Add method for simulating MemoryPressureListener notifications

base/memory/memory_pressure_listener.cc

Index: base/memory/memory_pressure_listener.cc
diff --git a/base/memory/memory_pressure_listener.cc b/base/memory/memory_pressure_listener.cc
index 8071d378ec00a2d4176c60b8d12a87a138f01a58..9fd675aa4e52a0dd679c0d26456da990c31589d3 100644
--- a/base/memory/memory_pressure_listener.cc
+++ b/base/memory/memory_pressure_listener.cc
@@ -60,8 +60,7 @@ void MemoryPressureListener::NotifyMemoryPressure(
       "level", memory_pressure_level);
   if (AreNotificationsSuppressed())
     return;
-  g_observers.Get().Notify(FROM_HERE, &MemoryPressureListener::Notify,
-                           memory_pressure_level);
+  DoNotifyMemoryPressure(memory_pressure_level);
 }
 
 // static
@@ -74,4 +73,19 @@ void MemoryPressureListener::SetNotificationsSuppressed(bool suppress) {
   subtle::Release_Store(&g_notifications_suppressed, suppress ? 1 : 0);
 }
 
+// static
+void MemoryPressureListener::SimulatePressureNotification(
+    MemoryPressureLevel memory_pressure_level) {
+  // Notify all listeners even if regular pressure notifications are suppressed.
+  DoNotifyMemoryPressure(memory_pressure_level);
+}
+
+// static
+void MemoryPressureListener::DoNotifyMemoryPressure(
+    MemoryPressureLevel memory_pressure_level) {
+  DCHECK_NE(memory_pressure_level, MEMORY_PRESSURE_LEVEL_NONE);
+  g_observers.Get().Notify(FROM_HERE, &MemoryPressureListener::Notify,
+                           memory_pressure_level);
+}
+
 }  // namespace base