Bluetooth: notify user of incoming pairing requests

ash/ash.gyp

Index: ash/ash.gyp
diff --git a/ash/ash.gyp b/ash/ash.gyp
index 86ca02290612b13a28123df5ee109527b7eb6932..b3136610ec33ce159bc9ba8fdc89dfffab38dce1 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -288,6 +288,8 @@
         'system/chromeos/audio/tray_audio_delegate_chromeos.cc',
         'system/chromeos/audio/tray_audio_delegate_chromeos.h',
         'system/chromeos/enterprise/enterprise_domain_observer.h',
+        'system/chromeos/bluetooth/bluetooth_notification_controller.cc',
+        'system/chromeos/bluetooth/bluetooth_notification_controller.h',
         'system/chromeos/brightness/brightness_controller_chromeos.cc',
         'system/chromeos/brightness/brightness_controller_chromeos.h',
         'system/chromeos/brightness/tray_brightness.cc',
@@ -1009,6 +1011,7 @@
         ['chromeos==1', {
           'dependencies': [
             '../chromeos/chromeos.gyp:power_manager_proto',
+	    '../device/bluetooth/bluetooth.gyp:device_bluetooth',
           ],
           'sources': [
             'first_run/first_run_helper_unittest.cc',