Support Promise<T> syntax in the IDL parser.

tools/idl_parser/idl_lexer.py

Index: tools/idl_parser/idl_lexer.py
diff --git a/tools/idl_parser/idl_lexer.py b/tools/idl_parser/idl_lexer.py
index 9c320d6e3c8e0cc0f093fb37b5a0b7e557670bf4..5ba1d4e4e9e74ef34d6912451cefeb70e881b7f3 100755
--- a/tools/idl_parser/idl_lexer.py
+++ b/tools/idl_parser/idl_lexer.py
@@ -93,7 +93,8 @@ class IDLLexer(object):
     'octet' : 'OCTET',
     'optional' : 'OPTIONAL',
     'or' : 'OR',
-    'partial'  : 'PARTIAL',
+    'partial' : 'PARTIAL',
+    'Promise' : 'PROMISE',

[Jens Widell, 2014/10/15 07:22:17]

Maybe add a removal of it to idl_ppapi_lexer.py as well? Though, to be honest, I
don't know how important that is, or if that lexer/parser combo is even used.

I'm sure Noel knows more about that.

[noelallen1, 2014/10/15 18:12:32]

Not sure what you mean by removal.

[Jens Widell, 2014/10/15 18:16:47]

A bunch of keywords are deleted in IDLPPAPILexer's constructor, with the comment
"Remove JS types". If promises are considered a "JS type", then it might make
sense to remove it too.

But I don't know. I'm sure you do. :-)

[yhirano, 2014/10/16 05:25:46]

Done.

     'readonly' : 'READONLY',
     'RegExp' : 'REGEXP',
     'sequence' : 'SEQUENCE',