Add line table command to debugger

runtime/include/dart_debugger_api.h

Index: runtime/include/dart_debugger_api.h
===================================================================
--- runtime/include/dart_debugger_api.h	(revision 21008)
+++ runtime/include/dart_debugger_api.h	(working copy)
@@ -142,6 +142,28 @@
 
 
 /**
+ * Returns an array containing line number and token offset info
+ * for the given script.
+ *
+ * Returns an array of numbers. Null values indicate the beginning of
+ * a new line. The first number after null is the line number.
+ * The line number is followed by pairs of numbers, with the first value
+ * being the "token offset" and the second value being the character offset
+ * of the token relative to the beginning of the script.
+ * The "token offset" is a value that is used to indicate a location
+ * in code, similarly to a "PC" address.
+ * Source lines with no tokens are omitted.
+ *
+ * Requires there to be a current isolate.
+ *
+ * \return A handle to an array or an error object.
+ */
+DART_EXPORT Dart_Handle Dart_ScriptGetTokenInfo(
+                            intptr_t library_id,
+                            Dart_Handle script_url_in);
+
+
+/**
  * Returns a string containing a generated source code of the given script
  * in the given library. This is essentially used to pretty print dart code
  * generated from any tool (e.g: dart2dart).