Avoid Context::Enter and Context::Exit if we're reentering the active and last entered context

Avoid Context::Enter and Context::Exit if we're reentering the active and last entered context

A bit of browsing around indicates that the new fast-path is taken most of the time:
   3496 Entering new
 152295 Reentering same

BUG=

Committed: https://crrev.com/1829eb661ef1cf432fb551bcb193f521a219d490
Cr-Commit-Position: refs/heads/master@{#37570}

[Toon Verwaest, 2016-07-07 05:34:01]

Description was changed from

==========
Avoid Context::Enter and Context::Exit if we're reentering the active and last
entered context

BUG=
==========

to

==========
Avoid Context::Enter and Context::Exit if we're reentering the active and last
entered context

A bit of browsing around indicates that the new fast-path is taken most of the
time:
   3496 Entering new
 152295 Reentering same


BUG=
==========

[Toon Verwaest, 2016-07-07 06:16:40]

verwaest@chromium.org changed reviewers:
+ jochen@chromium.org

[Toon Verwaest, 2016-07-07 06:16:40]

ptal

[jochen (gone - plz use gerrit), 2016-07-07 06:25:13]

lgtm

[Toon Verwaest, 2016-07-07 07:13:28]

The CQ bit was checked by verwaest@chromium.org

[commit-bot: I haz the power, 2016-07-07 07:13:36]

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, 2016-07-07 07:35:40]

Description was changed from

==========
Avoid Context::Enter and Context::Exit if we're reentering the active and last
entered context

A bit of browsing around indicates that the new fast-path is taken most of the
time:
   3496 Entering new
 152295 Reentering same


BUG=
==========

to

==========
Avoid Context::Enter and Context::Exit if we're reentering the active and last
entered context

A bit of browsing around indicates that the new fast-path is taken most of the
time:
   3496 Entering new
 152295 Reentering same


BUG=
==========

[commit-bot: I haz the power, 2016-07-07 07:35:41]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-07-07 07:38:00]

Description was changed from

==========
Avoid Context::Enter and Context::Exit if we're reentering the active and last
entered context

A bit of browsing around indicates that the new fast-path is taken most of the
time:
   3496 Entering new
 152295 Reentering same


BUG=
==========

to

==========
Avoid Context::Enter and Context::Exit if we're reentering the active and last
entered context

A bit of browsing around indicates that the new fast-path is taken most of the
time:
   3496 Entering new
 152295 Reentering same

BUG=

Committed: https://crrev.com/1829eb661ef1cf432fb551bcb193f521a219d490
Cr-Commit-Position: refs/heads/master@{#37570}
==========

[commit-bot: I haz the power, 2016-07-07 07:38:05]

Patchset 2 (id:??) landed as
https://crrev.com/1829eb661ef1cf432fb551bcb193f521a219d490
Cr-Commit-Position: refs/heads/master@{#37570}

[haraken, 2016-07-07 08:41:58]

Great, LGTM!

[Jakob Kummerow, 2016-07-11 10:01:49]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/2140563002/ by jkummerow@chromium.org.

The reason for reverting is: crashes: crbug.com/626719.