Make cc::SoftwareImageDecodeController, cc::ResourcePool, and cc::StagingBufferPoo…

components/memory_coordinator/common/client_registry.h

Index: components/memory_coordinator/common/client_registry.h
diff --git a/components/memory_coordinator/common/client_registry.h b/components/memory_coordinator/common/client_registry.h
index ec5874f15c69f261017c7ec7b6be84da67581f99..dcc0d2377dc6905a21f954d7b45affb6c93a8c73 100644
--- a/components/memory_coordinator/common/client_registry.h
+++ b/components/memory_coordinator/common/client_registry.h
@@ -18,16 +18,21 @@ class MEMORY_COORDINATOR_EXPORT ClientRegistry {
   ClientRegistry();
   virtual ~ClientRegistry();
 
+  static ClientRegistry* GetInstance();
+
   // Registers/unregisters a client. Does not take ownership of client.
   void RegisterClient(MemoryCoordinatorClient* client);
   void UnregisterClient(MemoryCoordinatorClient* client);
 
  protected:
+  static void SetInstance(ClientRegistry*);
+
   using ClientList = base::ObserverListThreadSafe<MemoryCoordinatorClient>;
   ClientList* clients() { return clients_.get(); }
 
  private:
   scoped_refptr<ClientList> clients_;
+  static ClientRegistry* instance_;
 };
 
 }  // namespace memory_coordinator