MemoryPressure: sends the signal to the renderer.

content/child/memory_pressure_message_filter.cc

Index: content/child/memory_pressure_message_filter.cc
diff --git a/content/child/memory_pressure_message_filter.cc b/content/child/memory_pressure_message_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..605dd6238f9c033a784bc62ddbcfc517a2012fb7
--- /dev/null
+++ b/content/child/memory_pressure_message_filter.cc
@@ -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.
+
+#include "content/child/memory_pressure_message_filter.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "content/common/memory_pressure_messages.h"
+
+namespace content {
+
+MemoryPressureMessageFilter::MemoryPressureMessageFilter() {
+}
+
+bool MemoryPressureMessageFilter::OnMessageReceived(const IPC::Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(MemoryPressureMessageFilter, msg)
+    IPC_MESSAGE_HANDLER(MemoryPressureMsg_MemoryPressure,
+                        OnMemoryPressure)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+MemoryPressureMessageFilter::~MemoryPressureMessageFilter() {
+}
+
+void MemoryPressureMessageFilter::OnMemoryPressure(
+    base::MemoryPressureListener::MemoryPressureLevel level) {
+  base::MemoryPressureListener::NotifyMemoryPressure(level);
+}
+
+}  // namespace content