Add chrome://usb-internals page for adding and removing test devices.

chrome/browser/ui/webui/usb_internals/usb_internals_ui.h

+// 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.
+
+#ifndef CHROME_BROWSER_UI_WEBUI_USB_INTERNALS_USB_INTERNALS_UI_H_
+#define CHROME_BROWSER_UI_WEBUI_USB_INTERNALS_USB_INTERNALS_UI_H_
+
+#include "base/macros.h"
+#include "chrome/browser/ui/webui/mojo_web_ui_controller.h"
+#include "chrome/browser/ui/webui/usb_internals/usb_internals.mojom.h"
+
+class UsbInternalsPageHandler;
+
+// The WebUI for chrome://usb-internals.
+class UsbInternalsUI
+    : public MojoWebUIController<mojom::UsbInternalsPageHandler> {
+ public:
+  explicit UsbInternalsUI(content::WebUI* web_ui);
+  ~UsbInternalsUI() override;
+
+ private:
+  // MojoWebUIController overrides:
+  void BindUIHandler(mojom::UsbInternalsPageHandlerRequest request) override;
+
+  std::unique_ptr<UsbInternalsPageHandler> page_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(UsbInternalsUI);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_USB_INTERNALS_USB_INTERNALS_UI_H_