Add chrome side webusb permission UI code

chrome/browser/ui/website_settings/chooser_bubble_delegate.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 CHROME_BROWSER_UI_WEBSITE_SETTINGS_CHOOSER_BUBBLE_DELEGATE_H_
+#define CHROME_BROWSER_UI_WEBSITE_SETTINGS_CHOOSER_BUBBLE_DELEGATE_H_
+
+#include "base/macros.h"
+#include "components/bubble/bubble_delegate.h"
+
+class ChooserOptions;
+
+class ChooserBubbleDelegate : public BubbleDelegate {
+ public:
+  ChooserBubbleDelegate();
+  ~ChooserBubbleDelegate() override;
+
+  // BubbleDelegate:
+  std::string GetName() const override;
+
+  virtual void Select(int index) = 0;
+  virtual void Cancel() = 0;
+  virtual void Close() = 0;
+
+ protected:
+  scoped_ptr<ChooserOptions> chooser_options_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ChooserBubbleDelegate);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBSITE_SETTINGS_CHOOSER_BUBBLE_DELEGATE_H_