Add a public interface for content::MemoryCoordinator

content/public/browser/memory_coordinator.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_PUBLIC_BROWSER_MEMORY_COORDINATOR_H_
+#define CONTENT_PUBLIC_BROWSER_MEMORY_COORDINATOR_H_
+
+#include "base/memory/memory_coordinator_client.h"
+#include "base/process/process_handle.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+// The interface that represents the browser side of MemoryCoordinator.
+// MemoryCoordinator determines memory state of each process (both browser
+// and renderers) and dispatches state change notifications to its clients.
+// See comments on MemoryCoordinatorClient for details.
+class CONTENT_EXPORT MemoryCoordinator {
+ public:
+  virtual ~MemoryCoordinator() {}
+
+  static MemoryCoordinator* GetInstance();
+
+  // Returns the memory state of the given process handle.
+  virtual base::MemoryState GetStateForProcess(base::ProcessHandle handle) = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_MEMORY_COORDINATOR_H_