Avoid unnecessary DocumentElementSetMap hash table updates.

Avoid unnecessary DocumentElementSetMap hash table updates.

Alter the representation of the singleton map used to track the
correspondence between Documents and their media elements.

Additions and removals become slightly cheaper as a result.

R=
BUG=

Committed: https://crrev.com/297e542070abc169e85084acb4f45adb5ef7a3cb
Cr-Commit-Position: refs/heads/master@{#385126}

[sof, 2016-04-05 07:02:35]

sigbjornf@opera.com changed reviewers:
+ oilpan-reviews@chromium.org

[sof, 2016-04-05 07:02:36]

please take a look.

HeapHashMaps with HeapHashMap part objects as values doesn't buy us much here.

[haraken, 2016-04-05 07:03:45]

LGTM

[sof, 2016-04-05 07:44:10]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2016-04-05 07:44:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1852423003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1852423003/1

[commit-bot: I haz the power, 2016-04-05 07:56:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-05 07:57:46]

Description was changed from

==========
Avoid unnecessary DocumentElementSetMap hash table updates.

Alter the representation of the singleton map used to track the
correspondence between Documents and their media elements.

Additions and removals become slightly cheaper as a result.

R=
BUG=
==========

to

==========
Avoid unnecessary DocumentElementSetMap hash table updates.

Alter the representation of the singleton map used to track the
correspondence between Documents and their media elements.

Additions and removals become slightly cheaper as a result.

R=
BUG=

Committed: https://crrev.com/297e542070abc169e85084acb4f45adb5ef7a3cb
Cr-Commit-Position: refs/heads/master@{#385126}
==========

[commit-bot: I haz the power, 2016-04-05 07:57:47]

Patchset 1 (id:??) landed as
https://crrev.com/297e542070abc169e85084acb4f45adb5ef7a3cb
Cr-Commit-Position: refs/heads/master@{#385126}