mash: Migrate [Keyboard]Brightness code to ash/common.

ash/ash.gyp

Index: ash/ash.gyp
diff --git a/ash/ash.gyp b/ash/ash.gyp
index d2dce7d8e1515fc0bafbb6fdde1620497897c942..1cb74aaf85a953f8c2493e9c90edb905956a1bca 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -114,6 +114,7 @@
       'common/system/audio/tray_audio_delegate.h',
       'common/system/audio/volume_view.cc',
       'common/system/audio/volume_view.h',
+      'common/system/brightness_control_delegate.h',
       'common/system/cast/tray_cast.cc',
       'common/system/cast/tray_cast.h',
       'common/system/chromeos/audio/audio_detailed_view.cc',
@@ -127,11 +128,17 @@
       'common/system/chromeos/bluetooth/bluetooth_observer.h',
       'common/system/chromeos/bluetooth/tray_bluetooth.cc',
       'common/system/chromeos/bluetooth/tray_bluetooth.h',
+      'common/system/chromeos/brightness/brightness_controller_chromeos.cc',
+      'common/system/chromeos/brightness/brightness_controller_chromeos.h',
+      'common/system/chromeos/brightness/tray_brightness.cc',
+      'common/system/chromeos/brightness/tray_brightness.h',
       'common/system/chromeos/devicetype_utils.cc',
       'common/system/chromeos/devicetype_utils.h',
       'common/system/chromeos/enterprise/enterprise_domain_observer.h',
       'common/system/chromeos/enterprise/tray_enterprise.cc',
       'common/system/chromeos/enterprise/tray_enterprise.h',
+      'common/system/chromeos/keyboard_brightness_controller.cc',
+      'common/system/chromeos/keyboard_brightness_controller.h',
       'common/system/chromeos/media_security/media_capture_observer.h',
       'common/system/chromeos/network/network_detailed_view.h',
       'common/system/chromeos/network/network_observer.h',
@@ -204,6 +211,7 @@
       'common/system/ime/ime_observer.h',
       'common/system/ime/tray_ime_chromeos.cc',
       'common/system/ime/tray_ime_chromeos.h',
+      'common/system/keyboard_brightness_control_delegate.h',
       'common/system/locale/locale_notification_controller.cc',
       'common/system/locale/locale_notification_controller.h',
       'common/system/locale/locale_observer.h',
@@ -612,13 +620,6 @@
       'sticky_keys/sticky_keys_overlay.cc',
       'sticky_keys/sticky_keys_overlay.h',
       'sticky_keys/sticky_keys_state.h',
-      'system/brightness_control_delegate.h',
-      'system/chromeos/brightness/brightness_controller_chromeos.cc',
-      'system/chromeos/brightness/brightness_controller_chromeos.h',
-      'system/chromeos/brightness/tray_brightness.cc',
-      'system/chromeos/brightness/tray_brightness.h',
-      'system/chromeos/keyboard_brightness_controller.cc',
-      'system/chromeos/keyboard_brightness_controller.h',
       'system/chromeos/media_security/multi_profile_media_tray_item.cc',
       'system/chromeos/media_security/multi_profile_media_tray_item.h',
       'system/chromeos/multi_user/user_switch_util.cc',
@@ -631,7 +632,6 @@
       'system/chromeos/rotation/tray_rotation_lock.h',
       'system/chromeos/tray_display.cc',
       'system/chromeos/tray_display.h',
-      'system/keyboard_brightness/keyboard_brightness_control_delegate.h',
       'system/status_area_widget.cc',
       'system/status_area_widget.h',
       'system/toast/toast_data.cc',
@@ -899,6 +899,7 @@
       'common/material_design/material_design_controller_unittest.cc',
       'common/popup_message_unittest.cc',
       'common/shelf/shelf_model_unittest.cc',
+      'common/system/chromeos/brightness/tray_brightness_unittest.cc',
       'common/system/chromeos/power/power_status_unittest.cc',
       'common/system/chromeos/power/power_status_view_unittest.cc',
       'common/system/chromeos/power/tray_power_unittest.cc',
@@ -963,7 +964,6 @@
       'shell_unittest.cc',
       'sticky_keys/sticky_keys_overlay_unittest.cc',
       'sticky_keys/sticky_keys_unittest.cc',
-      'system/chromeos/brightness/tray_brightness_unittest.cc',
       'system/chromeos/media_security/multi_profile_media_tray_item_unittest.cc',
       'system/chromeos/multi_user/user_switch_util_unittest.cc',
       'system/chromeos/power/power_event_observer_unittest.cc',