Revert of Use element id's for animations

Revert of Use element id's for animations (patchset #34 id:650001 of https://codereview.chromium.org/1973083002/ )

Reason for revert:
This caused: https://bugs.chromium.org/p/chromium/issues/detail?id=618286

Original issue's description:
> Use element id's for animations.
>
> The goal of this CL is to migrate cc's animation code
> away from layer id's in anticipation of SPv2. The ids
> chosen are a minor tweak on DOMNodeIds for blink.
>
> Other clients of cc may essentially continue using
> their respective layer id's as identifiers. cc itself
> remains ignorant of the semantic meaning of these ids,
> treating them as an opaque identifier.
>
> This change is extremely similar to loyso@'s earlier
> CL crrev.com/1944623002, the significant difference
> being the scheme for choosing the ids.
>
> Notable changes in this CL
>  * Introduces an ElementId structure.
>  * Augments DOMNodeIds in order to handle sub elements (eg, for scroll and link highlight layers).
>  * Removal of ElementLayers from cc
>
> BUG=616542
> CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
>
> Committed: https://crrev.com/51659f1ad58fc058ebb95907734ce6b2c887898d
> Cr-Commit-Position: refs/heads/master@{#398366}

TBR=jbroman@chromium.org,ajuma@chromium.org,bokan@chromium.org,loyso@chromium.org,rbyers@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=616542
Committed: https://crrev.com/a8f64cb037cd9b5c9eda8419d6ab778662702a6e
Cr-Commit-Position: refs/heads/master@{#398537}

[Ian Vollick, 2016-06-08 13:40:46]

The CQ bit was checked by vollick@chromium.org

[Ian Vollick, 2016-06-08 13:40:47]

Created Revert of Use element id's for animations

[commit-bot: I haz the power, 2016-06-08 13:41:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2049063002/1

[commit-bot: I haz the power, 2016-06-08 13:42:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-08 13:44:03]

Description was changed from

==========
Revert of Use element id's for animations (patchset #34 id:650001 of
https://codereview.chromium.org/1973083002/ )

Reason for revert:
This caused: https://bugs.chromium.org/p/chromium/issues/detail?id=618286

Original issue's description:
> Use element id's for animations.
> 
> The goal of this CL is to migrate cc's animation code
> away from layer id's in anticipation of SPv2. The ids
> chosen are a minor tweak on DOMNodeIds for blink.
> 
> Other clients of cc may essentially continue using
> their respective layer id's as identifiers. cc itself
> remains ignorant of the semantic meaning of these ids,
> treating them as an opaque identifier.
> 
> This change is extremely similar to loyso@'s earlier
> CL crrev.com/1944623002, the significant difference
> being the scheme for choosing the ids.
> 
> Notable changes in this CL
>  * Introduces an ElementId structure.
>  * Augments DOMNodeIds in order to handle sub elements (eg, for scroll and
link highlight layers).
>  * Removal of ElementLayers from cc
> 
> BUG=616542
> CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
> 
> Committed: https://crrev.com/51659f1ad58fc058ebb95907734ce6b2c887898d
> Cr-Commit-Position: refs/heads/master@{#398366}

TBR=jbroman@chromium.org,ajuma@chromium.org,bokan@chromium.org,loyso@chromium...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=616542
==========

to

==========
Revert of Use element id's for animations (patchset #34 id:650001 of
https://codereview.chromium.org/1973083002/ )

Reason for revert:
This caused: https://bugs.chromium.org/p/chromium/issues/detail?id=618286

Original issue's description:
> Use element id's for animations.
>
> The goal of this CL is to migrate cc's animation code
> away from layer id's in anticipation of SPv2. The ids
> chosen are a minor tweak on DOMNodeIds for blink.
>
> Other clients of cc may essentially continue using
> their respective layer id's as identifiers. cc itself
> remains ignorant of the semantic meaning of these ids,
> treating them as an opaque identifier.
>
> This change is extremely similar to loyso@'s earlier
> CL crrev.com/1944623002, the significant difference
> being the scheme for choosing the ids.
>
> Notable changes in this CL
>  * Introduces an ElementId structure.
>  * Augments DOMNodeIds in order to handle sub elements (eg, for scroll and
link highlight layers).
>  * Removal of ElementLayers from cc
>
> BUG=616542
> CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
>
> Committed: https://crrev.com/51659f1ad58fc058ebb95907734ce6b2c887898d
> Cr-Commit-Position: refs/heads/master@{#398366}

TBR=jbroman@chromium.org,ajuma@chromium.org,bokan@chromium.org,loyso@chromium...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=616542

Committed: https://crrev.com/a8f64cb037cd9b5c9eda8419d6ab778662702a6e
Cr-Commit-Position: refs/heads/master@{#398537}
==========

[commit-bot: I haz the power, 2016-06-08 13:44:05]

Patchset 1 (id:??) landed as
https://crrev.com/a8f64cb037cd9b5c9eda8419d6ab778662702a6e
Cr-Commit-Position: refs/heads/master@{#398537}