Add feature for main frame before activation.

Add feature for main frame before activation.

This CL adds a feature "MainFrameBeforeActivation" which can be
controlled via finch. This CL also moves the MFBA decision to the
browser which is based on enable/disable flags, number of cpu cores and
finch. The feature is always disabled for devices with fewer than 4
cores.

R=piman@chromium.org
BUG=612596
Committed: https://crrev.com/3fe3c9880734a233958d7d68750d785daa439835
Cr-Commit-Position: refs/heads/master@{#394281}

[sunnyps, 2016-05-17 21:42:26]

PTAL

[piman, 2016-05-17 21:45:48]

lgtm

[sunnyps, 2016-05-17 22:20:06]

The CQ bit was checked by sunnyps@chromium.org

[sunnyps, 2016-05-17 22:20:06]

The patchset sent to the CQ was uploaded after l-g-t-m from piman@chromium.org
Link to the patchset: https://codereview.chromium.org/1986843003/#ps20001
(title: "fix compile error")

[commit-bot: I haz the power, 2016-05-17 22:20:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1986843003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1986843003/20001

[commit-bot: I haz the power, 2016-05-18 00:22:57]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-05-18 00:24:46]

Description was changed from

==========
Add feature for main frame before activation.

This CL adds a feature "MainFrameBeforeActivation" which can be
controlled via finch. This CL also moves the MFBA decision to the
browser which is based on enable/disable flags, number of cpu cores and
finch. The feature is always disabled for devices with fewer than 4
cores.

R=piman@chromium.org
BUG=612596
==========

to

==========
Add feature for main frame before activation.

This CL adds a feature "MainFrameBeforeActivation" which can be
controlled via finch. This CL also moves the MFBA decision to the
browser which is based on enable/disable flags, number of cpu cores and
finch. The feature is always disabled for devices with fewer than 4
cores.

R=piman@chromium.org
BUG=612596

Committed: https://crrev.com/3fe3c9880734a233958d7d68750d785daa439835
Cr-Commit-Position: refs/heads/master@{#394281}
==========

[commit-bot: I haz the power, 2016-05-18 00:24:47]

Patchset 2 (id:??) landed as
https://crrev.com/3fe3c9880734a233958d7d68750d785daa439835
Cr-Commit-Position: refs/heads/master@{#394281}