Expose Physical Web data

ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h

Index: ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h
diff --git a/ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h b/ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h
index 2960830ff4d23abdcab5d61f1480293c439271fb..1c0c1d425cb978f62e5caef869725b43696959dd 100644
--- a/ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h
+++ b/ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h
@@ -12,6 +12,7 @@
 namespace base {
 class ListValue;
 }
+class PhysicalWebListener;
 
 @class PhysicalWebScanner;
 
@@ -36,6 +37,12 @@ class IOSChromePhysicalWebDataSource : public PhysicalWebDataSource {
   // or more discovered URLs that have not been sent to the resolution service.
   bool HasUnresolvedDiscoveries() override;
 
+  // Register for changes to Physical Web URLs and associated page metadata.
+  void RegisterListener(PhysicalWebListener* physical_web_listener) override;
+
+  // Unregister for changes to Physical Web URLs and associated page metadata.
+  void UnregisterListener(PhysicalWebListener* physical_web_listener) override;
+
  private:
   // Scanner for nearby Physical Web URL devices.
   base::scoped_nsobject<PhysicalWebScanner> scanner_;