HTML parser: Add show/toString() debug helper methods

HTML parser: Add show/toString() debug helper methods

These methods are useful when debugging the HTML parser.
They are only enabled on Debug builds, and should not affect any release.

BUG=None

Committed: https://crrev.com/41994c3252578f5ac2489935d84fb6c1c08b15a2
Cr-Commit-Position: refs/heads/master@{#405683}

[kouhei (in TOK), 2016-07-14 07:54:41]

kouhei@chromium.org changed reviewers:
+ yoav@yoav.ws

[kouhei (in TOK), 2016-07-14 07:54:50]

The CQ bit was checked by kouhei@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-07-14 07:55:10]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-14 09:34:33]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-07-14 09:34:34]

Dry run: Try jobs failed on following builders:
  win_chromium_x64_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[kouhei (in TOK), 2016-07-15 01:14:31]

kouhei@chromium.org changed reviewers:
+ dominicc@chromium.org, haraken@chromium.org

[kouhei (in TOK), 2016-07-15 01:14:31]

r?

[haraken, 2016-07-15 01:48:33]

LGTM

[kouhei (in TOK), 2016-07-15 01:48:54]

The CQ bit was checked by kouhei@chromium.org

[commit-bot: I haz the power, 2016-07-15 01:49:08]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-15 02:33:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-15 02:35:49]

Description was changed from

==========
HTML parser: Add show/toString() debug helper methods

These methods are useful when debugging the HTML parser.
They are only enabled on Debug builds, and should not affect any release.

BUG=None
==========

to

==========
HTML parser: Add show/toString() debug helper methods

These methods are useful when debugging the HTML parser.
They are only enabled on Debug builds, and should not affect any release.

BUG=None

Committed: https://crrev.com/41994c3252578f5ac2489935d84fb6c1c08b15a2
Cr-Commit-Position: refs/heads/master@{#405683}
==========

[commit-bot: I haz the power, 2016-07-15 02:35:50]

Patchset 1 (id:??) landed as
https://crrev.com/41994c3252578f5ac2489935d84fb6c1c08b15a2
Cr-Commit-Position: refs/heads/master@{#405683}