Introduce extended mode.

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 9624301fcdd65a1c4ef08f1cc89c60bd573c05e0..734aad56916962b85a9b0142432857e5b05362d1 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -76,10 +76,11 @@ class FunctionEntry BASE_EMBEDDED {
   int end_pos() { return backing_[kEndPosOffset]; }
   int literal_count() { return backing_[kLiteralCountOffset]; }
   int property_count() { return backing_[kPropertyCountOffset]; }
-  StrictModeFlag strict_mode_flag() {
-    ASSERT(backing_[kStrictModeOffset] == kStrictMode ||
-           backing_[kStrictModeOffset] == kNonStrictMode);
-    return static_cast<StrictModeFlag>(backing_[kStrictModeOffset]);
+  LanguageMode language_mode() {
+    ASSERT(backing_[kLanguageModeOffset] == CLASSIC_MODE ||
+           backing_[kLanguageModeOffset] == STRICT_MODE ||
+           backing_[kLanguageModeOffset] == EXTENDED_MODE);
+    return static_cast<LanguageMode>(backing_[kLanguageModeOffset]);
   }
 
   bool is_valid() { return backing_.length() > 0; }
@@ -92,7 +93,7 @@ class FunctionEntry BASE_EMBEDDED {
   static const int kEndPosOffset = 1;
   static const int kLiteralCountOffset = 2;
   static const int kPropertyCountOffset = 3;
-  static const int kStrictModeOffset = 4;
+  static const int kLanguageModeOffset = 4;
 };
 
 
@@ -432,7 +433,7 @@ class Parser {
   // Returns NULL if parsing failed.
   FunctionLiteral* ParseProgram(Handle<String> source,
                                 bool in_global_context,
-                                StrictModeFlag strict_mode);
+                                LanguageMode language_mode);
 
   FunctionLiteral* ParseLazy(CompilationInfo* info);
 
@@ -477,7 +478,7 @@ class Parser {
   // Called by ParseProgram after setting up the scanner.
   FunctionLiteral* DoParseProgram(Handle<String> source,
                                   bool in_global_context,
-                                  StrictModeFlag strict_mode,
+                                  LanguageMode language_mode,
                                   ZoneScope* zone_scope);
 
   // Report syntax error