Improve showTree() debug helper.

Improve showTree() debug helper.

* <!DOCTYPE> should be shown differently.
  Old:    html    0xhhhhhhhh
  New:    DOCTYPE html  0xhhhhhhhh

* Processing Instructions should be shown differently.
  Old:    xml-stylesheet    0xhhhhhhhh
  New:    ?xml-stylesheet   0xhhhhhhhh

* Elements and documents show editability
  Old:    body    0xhhhhhhhh
  New:    body    0xhhhhhhhh (editable)

This CL has no behaivor changes in production.

Committed: https://crrev.com/37588ee9232a0da2454eaadbd88713d60c719f24
Cr-Commit-Position: refs/heads/master@{#371758}

[tkent, 2016-01-27 07:32:59]

tkent@chromium.org changed reviewers:
+ yosin@chromium.org

[tkent, 2016-01-27 07:32:59]

yosin@, would you review this please?

[yosin_UTC9, 2016-01-27 08:24:59]

lgtm

Such a cool change! This change helps editing team very much!
(^_^)b ☺

[yosin_UTC9, 2016-01-27 08:25:06]

The CQ bit was checked by yosin@chromium.org

[commit-bot: I haz the power, 2016-01-27 08:25:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1639193002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1639193002/1

[commit-bot: I haz the power, 2016-01-27 08:30:38]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-27 08:32:05]

Description was changed from

==========
Improve showTree() debug helper.

* <!DOCTYPE> should be shown differently.
  Old:    html    0xhhhhhhhh
  New:    DOCTYPE html  0xhhhhhhhh

* Processing Instructions should be shown differently.
  Old:    xml-stylesheet    0xhhhhhhhh
  New:    ?xml-stylesheet   0xhhhhhhhh

* Elements and documents show editability
  Old:    body    0xhhhhhhhh
  New:    body    0xhhhhhhhh (editable)

This CL has no behaivor changes in production.
==========

to

==========
Improve showTree() debug helper.

* <!DOCTYPE> should be shown differently.
  Old:    html    0xhhhhhhhh
  New:    DOCTYPE html  0xhhhhhhhh

* Processing Instructions should be shown differently.
  Old:    xml-stylesheet    0xhhhhhhhh
  New:    ?xml-stylesheet   0xhhhhhhhh

* Elements and documents show editability
  Old:    body    0xhhhhhhhh
  New:    body    0xhhhhhhhh (editable)

This CL has no behaivor changes in production.

Committed: https://crrev.com/37588ee9232a0da2454eaadbd88713d60c719f24
Cr-Commit-Position: refs/heads/master@{#371758}
==========

[commit-bot: I haz the power, 2016-01-27 08:32:05]

Patchset 1 (id:??) landed as
https://crrev.com/37588ee9232a0da2454eaadbd88713d60c719f24
Cr-Commit-Position: refs/heads/master@{#371758}