Add a flag to lexer-shell to replicate input file.

src/lexer/experimental-scanner.h

Index: src/lexer/experimental-scanner.h
diff --git a/src/lexer/experimental-scanner.h b/src/lexer/experimental-scanner.h
index 9ff5e479d757f26fdcbaed71da7292b65578c0ee..849f5a034039b8e30da4a0b520fc4ca90d3a1940 100644
--- a/src/lexer/experimental-scanner.h
+++ b/src/lexer/experimental-scanner.h
@@ -62,7 +62,8 @@ class ExperimentalScanner {
 
   ExperimentalScanner(const char* fname,
                       bool read_all_at_once,
-                      Isolate* isolate);
+                      Isolate* isolate,
+                      int repeat);
   ~ExperimentalScanner();
 
   Token::Value Next();
@@ -88,6 +89,8 @@ class ExperimentalScanner {
   int length_;
 };
 
+const byte* ReadFile(const char* name, Isolate* isolate, int* size, int repeat);
+
 } }  // namespace v8::internal
 
 #endif