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Tests in tools/idl_parser are broken as of [1] because the current IDL
parser discards comments but tests assumed that there are comment nodes
which contain test expectations. This CL is basically a revert of [1]
with following modifications:
- Introduce SpecialComments instead of Comments
- SpecialComments are Javadoc-style comment (/** ... */) and they are
  parsed to AST nodes
- Normal comments (C/C++ style; /* ... */ and // ...) are still ignored

The reason to introduce SpecialComments: If we treat normal comments as
tokens and parse them as AST nodes, we have to add a lot of custom rules
to the parser, which will mess up the parser.

[1] https://chromium-review.googlesource.com/c/544424

BUG=740524

Change-Id: I872b6c19e6b844859bbcaa48c828decda36cb300
Reviewed-on: https://chromium-review.googlesource.com/569940Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486629}