Improve test coverage of unused scroll delta for cc scrolling.

Improve test coverage of unused scroll delta for cc scrolling.
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Committed: https://crrev.com/7befa9cf85342a0409502ed2c05d7610afec7844
Cr-Commit-Position: refs/heads/master@{#339070}

[tdresser, 2015-07-14 17:35:44]

tdresser@chromium.org changed reviewers:
+ reveman@chromium.org

[tdresser, 2015-07-14 17:35:44]

PTAL

I almost broke this in the process of trying to reland
https://codereview.chromium.org/1223713004/.

[reveman, 2015-07-14 18:18:21]

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

[reveman, 2015-07-14 18:18:22]

lgtm % rbyers@'s review who wrote the test

[tdresser, 2015-07-14 18:22:38]

tdresser@chromium.org changed reviewers:
+ vollick@chromium.org
- rbyers@chromium.org

[tdresser, 2015-07-14 18:22:38]

rbyers@ is out for a week and a half.
reveman@ stated he'd like a second set of eyes on this change.

vollick@, can you take a look?

[Ian Vollick, 2015-07-16 13:30:45]

On 2015/07/14 18:22:38, tdresser wrote:
> rbyers@ is out for a week and a half.
> reveman@ stated he'd like a second set of eyes on this change.
> 
> vollick@, can you take a look?

lgtm. AFAICT, this retains all of the did-scroll checks that Rick added and just
adds more to ensure that the unused scroll delta is what we expect.

[Ian Vollick, 2015-07-16 13:30:52]

The CQ bit was checked by vollick@chromium.org

[commit-bot: I haz the power, 2015-07-16 13:31:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1233193002/1

[commit-bot: I haz the power, 2015-07-16 15:21:41]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-07-16 15:21:42]

Try jobs failed on following builders:
  linux_blink_rel on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel/builds/7...)

[tdresser, 2015-07-16 16:11:24]

The CQ bit was checked by tdresser@chromium.org

[commit-bot: I haz the power, 2015-07-16 16:13:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1233193002/1

[commit-bot: I haz the power, 2015-07-16 17:47:36]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-16 17:48:29]

Patchset 1 (id:??) landed as
https://crrev.com/7befa9cf85342a0409502ed2c05d7610afec7844
Cr-Commit-Position: refs/heads/master@{#339070}