Pass Physical Web metadata through a struct

components/physical_web/data_source/fake_physical_web_data_source.h

Index: components/physical_web/data_source/fake_physical_web_data_source.h
diff --git a/components/physical_web/data_source/fake_physical_web_data_source.h b/components/physical_web/data_source/fake_physical_web_data_source.h
index 61ef79839e881182f56c237417b257ae6cda5f0f..1f25843a446a8f3d20f1f3bd1f1214355d99b4a2 100644
--- a/components/physical_web/data_source/fake_physical_web_data_source.h
+++ b/components/physical_web/data_source/fake_physical_web_data_source.h
@@ -41,6 +41,7 @@ class FakePhysicalWebDataSource : public PhysicalWebDataSource {
   void StopDiscovery() override;
 
   std::unique_ptr<base::ListValue> GetMetadata() override;
+  std::unique_ptr<MetadataList> GetMetadataList() override;
 
   bool HasUnresolvedDiscoveries() override;
 
@@ -49,6 +50,7 @@ class FakePhysicalWebDataSource : public PhysicalWebDataSource {
 
   // for testing
   void SetMetadata(std::unique_ptr<base::ListValue> metadata);
+  void SetMetadataList(std::unique_ptr<MetadataList> metadata_list);
   void NotifyOnFound(const std::string& url);
   void NotifyOnLost(const std::string& url);
   void NotifyOnDistanceChanged(const std::string& url,
@@ -56,6 +58,7 @@ class FakePhysicalWebDataSource : public PhysicalWebDataSource {
 
  private:
   std::unique_ptr<base::ListValue> metadata_;
+  std::unique_ptr<MetadataList> metadata_list_;
   base::ObserverList<PhysicalWebListener> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(FakePhysicalWebDataSource);