Architecture for cross-process memory notification suppressing

content/browser/memory/memory_pressure_controller.h

+// Copyright 2015 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_BROWSER_MEMORY_MEMORY_PRESSURE_CONTROLLER_H_
+#define CONTENT_BROWSER_MEMORY_MEMORY_PRESSURE_CONTROLLER_H_
+
+#include <set>
+
+#include "base/callback.h"
+
+namespace content {
+namespace memory {
+
+class MemoryMessageFilter;
+
+using MemoryMessageCallback = base::Callback<void(bool success)>;
+
+class MemoryPressureController {
+ public:
+  MemoryPressureController();
+
+  void OnMemoryMessageFilterAdded(MemoryMessageFilter* filter);
+  void OnMemoryMessageFilterRemoved(MemoryMessageFilter* filter);
+
+  void SetPressureNotificationsSuppressedInAllProcesses(
+      bool suppressed,
+      const MemoryMessageCallback& callback);
+  void OnSetPressureNotificationsSuppressedResponse(
+      MemoryMessageFilter* filter);
+
+  static MemoryPressureController* GetInstance();
+
+ protected:
+  virtual ~MemoryPressureController();
+
+ private:
+  // Set of all memory message filters in the browser process. Always accessed
+  // on the UI thread.
+  typedef std::set<scoped_refptr<MemoryMessageFilter>> MemoryMessageFilterSet;
+  MemoryMessageFilterSet memory_message_filters_;
+
+  // Pending acks for SetPressureNotificationsSuppressedInAllProcesses.
+  MemoryMessageFilterSet pending_set_pressure_notifications_suppressed_filters_;
+  MemoryMessageCallback pending_set_pressure_notifications_suppressed_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(MemoryPressureController);
+};
+
+}  // namespace memory
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_MEMORY_MEMORY_PRESSURE_CONTROLLER_H_