Reland "Make v8::TryCatch able to consume natively thrown exceptions."

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 2beea32db44fe4fe72cc319ea3d76b793b8ba9b2..e09f773a97abb56fc83d1d5306dbced5148690f2 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -750,6 +750,8 @@ class Isolate {
   // Re-set pending message, script and positions reported to the TryCatch
   // back to the TLS for re-use when rethrowing.
   void RestorePendingMessageFromTryCatch(v8::TryCatch* handler);
+  // Un-schedule an exception that was caught by a TryCatch handler.
+  void CancelScheduledExceptionFromTryCatch(v8::TryCatch* handler);
   void ReportPendingMessages();
   // Return pending location if any or unfilled structure.
   MessageLocation GetMessageLocation();