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

components/memory_coordinator/common/client_registry.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_MEMORY_COORDINATOR_COMMON_CLIENT_REGISTRY_H_
 #define COMPONENTS_MEMORY_COORDINATOR_COMMON_CLIENT_REGISTRY_H_
 
 #include "base/observer_list_threadsafe.h"
 #include "components/memory_coordinator/common/memory_coordinator_client.h"
 #include "components/memory_coordinator/common/memory_coordinator_export.h"
 
 namespace memory_coordinator {
 
 // ClientRegistry is a base class of process-specific memory coordinator
 // and provides ways to register/unregister MemoryCoordinatorClients.
 class MEMORY_COORDINATOR_EXPORT ClientRegistry {
  public:
   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
 
 #endif  // COMPONENTS_MEMORY_COORDINATOR_COMMON_CLIENT_REGISTRY_H_