Material PDF: Drastically reduce time required to stamp complex bookmark trees

Material PDF: Drastically reduce time required to stamp complex bookmark trees

The behaviour of dom-if changed in Polymer 1.0 to make it useful for
lazily stamping complex DOM subtrees. This CL adds dom-if to
viewer-bookmark, so that child bookmarks are only created when they are
made visible. On my workstation, this cuts the time to initially render
a complex bookmarks menu from 6 seconds to 0.2 seconds.

Also, make use of reflectToAttribute to remove some single-use CSS
classes.

BUG=110020
Committed: https://crrev.com/6c47f50421211570b7549062d199b24a4cf26445
Cr-Commit-Position: refs/heads/master@{#351017}

[tsergeant, 2015-09-28 01:03:16]

tsergeant@chromium.org changed reviewers:
+ raymes@chromium.org

[tsergeant, 2015-09-28 01:03:17]

PTAL!

dom-if is a really impressive performance win here for what is essentially a
2-line change.

[raymes, 2015-09-28 02:54:41]

lgtm

[tsergeant, 2015-09-28 03:17:21]

The CQ bit was checked by tsergeant@chromium.org

[commit-bot: I haz the power, 2015-09-28 03:17:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1369163002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1369163002/1

[commit-bot: I haz the power, 2015-09-28 03:22:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-28 03:23:22]

Patchset 1 (id:??) landed as
https://crrev.com/6c47f50421211570b7549062d199b24a4cf26445
Cr-Commit-Position: refs/heads/master@{#351017}