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bind-gen: Implement attribute callback (2 of N)

This patch implements attribute callback a little more, and also
does the following things.

- Sort helper functions in alphabetically
- s/LiteralNode/TextNode/
  TextNode works just fine for almost all cases, and faster than
  LiteralNode.

XxxxAttribute{Getter,Setter}Callback of the old bindings
generator is mostly covered in this patch.

Bug: 839389
Change-Id: I1aa75335766f069a130c9d96ee47a6bca0a1b783
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906486
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714178}