Speed up key_silk_cases masonry, re-layout x30 for stability

Speed up key_silk_cases masonry page so it doesn't mask regressions in other pages.

Re-layout 30 times so that averages are more stable.

CL for perf tryjob: https://codereview.chromium.org/1064683002
https://codereview.chromium.org/1064723002

Committed: https://crrev.com/9cd6e0dccc8918b56d2d38bf1cbc72bfa3e324fd
Cr-Commit-Position: refs/heads/master@{#324259}

[benjhayden, 2015-04-06 21:36:52]

benjhayden@chromium.org changed reviewers:
+ nednguyen@google.com

[nednguyen, 2015-04-06 21:46:03]

nednguyen@google.com changed reviewers:
+ aiolos@chromium.org, vmiura@chromium.org

[nednguyen, 2015-04-06 21:46:03]

lgtm

+Sheriff, this may cause regression.

[benjhayden, 2015-04-06 22:06:05]

Patchset #2 (id:20001) has been deleted

[benjhayden, 2015-04-06 22:09:00]

Sorry, Ned, re-review?
Patch 2 does layout 10 times for stability.

[nednguyen, 2015-04-06 22:14:38]

On 2015/04/06 22:09:00, benjhayden_chromium wrote:
> Sorry, Ned, re-review?
> Patch 2 does layout 10 times for stability.

Hi Ben, for cases like these, would you mind update the patch title so it's
easier to keep track of how the patch changes through time?

[benjhayden, 2015-04-06 23:09:06]

On 2015/04/06 at 22:14:38, nednguyen wrote:
> On 2015/04/06 22:09:00, benjhayden_chromium wrote:
> > Sorry, Ned, re-review?
> > Patch 2 does layout 10 times for stability.
> 
> Hi Ben, for cases like these, would you mind update the patch title so it's
easier to keep track of how the patch changes through time?

Sure, sorry.

[nednguyen, 2015-04-06 23:29:49]

On 2015/04/06 23:09:06, benjhayden_chromium wrote:
> On 2015/04/06 at 22:14:38, nednguyen wrote:
> > On 2015/04/06 22:09:00, benjhayden_chromium wrote:
> > > Sorry, Ned, re-review?
> > > Patch 2 does layout 10 times for stability.
> > 
> > Hi Ben, for cases like these, would you mind update the patch title so it's
> easier to keep track of how the patch changes through time?
> 
> Sure, sorry.

I am not benchmark author, so defer reviewing this to Victor. Feel free to ping
me when you need stamp to land this.

[nednguyen, 2015-04-06 23:29:50]

On 2015/04/06 23:09:06, benjhayden_chromium wrote:
> On 2015/04/06 at 22:14:38, nednguyen wrote:
> > On 2015/04/06 22:09:00, benjhayden_chromium wrote:
> > > Sorry, Ned, re-review?
> > > Patch 2 does layout 10 times for stability.
> > 
> > Hi Ben, for cases like these, would you mind update the patch title so it's
> easier to keep track of how the patch changes through time?
> 
> Sure, sorry.

I am not benchmark author, so defer reviewing this to Victor. Feel free to ping
me when you need stamp to land this.

[vmiura, 2015-04-07 02:29:43]

How stable is the metric with 10 reps?  30 or 60 seems reasonable too.

Otherwise lgtm.

[benjhayden, 2015-04-08 17:11:06]

The CQ bit was checked by benjhayden@chromium.org

[benjhayden, 2015-04-08 17:11:06]

The patchset sent to the CQ was uploaded after l-g-t-m from
nednguyen@google.com, vmiura@chromium.org
Link to the patchset: https://codereview.chromium.org/1067623002/#ps80001
(title: "relayout x30")

[commit-bot: I haz the power, 2015-04-08 17:12:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1067623002/80001

[commit-bot: I haz the power, 2015-04-08 18:47:29]

Committed patchset #4 (id:80001)

[commit-bot: I haz the power, 2015-04-08 18:48:28]

Patchset 4 (id:??) landed as
https://crrev.com/9cd6e0dccc8918b56d2d38bf1cbc72bfa3e324fd
Cr-Commit-Position: refs/heads/master@{#324259}