Use idle time to make progress on scheduled compilation jobs

src/compiler-dispatcher/compiler-dispatcher-job.h

Index: src/compiler-dispatcher/compiler-dispatcher-job.h
diff --git a/src/compiler-dispatcher/compiler-dispatcher-job.h b/src/compiler-dispatcher/compiler-dispatcher-job.h
index 811d4fcb4edd7a200cf66fe92e078e32958a018d..0bd450164a765da3a5a4f1369d66f84596836697 100644
--- a/src/compiler-dispatcher/compiler-dispatcher-job.h
+++ b/src/compiler-dispatcher/compiler-dispatcher-job.h
@@ -83,6 +83,9 @@ class V8_EXPORT_PRIVATE CompilerDispatcherJob {
   // Transition from any state to kInitial and free all resources.
   void ResetOnMainThread();
 
+  // Estimate how long the next step will take using the tracer.
+  double EstimateRuntimeOfNextStepInMs() const;
+
  private:
   FRIEND_TEST(CompilerDispatcherJobTest, ScopeChain);