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

content/browser/memory/memory_condition_observer.h

Index: content/browser/memory/memory_condition_observer.h
diff --git a/content/browser/memory/memory_condition_observer.h b/content/browser/memory/memory_condition_observer.h
index 8fae355c3b55a6dc2cb8d51d1f3deadbdc9c8cef..ab7954da3ad94098d15cc7c6de48caba879dc234 100644
--- a/content/browser/memory/memory_condition_observer.h
+++ b/content/browser/memory/memory_condition_observer.h
@@ -11,6 +11,10 @@
 #include "content/browser/memory/memory_coordinator_impl.h"
 #include "content/common/content_export.h"
 
+#if defined(OS_CHROMEOS)
+#include "base/memory/low_memory_observer_chromeos.h"
+#endif
+
 namespace content {
 
 // MemoryConditionObserver is an internal implementation of MemoryCoordinator
@@ -60,6 +64,10 @@ class CONTENT_EXPORT MemoryConditionObserver {
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   base::CancelableClosure update_condition_closure_;
 
+#if defined(OS_CHROMEOS)
+  std::unique_ptr<base::chromeos::LowMemoryObserver> low_memory_observer_;
+#endif
+
   // Sets up parameters for the heuristic.
   void InitializeParameters();