WIP: memory coordinator: Check /dev/chromeos-low-mem to determine memory condition

content/browser/memory/memory_condition_observer.cc

Index: content/browser/memory/memory_condition_observer.cc
diff --git a/content/browser/memory/memory_condition_observer.cc b/content/browser/memory/memory_condition_observer.cc
index 973eccf99825793a2ebab2381562c7f5b0a6ee4f..b08581936d360effe74ccb97b5ffa9f6b61217fe 100644
--- a/content/browser/memory/memory_condition_observer.cc
+++ b/content/browser/memory/memory_condition_observer.cc
@@ -64,6 +64,9 @@ MemoryConditionObserver::MemoryConditionObserver(
     MemoryCoordinatorImpl* coordinator,
     scoped_refptr<base::SingleThreadTaskRunner> task_runner)
     : coordinator_(coordinator), task_runner_(task_runner) {
+#if defined(OS_CHROMEOS)
+  low_memory_observer_ = base::MakeUnique<base::chromeos::LowMemoryObserver>();
+#endif
   DCHECK(coordinator_);
   InitializeParameters();
   DCHECK(ValidateParameters());
@@ -95,6 +98,11 @@ void MemoryConditionObserver::SetMonitoringInterval(base::TimeDelta interval) {
 }
 
 MemoryCondition MemoryConditionObserver::CalculateNextCondition() {
+#if defined(OS_CHROMEOS)
+  if (low_memory_observer_->IsLowMemoryCondition())
+    return MemoryCondition::CRITICAL;
+#endif
+
   int available =
       coordinator_->memory_monitor()->GetFreeMemoryUntilCriticalMB();