Architecture for cross-process memory notification suppressing

content/common/memory_messages.h

Index: content/common/memory_messages.h
diff --git a/content/common/memory_messages.h b/content/common/memory_messages.h
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+++ b/content/common/memory_messages.h
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+// 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.
+
+// Multiply-included message header, no traditional include guard.
+
+#include "ipc/ipc_message_macros.h"
+
+#define IPC_MESSAGE_START MemoryMsgStart
+
+// Sent to all child processes to enable/disable suppressing memory
+// notifications.
+IPC_MESSAGE_CONTROL1(MemoryMsg_SetPressureNotificationsSuppressed,
+                     bool /* suppressed */)
+
+// Sent to the browser to ack enabling/disabling suppressing memory
+// notifications.
+IPC_MESSAGE_CONTROL0(MemoryHostMsg_SetPressureNotificationsSuppressedAck)