Add WebIDL compliant parser plus tests

tools/idl_parser/test_parser/exception.idl

+/* Copyright (c) 2013 The Chromium Authors. All rights reserved.
+   Use of this source code is governed by a BSD-style license that can be
+  found in the LICENSE file. */
+
+/* Test Exception productions
+
+Run with --test to generate an AST and verify that all comments accurately
+reflect the state of the Nodes.
+
+BUILD Type(Name)
+This comment signals that a node of type <Type> is created with the
+name <Name>.
+
+ERROR Error String
+This comment signals that a error of <Error String> is generated.  The error
+is not assigned to a node, but are expected in order.
+
+PROP Key=Value
+This comment signals that a property has been set on the Node such that
+<Key> = <Value>.
+
+TREE
+Type(Name)
+  Type(Name)
+  Type(Name)
+    Type(Name)
+    ...
+This comment signals that a tree of nodes matching the BUILD comment
+symatics should exist.  This is an exact match.
+*/
+
+
+/* TREE
+ *Exception(MyExc)
+ */
+exception MyExc { };
+
+/* TREE
+ *Exception(MyExcInherit)
+ *  Inherit(Foo)
+ */
+exception MyExcInherit : Foo {};
+
+/* ERROR Unexpected keyword "exception" after keyword "partial". */
+partial exception MyExcPartial { };
+
+/* TREE
+ *Exception(MyExcBig)
+ *  ExceptionField(MyString)
+ *    Type()
+ *      PrimitiveType(DOMString)
+ *  Error(Unexpected "=" after identifier "ErrorSetLong".)
+ *  ExceptionField(MyLong)
+ *    Type()
+ *      PrimitiveType(long)
+ */
+exception MyExcBig {
+  DOMString MyString;
+  unsigned long long ErrorSetLong = 123;
+  long MyLong;
+};
+
+
+/* ERROR Unexpected "{" after keyword "exception". */
+exception {
+  DOMString? setString = null;
+};
+
+
+/* ERROR Unexpected identifier "NoColon" after identifier "ForParent". */
+exception ForParent NoColon {
+  DOMString? setString = null;
+};
+
+/* TREE
+ *Exception(MyExcConst)
+ *  Const(setString)
+ *    PrimitiveType(DOMString)
+ *    Value(NULL)
+ */
+exception MyExcConst {
+  const DOMString? setString = null;
+};
+
+
+
+