MemoryPressure: sends the signal to the renderer.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 7727b885834c82fd426325adec4d8c779f266f56..4fe2e0f9cb3cb12eb9c4a6e3fb0a7347dc0348d7 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -29,6 +29,7 @@
 #include "content/child/child_histogram_message_filter.h"
 #include "content/child/indexed_db/indexed_db_dispatcher.h"
 #include "content/child/indexed_db/indexed_db_message_filter.h"
+#include "content/child/memory_pressure_message_filter.h"
 #include "content/child/npobject_util.h"
 #include "content/child/plugin_messages.h"
 #include "content/child/resource_dispatcher.h"
@@ -367,6 +368,7 @@ void RenderThreadImpl::Init() {
   AddFilter(audio_message_filter_.get());
 
   AddFilter(new IndexedDBMessageFilter);
+  AddFilter(new MemoryPressureMessageFilter);
 
   GetContentClient()->renderer()->RenderThreadStarted();