bluetooth: Browser-side implementation of getCharacteristic

content/common/bluetooth/bluetooth_messages.h

 // Copyright 2014 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.
 
 // Messages for Web Bluetooth API.
 // Multiply-included message file, hence no include guard.
 
 // Web Bluetooth Security
 // The security mechanisms of Bluetooth are described in the specification:
 // https://webbluetoothcg.github.io/web-bluetooth
@@ skipping 123 matching lines @@
                      int /* thread_id */,
                      int /* request_id */,
                      std::string /* service_instance_id */)
 
 // Informs the renderer that the primary service request |request_id| failed.
 IPC_MESSAGE_CONTROL3(BluetoothMsg_GetPrimaryServiceError,
                      int /* thread_id */,
                      int /* request_id */,
                      content::BluetoothError /* result */)
 
+// Informs the renderer that characteristic request |request_id| succeeded.
+IPC_MESSAGE_CONTROL3(BluetoothMsg_GetCharacteristicSuccess,
+                     int /* thread_id */,
+                     int /* request_id */,
+                     std::string /* characteristic_instance_id */)
+
+// Informs the renderer that the characteristic request |request_id| failed.
+IPC_MESSAGE_CONTROL3(BluetoothMsg_GetCharacteristicError,
+                     int /* thread_id */,
+                     int /* request_id */,
+                     content::BluetoothError /* result */)
+
 // Messages sent from the renderer to the browser.
 
 // Requests a bluetooth device from the browser.
 // TODO(scheib): UI to select and permit access to a device crbug.com/436280.
 //   This will include refactoring messages to be associated with an origin
 //   and making this initial requestDevice call with an associated frame.
 //   This work is deferred to simplify initial prototype patches.
 //   The Bluetooth feature, and the BluetoothDispatcherHost are behind
 //   the --enable-experimental-web-platform-features flag.
 IPC_MESSAGE_CONTROL2(BluetoothHostMsg_RequestDevice,
                      int /* thread_id */,
                      int /* request_id */)
 
 // Connects to a bluetooth device.
 IPC_MESSAGE_CONTROL3(BluetoothHostMsg_ConnectGATT,
                      int /* thread_id */,
                      int /* request_id */,
                      std::string /* device_instance_id */)
 
 // Gets primary service from bluetooth device.
 IPC_MESSAGE_CONTROL4(BluetoothHostMsg_GetPrimaryService,
                      int /* thread_id */,
                      int /* request_id */,
                      std::string /* device_instance_id */,
                      std::string /* service_uuid */)
+
+// Gets a GATT Characteristic within a GATT Service.
+IPC_MESSAGE_CONTROL4(BluetoothHostMsg_GetCharacteristic,
+                     int /* thread_id */,
+                     int /* request_id */,
+                     std::string /* service_instance_id */,
+                     std::string /* characteristic_uuid */)