Expose device RSSI and Tx power via the chrome.bluetooth API.

chrome/browser/extensions/api/bluetooth/bluetooth_private_api.cc

Index: chrome/browser/extensions/api/bluetooth/bluetooth_private_api.cc
diff --git a/chrome/browser/extensions/api/bluetooth/bluetooth_private_api.cc b/chrome/browser/extensions/api/bluetooth/bluetooth_private_api.cc
index 1ac35ebe0e965ab3ba046f0bc40633826da63ee0..a212b146321e4a7a6c302c80c690e6a1fd49c293 100644
--- a/chrome/browser/extensions/api/bluetooth/bluetooth_private_api.cc
+++ b/chrome/browser/extensions/api/bluetooth/bluetooth_private_api.cc
@@ -276,6 +276,30 @@ bool BluetoothPrivateSetPairingResponseFunction::DoWork(
   return true;
 }
 
+BluetoothPrivateGetDeviceRSSIFunction::
+    BluetoothPrivateGetDeviceRSSIFunction() {}
+
+BluetoothPrivateGetDeviceRSSIFunction::
+    ~BluetoothPrivateGetDeviceRSSIFunction() {}
+
+bool BluetoothPrivateGetDeviceRSSIFunction::DoWork(
+    scoped_refptr<device::BluetoothAdapter> adapter) {
+  scoped_ptr<bt_private::GetDeviceRSSI::Params> params(
+      bt_private::GetDeviceRSSI::Params::Create(*args_));
+  EXTENSION_FUNCTION_VALIDATE(params.get());
+  const std::string& device_address = params->address;
+  device::BluetoothDevice* device = adapter->GetDevice(device_address);
+  if (!device) {
+    SetError(kDeviceNotFoundError);
+    SendResponse(false);
+    return false;
+  }
+
+  results_ = bt_private::GetDeviceRSSI::Results::Create(device->GetRSSI());
+  SendResponse(true);
+  return true;
+}
+
 }  // namespace api
 
 }  // namespace extensions