Show "Paired" for already paired WebUSB devices on the chooser

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 7b2c6d3ae2f20269cc9c09e6fc799cd35b9a1af4..59a6e166101c406ba5f0bef1552a6ccaee6134a3 100644
--- a/chrome/browser/usb/usb_chooser_controller.cc
+++ b/chrome/browser/usb/usb_chooser_controller.cc
@@ -17,6 +17,7 @@
 #include "chrome/browser/usb/usb_chooser_context.h"
 #include "chrome/browser/usb/usb_chooser_context_factory.h"
 #include "chrome/browser/usb/web_usb_histograms.h"
+#include "chrome/browser/usb/web_usb_permission_provider.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/generated_resources.h"
@@ -97,6 +98,11 @@ base::string16 UsbChooserController::GetOption(size_t index) const {
                    devices_[index].first->serial_number());
 }
 
+bool UsbChooserController::IsPaired(size_t index) const {
+  return WebUSBPermissionProvider::HasDevicePermission(render_frame_host_,
+                                                       devices_[index].first);
+}
+
 void UsbChooserController::RefreshOptions() {}
 
 base::string16 UsbChooserController::GetStatus() const {