Sample allocation rate in memory reducer.

Sample allocation rate in memory reducer.

Otherwise, if there is no GC and no idle notification,
memory reducer will use old allocation rate.

BUG=chromium:515873
LOG=NO

Committed: https://crrev.com/ddcec9f6bf50779bc23bf43b731c0699cc19c4ea
Cr-Commit-Position: refs/heads/master@{#30059}

[ulan, 2015-08-06 12:09:49]

ulan@chromium.org changed reviewers:
+ hpayer@chromium.org

[ulan, 2015-08-06 12:09:49]

PTAL

[Hannes Payer (out of office), 2015-08-06 12:28:39]

lgtm

[ulan, 2015-08-06 13:10:53]

The CQ bit was checked by ulan@chromium.org

[commit-bot: I haz the power, 2015-08-06 13:11:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1280623002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1280623002/1

[commit-bot: I haz the power, 2015-08-06 13:14:17]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-06 13:14:17]

Try jobs failed on following builders:
  v8_presubmit on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_presubmit/builds/4734)

[ulan, 2015-08-07 09:22:41]

The CQ bit was checked by ulan@chromium.org

[commit-bot: I haz the power, 2015-08-07 09:22:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1280623002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1280623002/1

[commit-bot: I haz the power, 2015-08-07 09:24:27]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-07 09:24:49]

Patchset 1 (id:??) landed as
https://crrev.com/ddcec9f6bf50779bc23bf43b731c0699cc19c4ea
Cr-Commit-Position: refs/heads/master@{#30059}