Add chrome side webusb permission UI code

chrome/browser/usb/web_usb_permission_bubble_request.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_request.h"
+
+#include "base/strings/utf_string_conversions.h"
+#include "device/devices_app/usb/type_converters.h"
+#include "device/usb/usb_device.h"
+
+WebUsbPermissionBubbleRequest::WebUsbPermissionBubbleRequest(
+    const std::vector<scoped_refptr<device::UsbDevice>>& devices,
+    const webusb::WebUsbPermissionBubble::GetPermissionCallback& callback)
+    : devices_(devices), callback_(callback) {
+  num_devices_ = static_cast<int>(devices_.size());
+  for (const auto& device : devices) {
+    device_names_.push_back(base::UTF16ToASCII(device->product_string()));
+  }
+}
+
+WebUsbPermissionBubbleRequest::~WebUsbPermissionBubbleRequest() {
+  if (!callback_.is_null()) {
+    callback_.Run(nullptr);
+  }
+}
+
+void WebUsbPermissionBubbleRequest::Connect(int index) {
+  if (index >= 0 && index < num_devices_) {
+    device::usb::DeviceInfoPtr device_info_ptr =
+        device::usb::DeviceInfo::From(*devices_[index]);
+    callback_.Run(device_info_ptr.Pass());
+  } else {
+    callback_.Run(nullptr);
+  }
+  callback_.reset();  // reset callback so that it is only called once.
+}
+
+void WebUsbPermissionBubbleRequest::Cancel() {
+  callback_.Run(nullptr);
+  callback_.reset();  // reset callback so that it is only called once.
+}
+
+const std::vector<std::string>& WebUsbPermissionBubbleRequest::device_names()
+    const {
+  return device_names_;
+}