Let GC select the collector when the external memory allocation limit is reached

Let GC select the collector when the external memory allocation limit is reached

BUG=none
R=hpayer@chromium.org
LOG=n

Committed: https://crrev.com/93d6216099b60e95bc816bcc913f8f841ee795b6
Cr-Commit-Position: refs/heads/master@{#29235}

[Hannes Payer (out of office), 2015-06-23 14:59:30]

On 2015/06/22 15:21:13, jochen wrote:

Lgtm

[jochen (gone - plz use gerrit), 2015-06-23 15:00:11]

The CQ bit was checked by jochen@chromium.org

[commit-bot: I haz the power, 2015-06-23 15:00:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1201993002/1

[commit-bot: I haz the power, 2015-06-23 15:02:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-23 15:02:31]

Patchset 1 (id:??) landed as
https://crrev.com/93d6216099b60e95bc816bcc913f8f841ee795b6
Cr-Commit-Position: refs/heads/master@{#29235}

[jochen (gone - plz use gerrit), 2015-06-30 15:14:16]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1215513004/ by jochen@chromium.org.

The reason for reverting is: results in a scavenge storm if scavenge doesn't
free enough memory.