Add signal strength indicator icon to WebBluetooth chooser on non-Mac desktops

chrome/browser/usb/usb_chooser_controller.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/usb_chooser_controller.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 55 matching lines @@
 
   usb_service->GetDevices(base::Bind(&UsbChooserController::GotUsbDeviceList,
                                      weak_factory_.GetWeakPtr()));
 }
 
 UsbChooserController::~UsbChooserController() {
   if (!callback_.is_null())
     callback_.Run(nullptr);
 }
 
+bool UsbChooserController::HasIconBeforeText() const {
+  return false;
+}
+
 base::string16 UsbChooserController::GetNoOptionsText() const {
   return l10n_util::GetStringUTF16(IDS_DEVICE_CHOOSER_NO_DEVICES_FOUND_PROMPT);
 }
 
 base::string16 UsbChooserController::GetOkButtonLabel() const {
   return l10n_util::GetStringUTF16(IDS_USB_DEVICE_CHOOSER_CONNECT_BUTTON_TEXT);
 }
 
 size_t UsbChooserController::NumOptions() const {
   return devices_.size();
 }
 
+int UsbChooserController::GetSignalStrengthLevel(size_t index) const {
+  return -1;
+}
+
 base::string16 UsbChooserController::GetOption(size_t index) const {
   DCHECK_LT(index, devices_.size());
   const base::string16& device_name = devices_[index].second;
   const auto& it = device_name_map_.find(device_name);
   DCHECK(it != device_name_map_.end());
   return it->second == 1
              ? device_name
              : l10n_util::GetStringFUTF16(
                    IDS_DEVICE_CHOOSER_DEVICE_NAME_WITH_ID, device_name,
                    devices_[index].first->serial_number());
@@ skipping 89 matching lines @@
 
 bool UsbChooserController::DisplayDevice(
     scoped_refptr<device::UsbDevice> device) const {
   return device::UsbDeviceFilter::MatchesAny(device, filters_) &&
          (base::CommandLine::ForCurrentProcess()->HasSwitch(
               switches::kDisableWebUsbSecurity) ||
           device::FindInWebUsbAllowedOrigins(
               device->webusb_allowed_origins(),
               render_frame_host_->GetLastCommittedURL().GetOrigin()));
 }