Parser: Make skipping HTML comments optional.

src/parsing/scanner.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Features shared by parsing and pre-parsing scanners.
 
 #ifndef V8_PARSING_SCANNER_H_
 #define V8_PARSING_SCANNER_H_
 
 #include "src/allocation.h"
@@ skipping 322 matching lines @@
 
     static Location invalid() { return Location(-1, -1); }
 
     int beg_pos;
     int end_pos;
   };
 
   // -1 is outside of the range of any real source code.
   static const int kNoOctalLocation = -1;
 
-  explicit Scanner(UnicodeCache* scanner_contants);
+  Scanner(UnicodeCache* scanner_contants, bool allow_html_comments);
 
   void Initialize(Utf16CharacterStream* source);
 
   // Returns the next token and advances input.
   Token::Value Next();
   // Returns the token following peek()
   Token::Value PeekAhead();
   // Returns the current token again.
   Token::Value current_token() { return current_.token; }
   // Returns the location information for the current token
@@ skipping 400 matching lines @@
   // One Unicode character look-ahead; c0_ < 0 at the end of the input.
   uc32 c0_;
 
   // Whether there is a line terminator whitespace character after
   // the current token, and  before the next. Does not count newlines
   // inside multiline comments.
   bool has_line_terminator_before_next_;
   // Whether there is a multi-line comment that contains a
   // line-terminator after the current token, and before the next.
   bool has_multiline_comment_before_next_;
+  // Whether to allow HTML comments (that is, skip over them, rather than
+  // reporting the comment marker as a sequence of tokens.)
+  bool allow_html_comments_;
 
   // Whether this scanner encountered an HTML comment.
   bool found_html_comment_;
 
   bool allow_harmony_exponentiation_operator_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_SCANNER_H_