[GRC] Coordination Unit Graph Observer

services/resource_coordinator/coordination_unit/coordination_unit_manager.h

Index: services/resource_coordinator/coordination_unit/coordination_unit_manager.h
diff --git a/services/resource_coordinator/coordination_unit/coordination_unit_manager.h b/services/resource_coordinator/coordination_unit/coordination_unit_manager.h
index 4b10fcd096f88ea691f16d897f47ca63694a5fce..d5588704e075e40f40b27611bffe2c8dd5118e78 100644
--- a/services/resource_coordinator/coordination_unit/coordination_unit_manager.h
+++ b/services/resource_coordinator/coordination_unit/coordination_unit_manager.h
@@ -5,6 +5,9 @@
 #ifndef SERVICES_RESOURCE_COORDINATOR_COORDINATION_UNIT_COORDINATION_UNIT_MANAGER_H_
 #define SERVICES_RESOURCE_COORDINATOR_COORDINATION_UNIT_COORDINATION_UNIT_MANAGER_H_
 
+#include <memory>
+#include <vector>
+
 #include "base/macros.h"
 #include "services/service_manager/public/cpp/binder_registry.h"
 
@@ -14,8 +17,11 @@ class ServiceContextRefFactory;
 
 namespace resource_coordinator {
 
+class CoordinationUnitImpl;
+class CoordinationUnitGraphObserver;
+
 // The CoordinationUnitManager is a singleton that encapsulates all
-// aspects of Coordination Units within the ResourceCoordinatorService.
+// aspects of Coordination Units within the resource_coordinator service.
 // All functionality for dealing with CoordinationUnits should be contained
 // within this class or classes that are owned by it
 class CoordinationUnitManager {
@@ -25,8 +31,20 @@ class CoordinationUnitManager {
 
   void OnStart(service_manager::BinderRegistry* registry,
                service_manager::ServiceContextRefFactory* service_ref_factory);
+  void RegisterObserver(
+      std::unique_ptr<CoordinationUnitGraphObserver> observer);
+  void OnCoordinationUnitCreated(CoordinationUnitImpl* coordination_unit);
+  void OnCoordinationUnitWillBeDestroyed(
+      CoordinationUnitImpl* coordination_unit);
+
+  std::vector<std::unique_ptr<CoordinationUnitGraphObserver>>&
+  observers_for_testing() {
+    return observers_;
+  }
 
  private:
+  std::vector<std::unique_ptr<CoordinationUnitGraphObserver>> observers_;
+
   static void Create(
       service_manager::ServiceContextRefFactory* service_ref_factory);