Add chrome side webusb permission UI code

chrome/browser/usb/web_usb_permission_bubble.cc

+// 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/usb/web_usb_permission_bubble.h"
+
+#include "chrome/browser/ui/browser_finder.h"
+#include "chrome/browser/ui/chrome_bubble_manager.h"
+#include "chrome/browser/usb/usb_chooser_bubble_delegate.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/render_frame_host.h"
+
+ChromeWebUsbPermissionBubble::ChromeWebUsbPermissionBubble(
+    content::RenderFrameHost* render_frame_host,
+    mojo::InterfaceRequest<WebUsbPermissionBubble> request)
+    : render_frame_host_(render_frame_host), binding_(this, request.Pass()) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  DCHECK(render_frame_host);
+}
+
+ChromeWebUsbPermissionBubble::~ChromeWebUsbPermissionBubble() {}
+
+void ChromeWebUsbPermissionBubble::GetPermission(
+    mojo::Array<device::usb::DeviceFilterPtr> device_filters,
+    const GetPermissionCallback& callback) {
+  content::WebContents* web_contents =
+      content::WebContents::FromRenderFrameHost(render_frame_host_);
+  Browser* browser = chrome::FindBrowserWithWebContents(web_contents);
+  scoped_ptr<BubbleDelegate> bubble_delegate(new UsbChooserBubbleDelegate(
+      browser, device_filters.Pass(), render_frame_host_, callback));
+  browser->GetBubbleManager()->ShowBubble(bubble_delegate.Pass());

[Reilly Grant (use Gerrit), 2015/10/29 01:11:33]

I think we need to keep track of open bubbles in case render_frame_host_ is
destroyed, which is why this class is owned by the UsbTabHelper.

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

Done.

+}