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

src/isolate.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include "include/v8-debug.h"
 #include "src/allocation.h"
 #include "src/assert-scope.h"
@@ skipping 732 matching lines @@
   }
 
   // Re-throw an exception.  This involves no error reporting since
   // error reporting was handled when the exception was thrown
   // originally.
   Object* ReThrow(Object* exception);
   void ScheduleThrow(Object* exception);
   // 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();
   Object* ThrowIllegalOperation();
   Object* ThrowInvalidStringLength();
 
   // Promote a scheduled exception to pending. Asserts has_scheduled_exception.
   Object* PromoteScheduledException();
   void DoThrow(Object* exception, MessageLocation* location);
   // Checks if exception should be reported and finds out if it's
@@ skipping 763 matching lines @@
   }
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_