Support Promise<T> syntax in the IDL parser.

tools/idl_parser/test_parser/interface_web.idl

Index: tools/idl_parser/test_parser/interface_web.idl
diff --git a/tools/idl_parser/test_parser/interface_web.idl b/tools/idl_parser/test_parser/interface_web.idl
index 8d41e91f82ccc7b51eaee72d5ccba87d28abd3dd..1f0db1c67aadb407cb2bd3aff2d692159bcba430 100644
--- a/tools/idl_parser/test_parser/interface_web.idl
+++ b/tools/idl_parser/test_parser/interface_web.idl
@@ -181,3 +181,24 @@ interface MyIFaceStringifiers {
 interface MyExtendedAttributeInterface {
   [Attr, MethodIdentList=(Foo, Bar)] void method();
 };
+
+/* TREE
+ *Interface(MyIfacePromise)
+ *  Operation(method1)
+ *    Arguments()
+ *    Type()
+ *      Promise(Promise)

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

Shouldn't this be Promise(void) or
    Promise()
       PrimitiveType(void)

[yhirano, 2014/10/16 05:25:47]

Done.

+ *  Operation(method2)
+ *    Arguments()
+ *    Type()
+ *      Promise(Promise)
+ *  Operation(method3)
+ *    Arguments()
+ *    Type()
+ *      Promise(Promise)
+ */
+interface MyIfacePromise {
+  Promise<void> method1();
+  Promise<long> method2();
+  Promise method3();
+};