Allow taking screen shot of a non child window which has delegate to paint.

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.cc',
@@ skipping 501 matching lines @@
       'touch/touch_hud_projection.cc',
       'touch/touch_hud_projection.h',
       'touch/touch_observer_hud.cc',
       'touch/touch_observer_hud.h',
       'touch/touch_transformer_controller.cc',
       'touch/touch_transformer_controller.h',
       'touch/touch_uma.cc',
       'touch/touch_uma.h',
       'touch/touchscreen_util.cc',
       'touch/touchscreen_util.h',
-      'utility/partial_screenshot_controller.cc',
-      'utility/partial_screenshot_controller.h',
+      'utility/screenshot_controller.cc',
+      'utility/screenshot_controller.h',
       'virtual_keyboard_controller.cc',
       'virtual_keyboard_controller.h',
       'volume_control_delegate.h',
       'wm/ash_focus_rules.cc',
       'wm/ash_focus_rules.h',
       'wm/ash_native_cursor_manager.cc',
       'wm/ash_native_cursor_manager.h',
       'wm/aura/aura_layout_manager_adapter.cc',
       'wm/aura/aura_layout_manager_adapter.h',
       'wm/aura/wm_globals_aura.cc',
@@ skipping 410 matching lines @@
       'system/tray/tray_details_view_unittest.cc',
       'system/user/tray_user_unittest.cc',
       'system/web_notification/ash_popup_alignment_delegate_unittest.cc',
       'system/web_notification/web_notification_tray_unittest.cc',
       'test/ash_test_helper_unittest.cc',
       'test/ash_unittests.cc',
       'tooltips/tooltip_controller_unittest.cc',
       'touch/touch_observer_hud_unittest.cc',
       'touch/touch_transformer_controller_unittest.cc',
       'touch/touchscreen_util_unittest.cc',
-      'utility/partial_screenshot_controller_unittest.cc',
+      'utility/screenshot_controller_unittest.cc',
       'virtual_keyboard_controller_unittest.cc',
       'wm/always_on_top_controller_unittest.cc',
       'wm/ash_focus_rules_unittest.cc',
       'wm/ash_native_cursor_manager_unittest.cc',
       'wm/dock/docked_window_layout_manager_unittest.cc',
       'wm/dock/docked_window_resizer_unittest.cc',
       'wm/drag_window_resizer_unittest.cc',
       'wm/gestures/overview_gesture_handler_unittest.cc',
       'wm/immersive_fullscreen_controller_unittest.cc',
       'wm/lock_layout_manager_unittest.cc',
@@ skipping 455 matching lines @@
                   '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
                 ],
               }
             ],
           ],
         },
       ],
     }],
   ],
 }