Reland of Don't traverse non-stacked layer under composited child in traverseNonCompositingDescendants

Reland of Don't traverse non-stacked layer under composited child in traverseNonCompositingDescendants (patchset #1 id:1 of https://codereview.chromium.org/2219903002/ )

Reason for revert:
Fix conflict.

Original issue's description:
> Revert of Don't traverse non-stacked layer under composited child in traverseNonCompositingDescendants (patchset #5 id:80001 of https://codereview.chromium.org/2214253002/ )
>
> Reason for revert:
> Reverting this CL because it appears to be breaking the following bot: https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac%20Builder%20%28dbg%29/builds/164802
>
> Original issue's description:
> > Don't traverse non-stacked layer under composited child in traverseNonCompositingDescendants
> >
> > Non-stacked layers under a composited object belong to the object, so
> > we should not traverse them in traverseNonCompositingDescendants.
> >
> > BUG=634389
> > TEST=LayoutObjectTest.TraverseNonCompositingDescendantsInPaintOrder
> > TBR=nednguyen (for enabling the system health smoke test)
> >
> > Committed: https://crrev.com/6f716f1637685a30fd65cdec3a6b130690d56dbf
> > Cr-Commit-Position: refs/heads/master@{#410070}
>
> TBR=chrishtr@chromium.org,trchen@chromium.org,wangxianzhu@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=634389
>
> Committed: https://crrev.com/2a98b93fe02a0d09bf32e9ffb96879ba63b08634
> Cr-Commit-Position: refs/heads/master@{#410073}

TBR=chrishtr@chromium.org,trchen@chromium.org,anthonyvd@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=634389
Committed: https://crrev.com/014f83a2957cac7f59d6e3652fb07271bb0e0fe5
Cr-Commit-Position: refs/heads/master@{#410102}

[Xianzhu, 2016-08-05 16:17:21]

Created Reland of Don't traverse non-stacked layer under composited child in
traverseNonCompositingDescendants

[Xianzhu, 2016-08-05 16:30:11]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2016-08-05 17:57:14]

Description was changed from

==========
Reland of Don't traverse non-stacked layer under composited child in
traverseNonCompositingDescendants (patchset #1 id:1 of
https://codereview.chromium.org/2219903002/ )

Reason for revert:
Fix conflict.

Original issue's description:
> Revert of Don't traverse non-stacked layer under composited child in
traverseNonCompositingDescendants (patchset #5 id:80001 of
https://codereview.chromium.org/2214253002/ )
> 
> Reason for revert:
> Reverting this CL because it appears to be breaking the following bot:
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac%20Builder%...
> 
> Original issue's description:
> > Don't traverse non-stacked layer under composited child in
traverseNonCompositingDescendants
> >
> > Non-stacked layers under a composited object belong to the object, so
> > we should not traverse them in traverseNonCompositingDescendants.
> >
> > BUG=634389
> > TEST=LayoutObjectTest.TraverseNonCompositingDescendantsInPaintOrder
> > TBR=nednguyen (for enabling the system health smoke test)
> >
> > Committed: https://crrev.com/6f716f1637685a30fd65cdec3a6b130690d56dbf
> > Cr-Commit-Position: refs/heads/master@{#410070}
> 
> TBR=chrishtr@chromium.org,trchen@chromium.org,wangxianzhu@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=634389
> 
> Committed: https://crrev.com/2a98b93fe02a0d09bf32e9ffb96879ba63b08634
> Cr-Commit-Position: refs/heads/master@{#410073}

TBR=chrishtr@chromium.org,trchen@chromium.org,anthonyvd@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=634389
==========

to

==========
Reland of Don't traverse non-stacked layer under composited child in
traverseNonCompositingDescendants (patchset #1 id:1 of
https://codereview.chromium.org/2219903002/ )

Reason for revert:
Fix conflict.

Original issue's description:
> Revert of Don't traverse non-stacked layer under composited child in
traverseNonCompositingDescendants (patchset #5 id:80001 of
https://codereview.chromium.org/2214253002/ )
>
> Reason for revert:
> Reverting this CL because it appears to be breaking the following bot:
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac%20Builder%...
>
> Original issue's description:
> > Don't traverse non-stacked layer under composited child in
traverseNonCompositingDescendants
> >
> > Non-stacked layers under a composited object belong to the object, so
> > we should not traverse them in traverseNonCompositingDescendants.
> >
> > BUG=634389
> > TEST=LayoutObjectTest.TraverseNonCompositingDescendantsInPaintOrder
> > TBR=nednguyen (for enabling the system health smoke test)
> >
> > Committed: https://crrev.com/6f716f1637685a30fd65cdec3a6b130690d56dbf
> > Cr-Commit-Position: refs/heads/master@{#410070}
>
> TBR=chrishtr@chromium.org,trchen@chromium.org,wangxianzhu@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=634389
>
> Committed: https://crrev.com/2a98b93fe02a0d09bf32e9ffb96879ba63b08634
> Cr-Commit-Position: refs/heads/master@{#410073}

TBR=chrishtr@chromium.org,trchen@chromium.org,anthonyvd@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=634389

Committed: https://crrev.com/014f83a2957cac7f59d6e3652fb07271bb0e0fe5
Cr-Commit-Position: refs/heads/master@{#410102}
==========