Add a finch experiment for different memory pressure management strategies in ChromeOS.

chromeos/chromeos_switches.h

Index: chromeos/chromeos_switches.h
diff --git a/chromeos/chromeos_switches.h b/chromeos/chromeos_switches.h
index 9a7ccdd43a6d992dfe05406724712a310733e311..c9eda13715941a6e0056bf06b355b9422001035e 100644
--- a/chromeos/chromeos_switches.h
+++ b/chromeos/chromeos_switches.h
@@ -88,6 +88,10 @@ CHROMEOS_EXPORT extern const char kLoginManager[];
 CHROMEOS_EXPORT extern const char kLoginProfile[];
 CHROMEOS_EXPORT extern const char kLoginUser[];
 CHROMEOS_EXPORT extern const char kMemoryPressureThresholds[];
+CHROMEOS_EXPORT extern const char kConservativeThreshold[];
+CHROMEOS_EXPORT extern const char kAggressiveCacheDiscardThreshold[];
+CHROMEOS_EXPORT extern const char kAggressiveTabDiscardThreshold[];
+CHROMEOS_EXPORT extern const char kAggressiveThreshold[];
 CHROMEOS_EXPORT extern const char kNaturalScrollDefault[];
 CHROMEOS_EXPORT extern const char kOobeGuestSession[];
 CHROMEOS_EXPORT extern const char kOobeSkipPostLogin[];
@@ -104,9 +108,6 @@ CHROMEOS_EXPORT extern const char kEnableTimeZoneTrackingOption[];
 
 CHROMEOS_EXPORT bool WakeOnWifiEnabled();
 
-CHROMEOS_EXPORT base::MemoryPressureObserverChromeOS::MemoryPressureThresholds
-GetMemoryPressureThresholds();
-
 }  // namespace switches
 }  // namespace chromeos