Don't ignore "none" in underlying image lists for animations

Don't ignore "none" in underlying image lists for animations

This patch ensures "none" in the computed value of background-image
and -webkit-mask-image are handled by animation code. Without this
values like "url(x), none" behave like "url(x)".

This issue is currently unreachable without refactoring CSS Transitions
onto using CSSInterpolationTypes (https://codereview.chromium.org/2680923005).
The relevant test case is: animations/interpolation/background-image-interpolation.html

BUG=681424
Review-Url: https://codereview.chromium.org/2693843002
Cr-Commit-Position: refs/heads/master@{#451215}
Committed: https://chromium.googlesource.com/chromium/src/+/cbd434ef8e9ef91ca5cfd146b937b3c76a3b0f2c

[alancutter (OOO until 2018), 2017-02-16 02:52:50]

Description was changed from

==========
Don't ignore "none" in image lists for animations

BUG=681424
==========

to

==========
Don't ignore "none" in underlying image lists for animations

This patch ensures "none" in the computed value of background-image
and -webkit-mask-image are handled by animation code. Without this
values like "url(x), none" behave like "url(x)".

This issue is currently unreachable without refactoring CSS Transitions
onto using CSSInterpolationTypes (https://codereview.chromium.org/2680923005).
The relevant test case is:
animations/interpolation/background-image-interpolation.html

BUG=681424
==========

[alancutter (OOO until 2018), 2017-02-16 02:52:50]

alancutter@chromium.org changed reviewers:
+ ericwilligers@chromium.org

[Eric Willigers, 2017-02-16 04:56:06]

The CQ bit was checked by ericwilligers@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-02-16 04:56:52]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Eric Willigers, 2017-02-16 04:58:37]

On 2017/02/16 02:52:58, alancutter wrote:

Does https://codereview.chromium.org/2680923005
need a test case, or does the existing test fail without this change.

Why not include the image list changes in that change?

[alancutter (OOO until 2018), 2017-02-16 05:00:46]

On 2017/02/16 at 04:58:37, ericwilligers wrote:
> On 2017/02/16 02:52:58, alancutter wrote:
> 
> Does https://codereview.chromium.org/2680923005
> need a test case, or does the existing test fail without this change.

The existing test fails without this change.

> Why not include the image list changes in that change?

I want to keep changes to specific CSSInterpolationTypes separate from the main
refactor change to reduce the amount of things happening in one patch.

[commit-bot: I haz the power, 2017-02-16 06:59:24]

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

[commit-bot: I haz the power, 2017-02-16 06:59:25]

Dry run: Try jobs failed on following builders:
  linux_chromium_asan_rel_ng on master.tryserver.chromium.linux (JOB_TIMED_OUT,
no build URL)

[Eric Willigers, 2017-02-16 07:00:39]

lgtm

[alancutter (OOO until 2018), 2017-02-17 00:05:34]

The CQ bit was checked by alancutter@chromium.org

[commit-bot: I haz the power, 2017-02-17 00:07:36]

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, 2017-02-17 04:42:11]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1487289934093170,
"parent_rev": "ac3d037f1d7655c527fc1d0c670b986d4bd36a9e", "commit_rev":
"cbd434ef8e9ef91ca5cfd146b937b3c76a3b0f2c"}

[commit-bot: I haz the power, 2017-02-17 04:42:44]

Description was changed from

==========
Don't ignore "none" in underlying image lists for animations

This patch ensures "none" in the computed value of background-image
and -webkit-mask-image are handled by animation code. Without this
values like "url(x), none" behave like "url(x)".

This issue is currently unreachable without refactoring CSS Transitions
onto using CSSInterpolationTypes (https://codereview.chromium.org/2680923005).
The relevant test case is:
animations/interpolation/background-image-interpolation.html

BUG=681424
==========

to

==========
Don't ignore "none" in underlying image lists for animations

This patch ensures "none" in the computed value of background-image
and -webkit-mask-image are handled by animation code. Without this
values like "url(x), none" behave like "url(x)".

This issue is currently unreachable without refactoring CSS Transitions
onto using CSSInterpolationTypes (https://codereview.chromium.org/2680923005).
The relevant test case is:
animations/interpolation/background-image-interpolation.html

BUG=681424

Review-Url: https://codereview.chromium.org/2693843002
Cr-Commit-Position: refs/heads/master@{#451215}
Committed:
https://chromium.googlesource.com/chromium/src/+/cbd434ef8e9ef91ca5cfd146b937...
==========

[commit-bot: I haz the power, 2017-02-17 04:42:45]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/cbd434ef8e9ef91ca5cfd146b937...