Add basic support for Latin1 to the API.

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index 10abba731bb12c7b9adf2b40e216bb68d8f99c70..58bb4a85c2aecfe7d0ca44bc175f9603102205fd 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -120,7 +120,13 @@ class Factory {
   // flags in the parser.
   Handle<String> NewStringFromUtf8(
       Vector<const char> str,
-      PretenureFlag pretenure = NOT_TENURED);
+      PretenureFlag pretenure = NOT_TENURED,
+      String::AsciiHint ascii_hint = String::MAYBE_ASCII);
+
+  Handle<String> NewStringFromLatin1(
+      Vector<const char> str,
+      PretenureFlag pretenure = NOT_TENURED,
+      String::AsciiHint ascii_hint = String::MAYBE_ASCII);
 
   Handle<String> NewStringFromTwoByte(
       Vector<const uc16> str,