bluetooth: Move read value to mojo

third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module blink.mojom;
 
 // Errors that can occur during Web Bluetooth execution, which are transformed
 // to a DOMException in Source/modules/bluetooth/BluetoothError.cpp.
 //
 // These errors all produce constant message strings. If a particular message
@@ skipping 61 matching lines @@
 // https://crbug.com/508771
 
 // Web Bluetooth Interface that Blink can use to perform
 // Bluetooth GATT Operations on Bluetooth Devices.
 interface WebBluetoothService {
   // Sets the client for this WebBluetoothService. The service will notify the
   // client of device events e.g. when a Characteristic's value changes or when
   // a device disconnects.
   SetClient(associated WebBluetoothServiceClient client);
 
+  // Reads the value for characteristic with
+  // |characteristic_instance_id|. If the value is successfully read the
+  // callback will be run with WebBluetoothError::SUCCESS and the
+  // characteristic's value. If the value is not successfully read the
+  // callback with be run with the corresponding error and nullptr for value.
+  RemoteCharacteristicReadValue(
+    string characteristic_instance_id) => (
+    WebBluetoothError error,
+    array<uint8>? value);
+
   // Writes a value to the characteristic with
   // |characteristic_instance_id|. The callback is run with
   // WebBluetoothError::SUCCESS if the value was successfully
   // written.
   RemoteCharacteristicWriteValue(
     string characteristic_instance_id,
     array<uint8> value) => (WebBluetoothError error);
 
   // Starts notifications for the characteristic with
   // |characteristic_instance_id|.
   RemoteCharacteristicStartNotifications(
     string characteristic_instance_id) => (WebBluetoothError error);
 
   // Stops notifications for the characteristic with
   // |characteristic_instance_id|.
   RemoteCharacteristicStopNotifications(
     string characteristic_instance_id) => ();
 };
 
 // Classes should implement this interface and pass an associated pointer
 // bound to them to the WebBluetoothService by using SetClient. Classes
 // that do this will be notified of device events e.g. device disconnection.
 interface WebBluetoothServiceClient {
   RemoteCharacteristicValueChanged(string characteristic_instance_id,
                                    array<uint8> value);
 };