Add architecture for simulating memory pressure notifications in all processes

content/child/memory/child_memory_message_filter.cc

Index: content/child/memory/child_memory_message_filter.cc
diff --git a/content/child/memory/child_memory_message_filter.cc b/content/child/memory/child_memory_message_filter.cc
index 1f3515997714eee9fb3e9146f31adbcd6b645288..95da9d7e095afdd9157b6788fc61ec5f9489b720 100644
--- a/content/child/memory/child_memory_message_filter.cc
+++ b/content/child/memory/child_memory_message_filter.cc
@@ -4,7 +4,6 @@
 
 #include "content/child/memory/child_memory_message_filter.h"
 
-#include "base/memory/memory_pressure_listener.h"
 #include "content/common/memory_messages.h"
 
 namespace content {
@@ -18,6 +17,8 @@ bool ChildMemoryMessageFilter::OnMessageReceived(const IPC::Message& message) {
   IPC_BEGIN_MESSAGE_MAP(ChildMemoryMessageFilter, message)
     IPC_MESSAGE_HANDLER(MemoryMsg_SetPressureNotificationsSuppressed,
                         OnSetPressureNotificationsSuppressed)
+    IPC_MESSAGE_HANDLER(MemoryMsg_SimulatePressureNotification,
+                        OnSimulatePressureNotification)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -29,4 +30,10 @@ void ChildMemoryMessageFilter::OnSetPressureNotificationsSuppressed(
   base::MemoryPressureListener::SetNotificationsSuppressed(suppressed);
 }
 
+void ChildMemoryMessageFilter::OnSimulatePressureNotification(
+    MemoryPressureLevel level) {
+  // Simulate a memory pressure notification in the child process.
+  base::MemoryPressureListener::SimulatePressureNotification(level);
+}
+
 }  // namespace content