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

chrome/browser/usb/usb_chooser_controller.cc

Index: chrome/browser/usb/usb_chooser_controller.cc
diff --git a/chrome/browser/usb/usb_chooser_controller.cc b/chrome/browser/usb/usb_chooser_controller.cc
index 8833d7221413dafc88f185d3f5dc291762a1f0ef..8584ea0acc3a89b1475bbf666e9ba660ca73953d 100644
--- a/chrome/browser/usb/usb_chooser_controller.cc
+++ b/chrome/browser/usb/usb_chooser_controller.cc
@@ -73,6 +73,10 @@ UsbChooserController::~UsbChooserController() {
     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);
 }
@@ -85,6 +89,10 @@ 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;