bluetooth: Move writeValue to mojo

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

Index: third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom
diff --git a/third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom b/third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom
index b94a0fb29cc5dbf4d17a1f3d90de4b3006d9e172..87690ee39369fd5b3df175cb936a1443b811f70f 100644
--- a/third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom
+++ b/third_party/WebKit/public/platform/modules/bluetooth/web_bluetooth.mojom
@@ -1,6 +1,7 @@
 // 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
@@ -68,3 +69,17 @@ enum WebBluetoothError {
 
 // TODO(ortuno): Define Bluetooth Service.
 // https://crbug.com/508771
+
+// Web Bluetooth Interface that Blink can use to perform
+// Bluetooth GATT Operations on Bluetooth Devices.
+interface WebBluetoothService {
+
+  // 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);
+
+};