Pass Isolate to CodeAgingHelper

Pass Isolate to CodeAgingHelper

This is a preparation for requiring an isolate to construct a
CodePatcher

BUG=2487
R=epertoso@chromium.org
LOG=n

Committed: https://crrev.com/7ba6bb4e3b1510ce78280ad66dda2ecea0e2ec30
Cr-Commit-Position: refs/heads/master@{#32283}

[epertoso, 2015-11-25 14:35:41]

lgtm

[jochen (gone - plz use gerrit), 2015-11-25 14:38:58]

The CQ bit was checked by jochen@chromium.org

[commit-bot: I haz the power, 2015-11-25 14:39:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1480573002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1480573002/1

[commit-bot: I haz the power, 2015-11-25 15:24:54]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-25 15:25:22]

Patchset 1 (id:??) landed as
https://crrev.com/7ba6bb4e3b1510ce78280ad66dda2ecea0e2ec30
Cr-Commit-Position: refs/heads/master@{#32283}