MemoryPressure: sends the signal to the renderer.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index dae48644401620fd85acc828cfd81647504de6f8..567e0e56bcc8a71b9207bbfecc46686ec1049c26 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -39,6 +39,7 @@
 #include "content/common/content_constants_internal.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/input_messages.h"
+#include "content/common/memory_pressure_messages.h"
 #include "content/common/view_messages.h"
 #include "content/port/browser/render_widget_host_view_port.h"
 #include "content/public/browser/compositor_util.h"
@@ -173,7 +174,10 @@ RenderWidgetHostImpl::RenderWidgetHostImpl(RenderWidgetHostDelegate* delegate,
       weak_factory_(this),
       touch_event_queue_(new TouchEventQueue(this)),
       gesture_event_filter_(new GestureEventFilter(this)),
-      last_input_number_(0) {
+      last_input_number_(0),
+      memory_pressure_listener_(base::Bind(
+          &RenderWidgetHostImpl::SendMemoryPressureSignal,
+          base::Unretained(this))) {
   CHECK(delegate_);
   if (routing_id_ == MSG_ROUTING_NONE) {
     routing_id_ = process_->GetNextRoutingID();
@@ -2521,6 +2525,11 @@ void RenderWidgetHostImpl::DelayedAutoResized() {
   OnRenderAutoResized(new_size);
 }
 
+void RenderWidgetHostImpl::SendMemoryPressureSignal(
+    base::MemoryPressureListener::MemoryPressureLevel level) {
+  Send(new MemoryPressureMsg_MemoryPressure(level));
+}
+
 void RenderWidgetHostImpl::DetachDelegate() {
   delegate_ = NULL;
 }