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..5610867c7ebbe3f3fad546ab9626a827f09224c2 100644
--- a/content/browser/memory/memory_message_filter.h
+++ b/content/browser/memory/memory_message_filter.h
@@ -5,11 +5,14 @@
 #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"
 
 namespace content {
 
+using MemoryPressureLevel = base::MemoryPressureListener::MemoryPressureLevel;
+

[Primiano Tucci (use gerrit), 2015/09/28 12:47:31]

are you doing this just to avoid wrapping the line below?
This will cause to alias content::MemoryPressureLevel to base::... to whoever
includes this header. IMHO this becomes harder to read (you have to follow the
indirections) vs. just using the full base type

[petrcermak, 2015/09/28 15:39:32]

Done.

 // This class sends memory messages from the browser process.
 // See also: child_memory_message_filter.h
 class CONTENT_EXPORT MemoryMessageFilter : public BrowserMessageFilter {
@@ -22,6 +25,7 @@ class CONTENT_EXPORT MemoryMessageFilter : public BrowserMessageFilter {
   bool OnMessageReceived(const IPC::Message& message) override;
 
   void SendSetPressureNotificationsSuppressed(bool suppressed);
+  void SendSimulatePressureNotification(MemoryPressureLevel level);
 
  protected:
   ~MemoryMessageFilter() override;