Architecture for cross-process memory notification suppressing

content/child/memory/child_memory_message_filter.cc

+// 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.
+
+#include "content/child/memory/child_memory_message_filter.h"
+
+#include "base/memory/memory_pressure_listener.h"
+#include "content/common/memory_messages.h"
+
+namespace content {
+
+ChildMemoryMessageFilter::ChildMemoryMessageFilter() {}
+
+ChildMemoryMessageFilter::~ChildMemoryMessageFilter() {}
+
+bool ChildMemoryMessageFilter::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(ChildMemoryMessageFilter, message)
+    IPC_MESSAGE_HANDLER(MemoryMsg_SetPressureNotificationsSuppressed,
+                        OnSetPressureNotificationsSuppressed)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void ChildMemoryMessageFilter::OnSetPressureNotificationsSuppressed(
+    bool suppressed) {
+  // Enable/disable suppressing memory notifications in the child process.
+  base::MemoryPressureListener::SetNotificationsSuppressed(suppressed);
+}
+
+}  // namespace content