Lazily instantiate Geolocation permission manager maps.

Lazily instantiate Geolocation permission manager maps.

Delay creating the bidirectional maps needed to handle Geolocation
permission requests until actually used. To avoid instantiating a
pair of Persistent<> references when doing so, move the wrapper
private object to the Oilpan heap.

R=haraken,tkent
BUG=340522
Committed: https://crrev.com/261b97814d16304029bf9979cf98fe46d7c76b92
git-svn-id: svn://svn.chromium.org/blink/trunk@202336 bbb929c8-8fbe-4397-9dbb-9b2b20218538

[sof, 2015-09-15 14:29:39]

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

[sof, 2015-09-15 14:29:39]

please take a look.

No need to populate the main thread's PersistentRegion unnecessarily.

[haraken, 2015-09-15 14:54:34]

LGTM

[tkent, 2015-09-15 22:24:54]

lgtm

[sof, 2015-09-16 05:09:19]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2015-09-16 05:09:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1339353002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1339353002/1

[sof, 2015-09-16 06:18:44]

The CQ bit was unchecked by sigbjornf@opera.com

[sof, 2015-09-16 06:18:56]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2015-09-16 06:19:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1339353002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1339353002/1

[commit-bot: I haz the power, 2015-09-16 09:59:40]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=202336

[commit-bot: I haz the power, 2015-09-23 12:54:00]

Patchset 1 (id:??) landed as
https://crrev.com/261b97814d16304029bf9979cf98fe46d7c76b92