Eagerly invalidate when a layer becomes stacking context

Eagerly invalidate when a layer becomes stacking context

When an object begin or cease to be a stacking context, the paint
invalidation container of the object and/or descendants may change.
We need to invalidate paint eagerly for all such children.
PaintLayerCompositor::paintInvalidationOnCompositingChange() doesn't
work for the case because it can only see the new
paintInvalidationContainer.

Previously we handled the case of ceasing to be stacking context only.

BUG=688647
TEST=paint/invalidation/compositing/new-stacking-context.html
TBR=wangxianzhu@chromium.org
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2738303002
Cr-Original-Commit-Position: refs/heads/master@{#456277}
Review-Url: https://codereview.chromium.org/2747143004
Cr-Commit-Position: refs/branch-heads/3029@{#186}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/b6d4dbd30650860f7cd2110626337ee041e7e7aa

[Xianzhu, 2017-03-14 16:16:01]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2017-03-14 16:16:43]

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, 2017-03-14 16:19:51]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1489508161746970, "parent_rev":
"0bca295bdd893a0217dd4ac32e61eccc08c83ab2", "commit_rev":
"b6d4dbd30650860f7cd2110626337ee041e7e7aa"}

[commit-bot: I haz the power, 2017-03-14 16:20:34]

Description was changed from

==========
Eagerly invalidate when a layer becomes stacking context

When an object begin or cease to be a stacking context, the paint
invalidation container of the object and/or descendants may change.
We need to invalidate paint eagerly for all such children.
PaintLayerCompositor::paintInvalidationOnCompositingChange() doesn't
work for the case because it can only see the new
paintInvalidationContainer.

Previously we handled the case of ceasing to be stacking context only.

BUG=688647
TEST=paint/invalidation/compositing/new-stacking-context.html
TBR=wangxianzhu@chromium.org
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2738303002
Cr-Commit-Position: refs/heads/master@{#456277}
==========

to

==========
Eagerly invalidate when a layer becomes stacking context

When an object begin or cease to be a stacking context, the paint
invalidation container of the object and/or descendants may change.
We need to invalidate paint eagerly for all such children.
PaintLayerCompositor::paintInvalidationOnCompositingChange() doesn't
work for the case because it can only see the new
paintInvalidationContainer.

Previously we handled the case of ceasing to be stacking context only.

BUG=688647
TEST=paint/invalidation/compositing/new-stacking-context.html
TBR=wangxianzhu@chromium.org
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2738303002
Cr-Original-Commit-Position: refs/heads/master@{#456277}
Review-Url: https://codereview.chromium.org/2747143004
Cr-Commit-Position: refs/branch-heads/3029@{#186}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/b6d4dbd30650860f7cd211062633...
==========

[commit-bot: I haz the power, 2017-03-14 16:20:38]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/b6d4dbd30650860f7cd211062633...