Add method for simulating 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 83d47d7097e7949e2872a8aba38fc2be5dd46ae2..290657e72601112a55448e8505d2507b6d5f35a9 100644
--- a/base/memory/memory_pressure_listener.h
+++ b/base/memory/memory_pressure_listener.h
@@ -77,10 +77,14 @@ class BASE_EXPORT MemoryPressureListener {
   // measurements.
   static bool AreNotificationsSuppressed();
   static void SetNotificationsSuppressed(bool suppressed);
+  static void SimulatePressureNotification(
+      MemoryPressureLevel memory_pressure_level);
 
  private:
   void Notify(MemoryPressureLevel memory_pressure_level);
 
+  static void DoNotifyMemoryPressure(MemoryPressureLevel memory_pressure_level);
+
   MemoryPressureCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(MemoryPressureListener);