Using the new MemoryPressureListener instead of the LowMemoryObserver when the enhanced memory mana…

base/chromeos/memory_pressure_observer_chromeos.h

Index: base/chromeos/memory_pressure_observer_chromeos.h
diff --git a/base/chromeos/memory_pressure_observer_chromeos.h b/base/chromeos/memory_pressure_observer_chromeos.h
index 445119efb73853c1f712dab8c85ad190ddb86f6b..7ecaef85688cb97d3b1402928cd0b2ed0a672066 100644
--- a/base/chromeos/memory_pressure_observer_chromeos.h
+++ b/base/chromeos/memory_pressure_observer_chromeos.h
@@ -24,6 +24,11 @@ class BASE_EXPORT MemoryPressureObserverChromeOS {
   MemoryPressureObserverChromeOS();
   ~MemoryPressureObserverChromeOS();
 
+  // Redo the memory pressure calculation soon and call again if a critical
+  // memory pressure prevails. Note that this call will trigger an asynchronous
+  // action which gives the system time to release memory back into the pool.
+  void ScheduleEarlyCheck();
+
   // Get the current memory pressure level.
   base::MemoryPressureListener::MemoryPressureLevel GetCurrentPressureLevel() {
     return current_memory_pressure_level_;
@@ -39,8 +44,9 @@ class BASE_EXPORT MemoryPressureObserverChromeOS {
   // May be safely called if StartObserving has not been called.
   void StopObserving();
 
-  // The function which gets periodically be called to check any changes in the
-  // memory pressure.
+  // The function which gets periodically called to check any changes in the
+  // memory pressure. It will report pressure changes as well as continuous
+  // critical pressure levels.
   void CheckMemoryPressure();
 
   // The current memory pressure.
@@ -51,6 +57,10 @@ class BASE_EXPORT MemoryPressureObserverChromeOS {
   // replaced by a kernel triggered event system (see crbug.com/381196).
   base::RepeatingTimer<MemoryPressureObserverChromeOS> timer_;
 
+  // To slow down the amount of moderate pressure event calls, this counter
+  // gets used to count the number of events since the last event occured.
+  int moderate_pressure_repeat_counter_;

[James Cook, 2014/12/19 19:38:07]

nit: maybe "moderate_pressure_repeat_count_"?

[Mr4D (OOO till 08-26), 2014/12/19 23:34:41]

Done.

+
   DISALLOW_COPY_AND_ASSIGN(MemoryPressureObserverChromeOS);
 };