[NotForReview] An idea for experimenting purge & suspend

content/child/memory/child_memory_coordinator_impl.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 CONTENT_CHILD_MEMORY_CHILD_MEMORY_COORDINATOR_IMPL_H_
 #define CONTENT_CHILD_MEMORY_CHILD_MEMORY_COORDINATOR_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/memory_coordinator_client.h"
 #include "content/common/child_memory_coordinator.mojom.h"
@@ skipping 10 matching lines @@
   // Called when the system requests immediate actions to free memory.
   virtual void OnTrimMemoryImmediately() = 0;
 };
 
 // ChildMemoryCoordinatorImpl is the implementation of ChildMemoryCoordinator.
 // It lives in child processes and is responsible for dispatching memory events
 // to its clients.
 class CONTENT_EXPORT ChildMemoryCoordinatorImpl
     : NON_EXPORTED_BASE(public mojom::ChildMemoryCoordinator) {
  public:
+  // Returns true when memory coordinator is enabled.
+  static bool IsEnabled();
+
   // Returns the instance of ChildMemoryCoordinatorImpl. Could be nullptr.
   static ChildMemoryCoordinatorImpl* GetInstance();
 
   ChildMemoryCoordinatorImpl(mojom::MemoryCoordinatorHandlePtr parent,
                              ChildMemoryCoordinatorDelegate* delegate);
   ~ChildMemoryCoordinatorImpl() override;
 
   // mojom::ChildMemoryCoordinator implementations:
   void OnStateChange(mojom::MemoryState state) override;
 
@@ skipping 12 matching lines @@
 
 // Factory function for creating a ChildMemoryCoordinator for the current
 // platform. Doesn't take the ownership of |delegate|.
 CONTENT_EXPORT std::unique_ptr<ChildMemoryCoordinatorImpl>
 CreateChildMemoryCoordinator(mojom::MemoryCoordinatorHandlePtr parent,
                              ChildMemoryCoordinatorDelegate* delegate);
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_MEMORY_CHILD_MEMORY_COORDINATOR_IMPL_H_