Restore order of LayoutObject fields before crrev.com/402384

Restore order of LayoutObject fields before crrev.com/402384

In crrev.com/402384 we changed the order of LayoutObject fields
to avoid memory gaps on 64-bit systems (which actually didn't work
because it just moves the gap to after the fields). It caused
performance regression of blink_perf.css.FocusUpdate on some
Android devices, perhaps because of changed cache behavior.

Restore the original LayoutObject field order.

BUG=624241
Committed: https://crrev.com/6b109b4d67f5a3e18947b192f661f34f54e5f922
Cr-Commit-Position: refs/heads/master@{#410229}

[Xianzhu, 2016-08-05 21:24:19]

wangxianzhu@chromium.org changed reviewers:
+ pdr@chromium.org

[Xianzhu, 2016-08-05 21:24:20]

I guess this was because the LayoutPoint and LayoutRect fields were placed at
odd 32-bit addresses, making them less efficient about cache and memory
load/store.

[chrishtr, 2016-08-05 22:50:51]

chrishtr@chromium.org changed reviewers:
+ chrishtr@chromium.org

[chrishtr, 2016-08-05 22:50:52]

lgtm

[Xianzhu, 2016-08-05 22:55:42]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2016-08-05 22:56:12]

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, 2016-08-06 00:32:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-06 00:34:30]

Description was changed from

==========
Restore order of LayoutObject fields before crrev.com/402384

In crrev.com/402384 we changed the order of LayoutObject fields
to avoid memory gaps on 64-bit systems (which actually didn't work
because it just moves the gap to after the fields). It caused
performance regression of blink_perf.css.FocusUpdate on some
Android devices, perhaps because of changed cache behavior.

Restore the original LayoutObject field order.

BUG=624241
==========

to

==========
Restore order of LayoutObject fields before crrev.com/402384

In crrev.com/402384 we changed the order of LayoutObject fields
to avoid memory gaps on 64-bit systems (which actually didn't work
because it just moves the gap to after the fields). It caused
performance regression of blink_perf.css.FocusUpdate on some
Android devices, perhaps because of changed cache behavior.

Restore the original LayoutObject field order.

BUG=624241

Committed: https://crrev.com/6b109b4d67f5a3e18947b192f661f34f54e5f922
Cr-Commit-Position: refs/heads/master@{#410229}
==========

[commit-bot: I haz the power, 2016-08-06 00:34:31]

Patchset 1 (id:??) landed as
https://crrev.com/6b109b4d67f5a3e18947b192f661f34f54e5f922
Cr-Commit-Position: refs/heads/master@{#410229}