Revert of Only promote opaque scrollers which are stacking contexts.

Revert of Only promote opaque scrollers which are stacking contexts. (patchset #9 id:170001 of https://codereview.chromium.org/2509203002/ )

Reason for revert:
Broke test: svg/as-background-image/svg-width-100p-as-background.html

Original issue's description:
> Only promote opaque scrollers which are stacking contexts.
>
> Promoting a scroller which is not a stacking context means that any positioned
> descendant must be promoted which will lose LCD text unless it is also opaque.
>
> BUG=666147
> TEST=PaintLayerScrollableAreaTest.NonContainedLayersNotPromoted
> CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
>
> Committed: https://crrev.com/9a94cf9be5c058b5007811e9c42aabed46a5d944
> Cr-Commit-Position: refs/heads/master@{#433578}

TBR=schenney@chromium.org,chrishtr@chromium.org,flackr@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=666147
Committed: https://crrev.com/0f2de9ef4e82c36545373c679f722a6373686351
Cr-Commit-Position: refs/heads/master@{#433596}

[mdjones, 2016-11-21 19:00:58]

The CQ bit was checked by mdjones@chromium.org

[mdjones, 2016-11-21 19:00:59]

Created Revert of Only promote opaque scrollers which are stacking contexts.

[commit-bot: I haz the power, 2016-11-21 19:01:33]

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, 2016-11-21 19:04:19]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1479754858909650, "parent_rev":
"9bbb296effb5fa26ec12da8f2e549ebac977a417", "commit_rev":
"2e9cc2378da9fa784256ec135069904c4581fbc6"}

[commit-bot: I haz the power, 2016-11-21 19:04:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-21 19:06:31]

Description was changed from

==========
Revert of Only promote opaque scrollers which are stacking contexts. (patchset
#9 id:170001 of https://codereview.chromium.org/2509203002/ )

Reason for revert:
Broke test: svg/as-background-image/svg-width-100p-as-background.html

Original issue's description:
> Only promote opaque scrollers which are stacking contexts.
> 
> Promoting a scroller which is not a stacking context means that any positioned
> descendant must be promoted which will lose LCD text unless it is also opaque.
> 
> BUG=666147
> TEST=PaintLayerScrollableAreaTest.NonContainedLayersNotPromoted
>
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
> 
> Committed: https://crrev.com/9a94cf9be5c058b5007811e9c42aabed46a5d944
> Cr-Commit-Position: refs/heads/master@{#433578}

TBR=schenney@chromium.org,chrishtr@chromium.org,flackr@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=666147
==========

to

==========
Revert of Only promote opaque scrollers which are stacking contexts. (patchset
#9 id:170001 of https://codereview.chromium.org/2509203002/ )

Reason for revert:
Broke test: svg/as-background-image/svg-width-100p-as-background.html

Original issue's description:
> Only promote opaque scrollers which are stacking contexts.
>
> Promoting a scroller which is not a stacking context means that any positioned
> descendant must be promoted which will lose LCD text unless it is also opaque.
>
> BUG=666147
> TEST=PaintLayerScrollableAreaTest.NonContainedLayersNotPromoted
>
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
>
> Committed: https://crrev.com/9a94cf9be5c058b5007811e9c42aabed46a5d944
> Cr-Commit-Position: refs/heads/master@{#433578}

TBR=schenney@chromium.org,chrishtr@chromium.org,flackr@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=666147

Committed: https://crrev.com/0f2de9ef4e82c36545373c679f722a6373686351
Cr-Commit-Position: refs/heads/master@{#433596}
==========

[commit-bot: I haz the power, 2016-11-21 19:06:32]

Patchset 1 (id:??) landed as
https://crrev.com/0f2de9ef4e82c36545373c679f722a6373686351
Cr-Commit-Position: refs/heads/master@{#433596}