MemoryPressure: sends the signal to the renderer.

content/child/memory_pressure_message_filter.h

Index: content/child/memory_pressure_message_filter.h
diff --git a/content/child/memory_pressure_message_filter.h b/content/child/memory_pressure_message_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..e44947ad9a895977be6a35d702947eeb9be01250
--- /dev/null
+++ b/content/child/memory_pressure_message_filter.h
@@ -0,0 +1,34 @@
+// Copyright 2013 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_PRESSURE_MESSAGE_FILTER_H_
+#define CONTENT_CHILD_MEMORY_PRESSURE_MESSAGE_FILTER_H_
+
+#include "base/memory/memory_pressure_listener.h"
+#include "ipc/ipc_channel_proxy.h"
+
+struct MemoryPressureMsg;
+
+namespace content {
+
+class MemoryPressureMessageFilter : public IPC::ChannelProxy::MessageFilter {
+ public:
+  MemoryPressureMessageFilter();
+
+  // IPC::Listener implementation.
+  virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
+
+ protected:
+  virtual ~MemoryPressureMessageFilter();
+
+ private:
+  void OnMemoryPressure(
+      base::MemoryPressureListener::MemoryPressureLevel level);
+
+  DISALLOW_COPY_AND_ASSIGN(MemoryPressureMessageFilter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_CHILD_MEMORY_PRESSURE_MESSAGE_FILTER_H_