Initial UKMPageLoadMetricsObserver

components/ukm/ukm_service.h

Index: components/ukm/ukm_service.h
diff --git a/components/ukm/ukm_service.h b/components/ukm/ukm_service.h
index 0c5172e83c5070786b8f07afad9f4ad15e72c7f7..a32bc7de17b2cebedbc9c8c295718f2df7334855 100644
--- a/components/ukm/ukm_service.h
+++ b/components/ukm/ukm_service.h
@@ -25,6 +25,8 @@ class MetricsServiceClient;
 
 namespace ukm {
 
+class UkmSource;
+
 // This feature controls whether UkmService should be created.
 extern const base::Feature kUkmFeature;
 
@@ -47,6 +49,8 @@ class UkmService : public base::SupportsWeakPtr<UkmService> {
   void EnableReporting();
   void DisableReporting();
 
+  void RecordSource(std::unique_ptr<UkmSource> source);
+
   // Record any collected data into logs, and write to disk.
   void Flush();
 
@@ -57,6 +61,11 @@ class UkmService : public base::SupportsWeakPtr<UkmService> {
   // the provided PrefRegistry.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
+ protected:
+  const std::vector<std::unique_ptr<UkmSource>>& sources_for_testing() const {
+    return sources_;
+  }
+
  private:
   // Start metrics client initialization.
   void StartInitTask();
@@ -103,6 +112,8 @@ class UkmService : public base::SupportsWeakPtr<UkmService> {
   bool initialize_complete_;
   bool log_upload_in_progress_;
 
+  std::vector<std::unique_ptr<UkmSource>> sources_;
+
   // Weak pointers factory used to post task on different threads. All weak
   // pointers managed by this factory have the same lifetime as UkmService.
   base::WeakPtrFactory<UkmService> self_ptr_factory_;