Add webusb notification UI code

components/webusb/webusb_browser_client.h

Index: components/webusb/webusb_browser_client.h
diff --git a/components/webusb/webusb_browser_client.h b/components/webusb/webusb_browser_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..4bd35308cdcff9b09314b0577d7b57915c62726e
--- /dev/null
+++ b/components/webusb/webusb_browser_client.h
@@ -0,0 +1,32 @@
+// 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/macros.h"
+#include "base/strings/string16.h"
+
+class GURL;
+
+namespace webusb {
+
+// Interface to allow the webusb module to make browser-process-specific
+// calls.
+class WebUsbBrowserClient {
+ public:
+  virtual ~WebUsbBrowserClient() {}
+
+  virtual void OnDeviceAdded(const base::string16& product_name,
+                             const GURL& landing_page,
+                             const std::string& notification_id) = 0;
+
+  virtual void OnDeviceRemoved(const std::string& notification_id) = 0;
+};
+
+}  // namespace webusb
+
+#endif  // COMPONENTS_WEBUSB_WEBUSB_BROWSER_CLIENT_H_