Add threaded compositing mode to field trial

chrome/browser/gpu_util.h

Index: chrome/browser/gpu_util.h
diff --git a/chrome/browser/gpu_util.h b/chrome/browser/gpu_util.h
index 42e66969e69a5d7be48e2b806606ac33ebf6575d..79f69bf057b7c94015388d070e77371c96dec250 100644
--- a/chrome/browser/gpu_util.h
+++ b/chrome/browser/gpu_util.h
@@ -68,9 +68,9 @@ base::DictionaryValue* GpuInfoAsDictionaryValue();
 // Send UMA histograms about the enabled features.
 void UpdateStats();
 
-// Returs whether this client has been selected for the force-compositing-mode
-// trial.
-bool InForceCompositingModeTrial();
+// Returns whether this client has been selected for the force-compositing-mode
+// or threaded-compositor trial.
+bool InForceCompositingModeOrThreadTrial();
 
 // Sets up the force-compositing-mode field trial.
 void InitializeForceCompositingModeFieldTrial();