Consume Mojo services directly in Blink's WebUSB implementation.

third_party/WebKit/public/platform/modules/webusb/WebUSBClient.h

-// Copyright 2015 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.
-
-#ifndef WebUSBClient_h
-#define WebUSBClient_h
-
-#include "public/platform/WebCallbacks.h"
-#include "public/platform/WebVector.h"
-
-namespace blink {
-
-class WebUSBDevice;
-struct WebUSBDeviceRequestOptions;
-struct WebUSBError;
-
-using WebUSBClientGetDevicesCallbacks = WebCallbacks<std::unique_ptr<WebVector<WebUSBDevice*>>, const WebUSBError&>;
-using WebUSBClientRequestDeviceCallbacks = WebCallbacks<std::unique_ptr<WebUSBDevice>, const WebUSBError&>;
-
-class WebUSBClient {
-public:
-    class Observer {
-    public:
-        virtual ~Observer() { }
-
-        // Called when a device is connected to the system.
-        virtual void onDeviceConnected(std::unique_ptr<WebUSBDevice>) = 0;
-
-        // Called when a device is disconnected from the system.
-        virtual void onDeviceDisconnected(std::unique_ptr<WebUSBDevice>) = 0;
-    };
-
-    virtual ~WebUSBClient() { }
-
-    // Enumerates available devices.
-    // Ownership of the WebUSBClientGetDevicesCallbacks is transferred to the client.
-    virtual void getDevices(WebUSBClientGetDevicesCallbacks*) = 0;
-
-    // Requests access to a device.
-    // Ownership of the WebUSBClientRequestDeviceCallbacks is transferred to the client.
-    virtual void requestDevice(const WebUSBDeviceRequestOptions&, WebUSBClientRequestDeviceCallbacks*) = 0;
-
-    // Adds an observer of device changes to the WebUSBClient.
-    virtual void addObserver(Observer*) = 0;
-
-    // Removes an observer of device changes from the WebUSBClient.
-    virtual void removeObserver(Observer*) = 0;
-};
-
-} // namespace blink
-
-#endif // WebUSBClient_h