IDL parser: Add AST tests for Constructor and Exposed

These extended attributes have uncommon structures and they need
to be handled independently.
This CL adds those tests to show how IDL parser creates AST for them.


Bug: 650150
Change-Id: I041c1c105cc877354ac1b2149d91a9888eafdcf5
Reviewed-on: https://chromium-review.googlesource.com/688256
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504903}

tools/idl_parser/test_parser/interface_web.idl

@@ -555,3 +555,70 @@ interface MyIFaceArgumentWithAnnotatedType2 {
   void voidMethodTestArgumentWithExtAttribute1([Clamp, XAttr] long long myLong);
   void voidMethodTestArgumentWithExtAttribute2([EnforceRange] long longArg);
 };
+
+/** TREE
+ *Interface(InterfaceConstructors)
+ *  ExtAttributes()
+ *    ExtAttribute(Constructor)
+ *    ExtAttribute(Constructor)
+ *      Arguments()
+ *        Argument(doubleArg)
+ *          Type()
+ *            PrimitiveType(double)
+ *    ExtAttribute(CustomConstructor)
+ *    ExtAttribute(CustomConstructor)
+ *      Arguments()
+ *        Argument(doubleArg)
+ *          Type()
+ *            PrimitiveType(double)
+ *    ExtAttribute(NamedConstructor) = "Audio"
+ *    ExtAttribute(NamedConstructor)
+ *      Call(Audio)
+ *        Arguments()
+ *          Argument(src)
+ *            Type()
+ *              StringType(DOMString)
+ */
+[
+    Constructor,
+    Constructor(double doubleArg),
+    CustomConstructor,
+    CustomConstructor(double doubleArg),
+    NamedConstructor=Audio,
+    NamedConstructor=Audio(DOMString src)
+] interface InterfaceConstructors { };
+
+/** TREE
+ *Interface(InterfaceExposed)
+ *  ExtAttributes()
+ *    ExtAttribute(Exposed) = "Window"
+ *    ExtAttribute(Exposed) = "['Window', 'Worker']"
+ *    ExtAttribute(Exposed)
+ *      Arguments()
+ *        Argument(Feature1)
+ *          Type()
+ *            Typeref(Window)
+ *    ExtAttribute(Exposed)
+ *      Arguments()
+ *        Argument(Feature1)
+ *          Type()
+ *            Typeref(Window)
+ *        Argument(Feature2)
+ *          Type()
+ *            Typeref(Worker)
+ */
+[
+    Exposed=Window,
+    Exposed=(Window, Worker),
+    Exposed(Window Feature1),
+    Exposed(Window Feature1, Worker Feature2)
+] interface InterfaceExposed { };
+
+/** TREE
+ *Interface(InterfaceExposedError)
+ *  ExtAttributes()
+ *    ExtAttribute(Exposed)
+ *      Arguments()
+ *        Error(Unexpected ,.)
+ */
+[ Exposed(Window, Worker) ] interface InterfaceExposedError { };