BT adapter is switched to initial state after HID screen if no BT devices connected.

chrome/browser/ui/webui/chromeos/login/hid_detection_screen_handler.h

Index: chrome/browser/ui/webui/chromeos/login/hid_detection_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/hid_detection_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/hid_detection_screen_handler.h
index 7c3e28973e5dce7023f9d8a1c5f9e535d07b2032..c072a431f28428c1b64f9951298a5ad2c321ab0e 100644
--- a/chrome/browser/ui/webui/chromeos/login/hid_detection_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/hid_detection_screen_handler.h
@@ -168,6 +168,10 @@ class HIDDetectionScreenHandler
   // power BT adapter.
   void SetPoweredError();
 
+  // Called by device::BluetoothAdapter in response to a failure to
+  // power off BT adapter.
+  void SetPoweredOffError();
+
   // Called for revision of active devices. If current-placement is available
   // for mouse or keyboard device, sets one of active devices as current or
   // tries to connect some BT device if no appropriate devices are connected.
@@ -210,6 +214,9 @@ class HIDDetectionScreenHandler
 
   bool switch_on_adapter_when_ready_;
 
+  // State of BT adapter before screen-initiated changes.
+  scoped_ptr<bool> adapter_initially_powered_;
+
   base::WeakPtrFactory<HIDDetectionScreenHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HIDDetectionScreenHandler);