Set breakpoint at url, line number

runtime/vm/scanner.h

Index: runtime/vm/scanner.h
===================================================================
--- runtime/vm/scanner.h	(revision 3419)
+++ runtime/vm/scanner.h	(working copy)
@@ -51,6 +51,7 @@
 
   // Initializes scanner to scan string source.
   Scanner(const String& source, const String& private_key);
+  ~Scanner();
 
   // Scans one token at a time.
   void Scan();
@@ -59,6 +60,10 @@
   // Use CurrentPosition() to extract position.
   void ScanTo(intptr_t token_index);
 
+  // Returns token index of first token on or after given line number.
+  // Returns negative value if no token exists on or after the line.
+  intptr_t TokenIndexAtLine(intptr_t line_number);
+
   // Scans entire source and returns a stream of tokens.
   // Should be called only once.
   const GrowableTokenStream& GetStream();
@@ -97,6 +102,9 @@
     String* keyword_symbol;
   };
 
+  // Rewind scanner position to token 0.
+  void Reset();
+
   // Initialize Scanner tables.
   void InitKeywordTable();