Implement WebBluetooth descriptor.readValue()

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;
 
 import "device/bluetooth/public/interfaces/uuid.mojom";
 
 // Result codes that can occur during Web Bluetooth execution, which are
 // transformed to a DOMException in Source/modules/bluetooth/BluetoothError.cpp.
@@ skipping 54 matching lines @@
   GATT_NOT_AUTHORIZED,
   BLOCKLISTED_DESCRIPTOR_UUID,
   BLOCKLISTED_CHARACTERISTIC_UUID,
   BLOCKLISTED_READ,
   BLOCKLISTED_WRITE,
   NOT_ALLOWED_TO_ACCESS_ANY_SERVICE,
   NOT_ALLOWED_TO_ACCESS_SERVICE,
   REQUEST_DEVICE_WITH_BLOCKLISTED_UUID,
   REQUEST_DEVICE_FROM_CROSS_ORIGIN_IFRAME,
   REQUEST_DEVICE_WITHOUT_FRAME,
+  DESCRIPTOR_NO_LONGER_EXISTS,
 };
 
 struct WebBluetoothScanFilter {
   array<bluetooth.mojom.UUID>? services;
   string? name;
   string? name_prefix;
 };
 
 struct WebBluetoothRequestDeviceOptions {
   array<WebBluetoothScanFilter>? filters;
@@ skipping 106 matching lines @@
   // Returns the Descriptors of a GATT Characteristic with
   // |characteristics_instance_id|.
   // If |quantity| == WebBluetoothGATTQueryQuantity::SINGLE, only one descriptor
   // will be returned.
   RemoteCharacteristicGetDescriptors(
     string characteristics_instance_id,
     WebBluetoothGATTQueryQuantity quantity,
     bluetooth.mojom.UUID? descriptor_uuid) => (
       WebBluetoothResult result,
       array<WebBluetoothRemoteGATTDescriptor>? descriptors);
+
+  // Reads the value for descriptor with |descriptor_instance_id|.

[scheib, 2017/01/19 06:16:18]

See comment style template change in tip of tree, made in this patch:
https://codereview.chromium.org/2635473004

[dougt, 2017/01/20 03:17:24]

Done.

+  // If the value is successfully read the callback will be run with
+  // WebBluetoothResult::SUCCESS and the descriptor's value. If the value is not
+  // successfully read the callback with be run with the corresponding error and
+  // nullptr for value.
+  RemoteDescriptorReadValue(
+    string descriptor_instance_id) => (
+    WebBluetoothResult result,
+    array<uint8>? value);
 };
 
 // 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);
   GattServerDisconnected(WebBluetoothDeviceId device_id);
 };