Revert of Make GraphicsLayer the DisplayItemClient for scrollbars composited via PaintLayerCompositor.

Revert of Make GraphicsLayer the DisplayItemClient for scrollbars composited via PaintLayerCompositor. (patchset #6 id:100001 of https://codereview.chromium.org/1825193002/ )

Reason for revert:
Speculative revert: this may cause crash for rasterize_and_record_micro benchmark.

BUG=597391
Original issue's description:
> Make GraphicsLayer the DisplayItemClient for scrollbars composited via PaintLayerCompositor.
>
> Currently, the DisplayItemClient is LayoutScrollbarPart. This has two
> problems: the mapping between the LayoutScrollbarPart and its backing
> is hard to reverse-engineer given the way the scrollbar code is set
> up (LayoutScrollbarPart vs Scrollbar vs ScrollableArea), and the
> fact that LayoutScrollbarPart can be painted in both non-composited
> and composited modes. This distinction is important for computation
> of correct visual rects.
>
> This can be cleaned up by replaying the painted scrollbar content
> with the GraphicsLayer backing as the DisplayItemClient, which
> has the correct visualRect() (i.e. bounds of GraphicsLayer).
>
> BUG=529938
>
> Committed: https://crrev.com/8460ef8fc6125185abc1486eb61b0ca7fc9298ad
> Cr-Commit-Position: refs/heads/master@{#382778}

TBR=chrishtr@chromium.org,wkorman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=529938
Committed: https://crrev.com/043ab27b4a422d665580b12b588cba2d47afc387
Cr-Commit-Position: refs/heads/master@{#383451}

[nednguyen, 2016-03-26 04:13:52]

Created Revert of Make GraphicsLayer the DisplayItemClient for scrollbars
composited via PaintLayerCompositor.

[commit-bot: I haz the power, 2016-03-26 07:30:32]

Description was changed from

==========
Revert of Make GraphicsLayer the DisplayItemClient for scrollbars composited via
PaintLayerCompositor. (patchset #6 id:100001 of
https://codereview.chromium.org/1825193002/ )

Reason for revert:
Speculative revert: this may cause crash for rasterize_and_record_micro
benchmark.

BUG=597391

Original issue's description:
> Make GraphicsLayer the DisplayItemClient for scrollbars composited via
PaintLayerCompositor.
> 
> Currently, the DisplayItemClient is LayoutScrollbarPart. This has two
> problems: the mapping between the LayoutScrollbarPart and its backing
> is hard to reverse-engineer given the way the scrollbar code is set
> up (LayoutScrollbarPart vs Scrollbar vs ScrollableArea), and the
> fact that LayoutScrollbarPart can be painted in both non-composited
> and composited modes. This distinction is important for computation
> of correct visual rects.
> 
> This can be cleaned up by replaying the painted scrollbar content
> with the GraphicsLayer backing as the DisplayItemClient, which
> has the correct visualRect() (i.e. bounds of GraphicsLayer).
> 
> BUG=529938
> 
> Committed: https://crrev.com/8460ef8fc6125185abc1486eb61b0ca7fc9298ad
> Cr-Commit-Position: refs/heads/master@{#382778}

TBR=chrishtr@chromium.org,wkorman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=529938
==========

to

==========
Revert of Make GraphicsLayer the DisplayItemClient for scrollbars composited via
PaintLayerCompositor. (patchset #6 id:100001 of
https://codereview.chromium.org/1825193002/ )

Reason for revert:
Speculative revert: this may cause crash for rasterize_and_record_micro
benchmark.

BUG=597391

Original issue's description:
> Make GraphicsLayer the DisplayItemClient for scrollbars composited via
PaintLayerCompositor.
> 
> Currently, the DisplayItemClient is LayoutScrollbarPart. This has two
> problems: the mapping between the LayoutScrollbarPart and its backing
> is hard to reverse-engineer given the way the scrollbar code is set
> up (LayoutScrollbarPart vs Scrollbar vs ScrollableArea), and the
> fact that LayoutScrollbarPart can be painted in both non-composited
> and composited modes. This distinction is important for computation
> of correct visual rects.
> 
> This can be cleaned up by replaying the painted scrollbar content
> with the GraphicsLayer backing as the DisplayItemClient, which
> has the correct visualRect() (i.e. bounds of GraphicsLayer).
> 
> BUG=529938
> 
> Committed: https://crrev.com/8460ef8fc6125185abc1486eb61b0ca7fc9298ad
> Cr-Commit-Position: refs/heads/master@{#382778}

TBR=chrishtr@chromium.org,wkorman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=529938
==========

[commit-bot: I haz the power, 2016-03-26 07:32:01]

Description was changed from

==========
Revert of Make GraphicsLayer the DisplayItemClient for scrollbars composited via
PaintLayerCompositor. (patchset #6 id:100001 of
https://codereview.chromium.org/1825193002/ )

Reason for revert:
Speculative revert: this may cause crash for rasterize_and_record_micro
benchmark.

BUG=597391

Original issue's description:
> Make GraphicsLayer the DisplayItemClient for scrollbars composited via
PaintLayerCompositor.
> 
> Currently, the DisplayItemClient is LayoutScrollbarPart. This has two
> problems: the mapping between the LayoutScrollbarPart and its backing
> is hard to reverse-engineer given the way the scrollbar code is set
> up (LayoutScrollbarPart vs Scrollbar vs ScrollableArea), and the
> fact that LayoutScrollbarPart can be painted in both non-composited
> and composited modes. This distinction is important for computation
> of correct visual rects.
> 
> This can be cleaned up by replaying the painted scrollbar content
> with the GraphicsLayer backing as the DisplayItemClient, which
> has the correct visualRect() (i.e. bounds of GraphicsLayer).
> 
> BUG=529938
> 
> Committed: https://crrev.com/8460ef8fc6125185abc1486eb61b0ca7fc9298ad
> Cr-Commit-Position: refs/heads/master@{#382778}

TBR=chrishtr@chromium.org,wkorman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=529938
==========

to

==========
Revert of Make GraphicsLayer the DisplayItemClient for scrollbars composited via
PaintLayerCompositor. (patchset #6 id:100001 of
https://codereview.chromium.org/1825193002/ )

Reason for revert:
Speculative revert: this may cause crash for rasterize_and_record_micro
benchmark.

BUG=597391

Original issue's description:
> Make GraphicsLayer the DisplayItemClient for scrollbars composited via
PaintLayerCompositor.
>
> Currently, the DisplayItemClient is LayoutScrollbarPart. This has two
> problems: the mapping between the LayoutScrollbarPart and its backing
> is hard to reverse-engineer given the way the scrollbar code is set
> up (LayoutScrollbarPart vs Scrollbar vs ScrollableArea), and the
> fact that LayoutScrollbarPart can be painted in both non-composited
> and composited modes. This distinction is important for computation
> of correct visual rects.
>
> This can be cleaned up by replaying the painted scrollbar content
> with the GraphicsLayer backing as the DisplayItemClient, which
> has the correct visualRect() (i.e. bounds of GraphicsLayer).
>
> BUG=529938
>
> Committed: https://crrev.com/8460ef8fc6125185abc1486eb61b0ca7fc9298ad
> Cr-Commit-Position: refs/heads/master@{#382778}

TBR=chrishtr@chromium.org,wkorman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=529938

Committed: https://crrev.com/043ab27b4a422d665580b12b588cba2d47afc387
Cr-Commit-Position: refs/heads/master@{#383451}
==========