Add v8::Message::GetScriptOrigin() with tests

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 25cb84e270d93eeac051d36c51fe096a622349aa..d628a839ad806e39b1ea244e8e9ebe1569a06b05 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -1109,6 +1109,12 @@ class V8_EXPORT Message {
   Local<String> GetSourceLine() const;
 
   /**
+   * Returns the origin for the script from where the function causing the
+   * error originates.
+   */
+  ScriptOrigin GetScriptOrigin() const;
+
+  /**
    * Returns the resource name for the script from where the function causing
    * the error originates.
    */