.cc',
       'common/system/chromeos/power/battery_notification.h',
       'common/system/chromeos/power/dual_role_notification.cc',
       'common/system/chromeos/power/dual_role_notification.h',
@@ skipping 1255 matching lines @@
                   '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
                 ],
               }
             ],
           ],
         },
       ],
     }],
   ],
 }