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
Commit-Queue: Hitoshi Yoshida <>
Reviewed-by: Kenichi Ishibashi <>
Cr-Original-Commit-Position: refs/heads/master@{#504903}
Cr-Mirrored-Commit: 1d9e6ea1b1d579d7818f285ccd025cc3fbee16c1
1 file changed