Add method for suppressing MemoryPressureListener notifications

base/memory/memory_pressure_listener.h

Index: base/memory/memory_pressure_listener.h
diff --git a/base/memory/memory_pressure_listener.h b/base/memory/memory_pressure_listener.h
index 6adaeeed7fd272224b43fd63eb0a5ffc36416abd..83d47d7097e7949e2872a8aba38fc2be5dd46ae2 100644
--- a/base/memory/memory_pressure_listener.h
+++ b/base/memory/memory_pressure_listener.h
@@ -72,6 +72,12 @@ class BASE_EXPORT MemoryPressureListener {
   // Intended for use by the platform specific implementation.
   static void NotifyMemoryPressure(MemoryPressureLevel memory_pressure_level);
 
+  // These methods should not be used anywhere else but in memory measurement
+  // code, where they are intended to maintain stable conditions across
+  // measurements.
+  static bool AreNotificationsSuppressed();
+  static void SetNotificationsSuppressed(bool suppressed);
+
  private:
   void Notify(MemoryPressureLevel memory_pressure_level);