Open HID connections asynchronously.

device/hid/hid_service.h

Index: device/hid/hid_service.h
diff --git a/device/hid/hid_service.h b/device/hid/hid_service.h
index a571434e7c400d4fe5f07a39c670875a74f6ae3a..a3f71320416d26b4c9823b37debb36feb739bb8b 100644
--- a/device/hid/hid_service.h
+++ b/device/hid/hid_service.h
@@ -20,6 +20,9 @@ class HidConnection;
 
 class HidService {
  public:
+  typedef base::Callback<void(scoped_refptr<HidConnection> connection)>
+      ConnectCallback;
+
   static HidService* GetInstance(
       scoped_refptr<base::SingleThreadTaskRunner> file_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
@@ -31,15 +34,10 @@ class HidService {
   // Returns |true| if successful or |false| if |device_id| is invalid.
   bool GetDeviceInfo(const HidDeviceId& device_id, HidDeviceInfo* info) const;
 
-#if defined(OS_CHROMEOS)
-  // Requests access to the given device from the Chrome OS permission broker.
-  virtual void RequestAccess(
-      const HidDeviceId& device_id,
-      const base::Callback<void(bool success)>& callback) = 0;
-#endif
-
-  virtual scoped_refptr<HidConnection> Connect(
-      const HidDeviceId& device_id) = 0;
+  // Opens a connection to a device. The callback will be run with null on
+  // failure.
+  virtual void Connect(const HidDeviceId& device_id,
+                       const ConnectCallback& callback) = 0;
 
  protected:
   friend class HidConnectionTest;