mash: Migrate tray IME view to wm common types, move to //ash/common

ash/ash.gyp

Index: ash/ash.gyp
diff --git a/ash/ash.gyp b/ash/ash.gyp
index 9d2bc6953bf9fecacf3ecac991ea3ee2a6e1d3e9..f18afcb33082685518554d731f445b1aeb688a09 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -118,6 +118,7 @@
       'common/system/chromeos/shutdown_policy_observer.h',
       'common/system/chromeos/system_clock_observer.cc',
       'common/system/chromeos/system_clock_observer.h',
+      'common/system/chromeos/virtual_keyboard/virtual_keyboard_observer.h',
       'common/system/date/clock_observer.h',
       'common/system/date/date_default_view.cc',
       'common/system/date/date_default_view.h',
@@ -125,6 +126,9 @@
       'common/system/date/date_view.h',
       'common/system/date/tray_date.cc',
       'common/system/date/tray_date.h',
+      'common/system/ime/ime_observer.h',
+      'common/system/ime/tray_ime_chromeos.cc',
+      'common/system/ime/tray_ime_chromeos.h',
       'common/system/networking_config_delegate.cc',
       'common/system/networking_config_delegate.h',
       'common/system/system_notifier.cc',
@@ -570,12 +574,8 @@
       'system/chromeos/tray_display.h',
       'system/chromeos/tray_tracing.cc',
       'system/chromeos/tray_tracing.h',
-      'system/chromeos/virtual_keyboard/virtual_keyboard_observer.h',
       'system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc',
       'system/chromeos/virtual_keyboard/virtual_keyboard_tray.h',
-      'system/ime/ime_observer.h',
-      'system/ime/tray_ime_chromeos.cc',
-      'system/ime/tray_ime_chromeos.h',
       'system/keyboard_brightness/keyboard_brightness_control_delegate.h',
       'system/locale/locale_notification_controller.cc',
       'system/locale/locale_notification_controller.h',
@@ -903,6 +903,7 @@
       'common/system/chromeos/power/power_status_view_unittest.cc',
       'common/system/chromeos/power/tray_power_unittest.cc',
       'common/system/date/date_view_unittest.cc',
+      'common/system/ime/tray_ime_chromeos_unittest.cc',
       'common/system/tray/tray_details_view_unittest.cc',
       'common/system/update/tray_update_unittest.cc',
       'content/display/screen_orientation_controller_chromeos_unittest.cc',
@@ -968,7 +969,6 @@
       'system/chromeos/session/tray_session_length_limit_unittest.cc',
       'system/chromeos/supervised/tray_supervised_user_unittest.cc',
       'system/chromeos/tray_display_unittest.cc',
-      'system/ime/tray_ime_chromeos_unittest.cc',
       'system/overview/overview_button_tray_unittest.cc',
       'system/toast/toast_manager_unittest.cc',
       'system/tray/media_security/multi_profile_media_tray_item_unittest.cc',