Implement ES6 Template Literals

src/scanner.h

Index: src/scanner.h
diff --git a/src/scanner.h b/src/scanner.h
index e626f206c74952c856d77d55b708b9e01661b1ac..46e6d32212a19e822a9ad18ab4eae35b9be90bb1 100644
--- a/src/scanner.h
+++ b/src/scanner.h
@@ -458,6 +458,8 @@ class Scanner {
   void SetHarmonyClasses(bool classes) {
     harmony_classes_ = classes;
   }
+  bool HarmonyTemplates() const { return harmony_templates_; }
+  void SetHarmonyTemplates(bool templates) { harmony_templates_ = templates; }
 
   // Returns true if there was a line terminator before the peek'ed token,
   // possibly inside a multi-line comment.
@@ -473,6 +475,9 @@ class Scanner {
   // be empty).
   bool ScanRegExpFlags();
 
+  // Scans the input as a template literal
+  Token::Value ScanTemplateSpan();
+
   const LiteralBuffer* source_url() const { return &source_url_; }
   const LiteralBuffer* source_mapping_url() const {
     return &source_mapping_url_;
@@ -681,6 +686,8 @@ class Scanner {
   bool harmony_numeric_literals_;
   // Whether we scan 'class', 'extends', 'static' and 'super' as keywords.
   bool harmony_classes_;
+  // Whether we scan TEMPLATE_SPAN and TEMPLATE_TAIL
+  bool harmony_templates_;
 };
 
 } }  // namespace v8::internal