Add architecture for simulating memory pressure notifications in all processes

content/browser/memory/memory_message_filter.h

Index: content/browser/memory/memory_message_filter.h
diff --git a/content/browser/memory/memory_message_filter.h b/content/browser/memory/memory_message_filter.h
index 122a7aa9cec2035bb92978ddaea51c6a2d3c38ba..d489c257adfee8513d4166d5cac8b3baae955b91 100644
--- a/content/browser/memory/memory_message_filter.h
+++ b/content/browser/memory/memory_message_filter.h
@@ -5,6 +5,7 @@
 #ifndef CONTENT_BROWSER_MEMORY_MEMORY_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_MEMORY_MEMORY_MESSAGE_FILTER_H_
 
+#include "base/memory/memory_pressure_listener.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/browser_message_filter.h"
 
@@ -22,6 +23,8 @@ class CONTENT_EXPORT MemoryMessageFilter : public BrowserMessageFilter {
   bool OnMessageReceived(const IPC::Message& message) override;
 
   void SendSetPressureNotificationsSuppressed(bool suppressed);
+  void SendSimulatePressureNotification(
+      base::MemoryPressureListener::MemoryPressureLevel level);
 
  protected:
   ~MemoryMessageFilter() override;