Add webusb notification UI code

components/webusb/webusb_browser_client.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 COMPONENTS_WEBUSB_WEBUSB_BROWSER_CLIENT_H_
+#define COMPONENTS_WEBUSB_WEBUSB_BROWSER_CLIENT_H_
+
+#include <string>
+
+#include "base/memory/weak_ptr.h"
+#include "base/scoped_observer.h"
+#include "components/keyed_service/core/keyed_service.h"
+#include "device/usb/usb_service.h"
+
+class GURL;
+class Profile;
+
+namespace webusb {
+
+// Interface to allow the webusb module to make browser-process-specific
+// calls. Should be Set() once in the browser process.
+
+class WebUsbBrowserClient {
+ public:
+  virtual ~WebUsbBrowserClient() {}
+
+  virtual void OnDeviceAdded(Profile* profile,
+                             const char* product_name,
+                             const GURL& landing_page,
+                             const std::string& notification_id) = 0;
+
+  virtual void OnDeviceRemoved(const std::string& notification_id) = 0;
+
+  virtual void OpenURL(Profile* profile, const GURL& url) = 0;
+
+  virtual bool WebUsbNotificationEnabled() = 0;
+
+  // Returns the single instance of |this|.
+  static WebUsbBrowserClient* Get();
+
+  // Initialize the single instance.
+  static void Set(WebUsbBrowserClient* client);
+};
+
+}  // namespace webusb
+
+#endif  // COMPONENTS_WEBUSB_WEBUSB_BROWSER_CLIENT_H_