Added TryCatch::ReThrow method.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index bde5fdc1a2e0182345cbd7a6c7838e31ae12f695..20edbc5500e92c604414bc3e962b1c765fbe62e8 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -1197,13 +1197,21 @@ v8::TryCatch::TryCatch()
       is_verbose_(false),
       can_continue_(true),
       capture_message_(true),
+      rethrow_(false),
       js_handler_(NULL) {
   i::Top::RegisterTryCatchHandler(this);
 }
 
 
 v8::TryCatch::~TryCatch() {
-  i::Top::UnregisterTryCatchHandler(this);
+  if (rethrow_) {
+    v8::HandleScope scope;
+    v8::Local<v8::Value> exc = v8::Local<v8::Value>::New(Exception());
+    i::Top::UnregisterTryCatchHandler(this);
+    v8::ThrowException(exc);
+  } else {
+    i::Top::UnregisterTryCatchHandler(this);
+  }
 }
 
 
@@ -1217,6 +1225,13 @@ bool v8::TryCatch::CanContinue() const {
 }
 
 
+v8::Handle<v8::Value> v8::TryCatch::ReThrow() {
+  if (!HasCaught()) return v8::Local<v8::Value>();
+  rethrow_ = true;
+  return v8::Undefined();
+}
+
+
 v8::Local<Value> v8::TryCatch::Exception() const {
   if (HasCaught()) {
     // Check for out of memory exception.