Add code path for registered custom properties in CSSInterpolationType

Add code path for registered custom properties in CSSInterpolationType

This change adds extra handling logic for registered custom properties
in CSSInterpolationType that deals with their associated CSSValues instead
of just the generic CSSCustomPropertyDeclaration values.

This is in preparation for integration with the typed subclasses
of CSSInterpolationType to produce values in between the specified
animation keyframes.

This patch is a refactor that has no change in behaviour.

BUG=671904
Review-Url: https://codereview.chromium.org/2630503002
Cr-Commit-Position: refs/heads/master@{#444271}
Committed: https://chromium.googlesource.com/chromium/src/+/271557f792311061db727bd05dcedd282c1c2272

[alancutter (OOO until 2018), 2017-01-13 09:51:36]

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

[commit-bot: I haz the power, 2017-01-13 09:51:59]

Dry run: 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, 2017-01-13 11:10:54]

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

[commit-bot: I haz the power, 2017-01-13 11:10:54]

Dry run: This issue passed the CQ dry run.

[alancutter (OOO until 2018), 2017-01-15 23:42:33]

Description was changed from

==========
WIP: Add separate code path for custom properties in CSSInterpolationType

BUG=671904
==========

to

==========
Add code path for registered custom properties in CSSInterpolationType

This change adds extra handling logic for registered custom properties
in CSSInterpolationType that deals with their associated CSSValues instead
of just the generic CSSCustomPropertyDeclaration values.

This is in preparation for integration with the typed subclasses
of CSSInterpolationType to produce values in between the specified
animation keyframes.

This patch is a refactor that has no change in behaviour.

BUG=671904
==========

[alancutter (OOO until 2018), 2017-01-15 23:42:34]

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

[alancutter (OOO until 2018), 2017-01-15 23:43:14]

+ericwilligers for InterpolationType changes.
+timloh for custom property usage.

[Eric Willigers, 2017-01-16 01:43:31]

lgtm

[Timothy Loh, 2017-01-18 02:24:29]

On 2017/01/16 01:43:31, Eric Willigers wrote:
> lgtm

lgtm

[alancutter (OOO until 2018), 2017-01-18 02:26:22]

The CQ bit was checked by alancutter@chromium.org

[commit-bot: I haz the power, 2017-01-18 02:26:55]

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, 2017-01-18 04:21:57]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1484706382128620,
"parent_rev": "21bbb69c4b34001577e76139604ccc7715089bd2", "commit_rev":
"271557f792311061db727bd05dcedd282c1c2272"}

[commit-bot: I haz the power, 2017-01-18 04:22:27]

Description was changed from

==========
Add code path for registered custom properties in CSSInterpolationType

This change adds extra handling logic for registered custom properties
in CSSInterpolationType that deals with their associated CSSValues instead
of just the generic CSSCustomPropertyDeclaration values.

This is in preparation for integration with the typed subclasses
of CSSInterpolationType to produce values in between the specified
animation keyframes.

This patch is a refactor that has no change in behaviour.

BUG=671904
==========

to

==========
Add code path for registered custom properties in CSSInterpolationType

This change adds extra handling logic for registered custom properties
in CSSInterpolationType that deals with their associated CSSValues instead
of just the generic CSSCustomPropertyDeclaration values.

This is in preparation for integration with the typed subclasses
of CSSInterpolationType to produce values in between the specified
animation keyframes.

This patch is a refactor that has no change in behaviour.

BUG=671904

Review-Url: https://codereview.chromium.org/2630503002
Cr-Commit-Position: refs/heads/master@{#444271}
Committed:
https://chromium.googlesource.com/chromium/src/+/271557f792311061db727bd05dce...
==========

[commit-bot: I haz the power, 2017-01-18 04:22:28]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/271557f792311061db727bd05dce...