Add chrome side webusb permission UI code

chrome/browser/ui/cocoa/website_settings/chooser_bubble_ui_cocoa.mm

Index: chrome/browser/ui/cocoa/website_settings/chooser_bubble_ui_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/website_settings/chooser_bubble_ui_cocoa.mm b/chrome/browser/ui/cocoa/website_settings/chooser_bubble_ui_cocoa.mm
new file mode 100644
index 0000000000000000000000000000000000000000..66174b0a1b40d5a8f52d555dd65478ec3364d1c2
--- /dev/null
+++ b/chrome/browser/ui/cocoa/website_settings/chooser_bubble_ui_cocoa.mm
@@ -0,0 +1,17 @@
+// 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.
+
+#include "chrome/browser/ui/cocoa/website_settings/chooser_bubble_ui_cocoa.h"
+
+ChooserBubbleUiCocoa::ChooserBubbleUiCocoa() {}

[Reilly Grant (use Gerrit), 2015/10/29 01:11:32]

This is not ready for review. If you want to wait on the Cocoa implementation
delete these files and just fail the call to navigator.usb.requestDevice on OS X
in ChromeWebUsbPermissionBubble.

[juncai, 2015/10/31 04:15:36]

Done.

+
+ChooserBubbleUiCocoa::~ChooserBubbleUiCocoa() {}
+
+void ChooserBubbleUiCocoa::Show(BubbleReference bubble_reference) {}
+
+void ChooserBubbleUiCocoa::Close() {}
+
+void ChooserBubbleUiCocoa::UpdateAnchorPosition() {}
+
+void ChooserBubbleUiCocoa::Update() {}