Fix issue when background changes painting target layer

Fix issue when background changes painting target layer

BUG=672149
TEST=paint/invalidation/compositing/stop-painting-onto-scrolling-contents.html
NOTRY=true
NOPRESUBMIT=true
TBR=wangxianzhu@chromium.org

Review-Url: https://codereview.chromium.org/2559863002
Cr-Commit-Position: refs/heads/master@{#437296}
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

[Xianzhu, 2016-12-09 19:11:11]

Description was changed from

==========
Fix issue when background changes painting target layer

BUG=672149
TEST=paint/invalidation/compositing/stop-painting-onto-scrolling-contents.html
NOTRY=true
NOPRESUBMIT=true
TBR=wangxianzhu@chromium.org

Review-Url: https://codereview.chromium.org/2559863002
Cr-Commit-Position: refs/heads/master@{#437296}
==========

to

==========
Fix issue when background changes painting target layer

BUG=672149
TEST=paint/invalidation/compositing/stop-painting-onto-scrolling-contents.html
NOTRY=true
NOPRESUBMIT=true
TBR=wangxianzhu@chromium.org

Review-Url: https://codereview.chromium.org/2559863002
Cr-Commit-Position: refs/heads/master@{#437296}
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
==========

[Xianzhu, 2016-12-09 19:11:12]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2016-12-09 19:11:57]

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, 2016-12-09 19:19:34]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481310672183820, "parent_rev":
"df42ce138cd8547c7a2c2cf04f459125cffb79e2", "commit_rev":
"130094d2f82460ec05353a18416c8d0dee465dce"}

[commit-bot: I haz the power, 2016-12-09 19:22:07]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481310672183820, "parent_rev":
"df42ce138cd8547c7a2c2cf04f459125cffb79e2", "commit_rev":
"99a3f51d14dbf106ef04ef9a27b04590d7e5662d"}

[commit-bot: I haz the power, 2016-12-09 19:24:40]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481310672183820, "parent_rev":
"df42ce138cd8547c7a2c2cf04f459125cffb79e2", "commit_rev":
"00adf0f19709fa1d42107918d85f9dd912120a6f"}

[commit-bot: I haz the power, 2016-12-09 19:27:18]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-12-09 19:27:22]

Failed to commit the patch.

[Xianzhu, 2016-12-09 19:33:16]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2016-12-09 19:33:57]

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, 2016-12-09 19:36:44]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481311996088010, "parent_rev":
"8aa0a71be8e896e07fe08285301267d6baae0c55", "commit_rev":
"b256a37651307d7a2f55f5e59c38f10944e59be2"}

[commit-bot: I haz the power, 2016-12-09 19:39:18]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481311996088010, "parent_rev":
"8aa0a71be8e896e07fe08285301267d6baae0c55", "commit_rev":
"6c33deea59e548bc8222bc2eefbabd705e3c34c1"}

[commit-bot: I haz the power, 2016-12-09 19:41:48]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481311996088010, "parent_rev":
"8aa0a71be8e896e07fe08285301267d6baae0c55", "commit_rev":
"cc2ce6c07fb64194c5818ff6176d1491a536f658"}

[commit-bot: I haz the power, 2016-12-09 19:44:39]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-12-09 19:44:40]

Failed to commit the patch.

[Xianzhu, 2016-12-09 19:50:02]

Committed patchset #1 (id:1) to pending queue manually as
1e0d74f84ecc247abe8c9bb5667140902ae64f38 (presubmit successful).