Disable fractional scroll feature by default

Disable fractional scroll feature by default

This feature is in a half-finished state and has regressed at some point.
The primary use case will soon be addressed by bug 485650, we need to
figure out what to do about the remaining use cases (eg. scroll while
pinch-zoomed).  In the interim, don't enable / test the partial code
we have for this in blink unless the feature is explicitly enabled.
I left support in the tests (though not the expected output files)
so that we can easily find the affected tests later when we either
resume work on the feature or remove it entirely.

BUG=610460, 456622
Committed: https://crrev.com/8591ae927ed0dfafd977121533265d5cbc88a9fe
Cr-Commit-Position: refs/heads/master@{#396476}

[Rick Byers, 2016-05-26 03:07:54]

rbyers@chromium.org changed reviewers:
+ dtapuska@chromium.org

[Rick Byers, 2016-05-26 03:07:54]

Dave, PTAL

[dtapuska, 2016-05-27 13:36:52]

On 2016/05/26 03:07:54, Rick Byers wrote:
> Dave, PTAL

lgtm

[Rick Byers, 2016-05-27 15:10:06]

The CQ bit was checked by rbyers@chromium.org

[commit-bot: I haz the power, 2016-05-27 15:10:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2005193005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2005193005/20001

[commit-bot: I haz the power, 2016-05-27 15:54:50]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-05-27 15:56:12]

Description was changed from

==========
Disable fractional scroll feature by default

This feature is in a half-finished state and has regressed at some point.
The primary use case will soon be addressed by bug 485650, we need to
figure out what to do about the remaining use cases (eg. scroll while
pinch-zoomed).  In the interim, don't enable / test the partial code
we have for this in blink unless the feature is explicitly enabled.
I left support in the tests (though not the expected output files)
so that we can easily find the affected tests later when we either
resume work on the feature or remove it entirely.

BUG=610460, 456622
==========

to

==========
Disable fractional scroll feature by default

This feature is in a half-finished state and has regressed at some point.
The primary use case will soon be addressed by bug 485650, we need to
figure out what to do about the remaining use cases (eg. scroll while
pinch-zoomed).  In the interim, don't enable / test the partial code
we have for this in blink unless the feature is explicitly enabled.
I left support in the tests (though not the expected output files)
so that we can easily find the affected tests later when we either
resume work on the feature or remove it entirely.

BUG=610460, 456622

Committed: https://crrev.com/8591ae927ed0dfafd977121533265d5cbc88a9fe
Cr-Commit-Position: refs/heads/master@{#396476}
==========

[commit-bot: I haz the power, 2016-05-27 15:56:12]

Patchset 2 (id:??) landed as
https://crrev.com/8591ae927ed0dfafd977121533265d5cbc88a9fe
Cr-Commit-Position: refs/heads/master@{#396476}