Hook up RSSI and host transmit power Bluetooth device properties for ChromeOS.

device/bluetooth/bluetooth_device.h

Index: device/bluetooth/bluetooth_device.h
diff --git a/device/bluetooth/bluetooth_device.h b/device/bluetooth/bluetooth_device.h
index 7dce44f5bcdda1736bfd43db92ed24a209f3f956..d90f4ae96015bce72f938d229cd045fe30ad99ee 100644
--- a/device/bluetooth/bluetooth_device.h
+++ b/device/bluetooth/bluetooth_device.h
@@ -404,6 +404,17 @@ class BluetoothDevice {
       const base::Closure& callback,
       const ErrorCallback& error_callback) = 0;
 
+  // Starts monitoring the connection properties, RSSI and TX power. These
+  // properties will be tracked, and updated when their values change. Exactly
+  // one of |callback| or |error_callback| will be run.
+  virtual void StartConnectionMonitor(const base::Closure& callback,
+                                      const ErrorCallback& error_callback) = 0;
+
+  // Stops monitoring the connection properties. Exactly one of |callback| or
+  // |error_callback| will be run.
+  virtual void StopConnectionMonitor(const base::Closure& callback,
+                                     const ErrorCallback& error_callback) = 0;
+

[keybuk, 2014/05/09 22:37:21]

NAK... we've been burned by these Start/Stop APIs before

Model your API on the Discovery Session API - have StartConnectionMonitor return
a scoped or ref-counted object that has a method on it to stop it again

[Tim Song, 2014/05/09 23:10:43]

Can I just have StartConnectionMonitor for now (no StopConnectionMonitor) and
make a session based approach with the actual API?

   // Returns the list of discovered GATT services.
   virtual std::vector<BluetoothGattService*> GetGattServices() const;