Scheduler: Switch from high to low latency mode if possible.

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 1a284f187d5c1ac2193fcf7e9baf1c24d0c6ae73..5a5053c26e3dab7390bc0ec13e6b69e28c1e29e5 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -102,6 +102,9 @@ class CC_EXPORT Scheduler {
   bool ManageTilesPending() const {
     return state_machine_.ManageTilesPending();
   }
+  bool MainThreadIsInHighLatencyMode() const {
+    return state_machine_.MainThreadIsInHighLatencyMode();
+  }
 
   bool WillDrawIfNeeded() const;
 
@@ -133,6 +136,8 @@ class CC_EXPORT Scheduler {
   void DrawAndReadback();
   void ProcessScheduledActions();
 
+  bool CanCommitAndActivateBeforeDeadline() const;
+
   const SchedulerSettings settings_;
   SchedulerClient* client_;