Introduce extended mode.

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 588624b279d18cd325cec52fd5754b1f95641be3..e55c158fc2881152a8542b120823e395a2eb253e 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -72,7 +72,7 @@ class FunctionEntry BASE_EMBEDDED {
     kEndPositionIndex,
     kLiteralCountIndex,
     kPropertyCountIndex,
-    kStrictModeIndex,
+    kLanguageModeIndex,
     kSize
   };
 
@@ -83,10 +83,11 @@ class FunctionEntry BASE_EMBEDDED {
   int end_pos() { return backing_[kEndPositionIndex]; }
   int literal_count() { return backing_[kLiteralCountIndex]; }
   int property_count() { return backing_[kPropertyCountIndex]; }
-  StrictModeFlag strict_mode_flag() {
-    ASSERT(backing_[kStrictModeIndex] == kStrictMode ||
-           backing_[kStrictModeIndex] == kNonStrictMode);
-    return static_cast<StrictModeFlag>(backing_[kStrictModeIndex]);
+  LanguageMode language_mode() {
+    ASSERT(backing_[kLanguageModeIndex] == CLASSIC_MODE ||
+           backing_[kLanguageModeIndex] == STRICT_MODE ||
+           backing_[kLanguageModeIndex] == EXTENDED_MODE);
+    return static_cast<LanguageMode>(backing_[kLanguageModeIndex]);
   }
 
   bool is_valid() { return !backing_.is_empty(); }
@@ -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);
 
@@ -482,7 +483,7 @@ 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