Create a new action triggered when a BeginMainFrame is not expected before vsync

cc/scheduler/scheduler.cc

Index: cc/scheduler/scheduler.cc
diff --git a/cc/scheduler/scheduler.cc b/cc/scheduler/scheduler.cc
index d532ce3b07d7478d7eea238f0df43884f7d299e5..d97877ace0d985f3d9315dba4f1319ebfa985e7f 100644
--- a/cc/scheduler/scheduler.cc
+++ b/cc/scheduler/scheduler.cc
@@ -215,6 +215,14 @@ base::TimeTicks Scheduler::LastBeginImplFrameTime() {
   return begin_impl_frame_tracker_.Current().frame_time;
 }
 
+void Scheduler::ScheduleShortIdleWork(const BeginFrameArgs& args) {

[Sami, 2017/03/30 15:30:36]

Let's rename this to BeginMainFrameNotExpectedUntil(base::TimeTicks)

[Dan Elphick, 2017/04/06 16:10:16]

Done.

+  // TODO(delphick): Do we need to log this?
+  compositor_timing_history_->BeginImplFrameNotExpectedSoon();
+
+  client_->ScheduledActionBeginMainFrameNotExpectedUntil(args.frame_time +
+                                                         args.interval);
+}
+
 void Scheduler::BeginImplFrameNotExpectedSoon() {
   compositor_timing_history_->BeginImplFrameNotExpectedSoon();
 
@@ -629,6 +637,10 @@ void Scheduler::ProcessScheduledActions() {
         // TODO(brianderson): Pass begin_main_frame_args_ directly to client.
         client_->ScheduledActionSendBeginMainFrame(begin_main_frame_args_);
         break;
+      case SchedulerStateMachine::ACTION_DO_SHORT_IDLE_WORK:
+        state_machine_.WillDoShortIdleWork();
+        ScheduleShortIdleWork(begin_main_frame_args_);
+        break;
       case SchedulerStateMachine::ACTION_COMMIT: {
         bool commit_has_no_updates = false;
         state_machine_.WillCommit(commit_has_no_updates);