Implement Internals::mainThreadScrollingReasons for SPV2

Implement Internals::mainThreadScrollingReasons for SPV2

This patch returns FrameView's main thread scrolling reasons
as a string which is used by Internals::mainThreadScrollingReasons.

TEST=compositing/layer-creation/iframe-background-attachment-fixed.html with
--additional-driver-flag=--enable-slimming-paint-v2

BUG=671838
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2634493006
Cr-Commit-Position: refs/heads/master@{#443744}
Committed: https://chromium.googlesource.com/chromium/src/+/9bf0adfb29b2f4c92c658a31d5562cded817746b

[pdr., 2017-01-13 22:02:57]

pdr@chromium.org changed reviewers:
+ chrishtr@chromium.org, yigu@chromium.org

[pdr., 2017-01-13 22:03:01]

The CQ bit was checked by pdr@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-01-13 22:03:42]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[pdr., 2017-01-13 22:53:54]

Description was changed from

==========
Implement Internals::mainThreadScrollingReasons for SPV2

This patch returns FrameView's main thread scrolling reasons
as a string which is used by Internals::mainThreadScrollingReasons.

TEST=compositing/layer-creation/iframe-background-attachment-fixed.html with
--additional-driver-flag=--enable-slimming-paint-v2

BUG=671838
==========

to

==========
Implement Internals::mainThreadScrollingReasons for SPV2

This patch returns FrameView's main thread scrolling reasons
as a string which is used by Internals::mainThreadScrollingReasons.

TEST=compositing/layer-creation/iframe-background-attachment-fixed.html with
--additional-driver-flag=--enable-slimming-paint-v2

BUG=671838

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
==========

[pdr., 2017-01-13 23:00:49]

The CQ bit was unchecked by pdr@chromium.org

[pdr., 2017-01-13 23:00:55]

The CQ bit was checked by pdr@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-01-13 23:01:04]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[chrishtr, 2017-01-14 00:36:52]

lgtm

[commit-bot: I haz the power, 2017-01-14 00:36:57]

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

[commit-bot: I haz the power, 2017-01-14 00:36:57]

Dry run: This issue passed the CQ dry run.

[pdr., 2017-01-14 00:37:51]

The CQ bit was checked by pdr@chromium.org

[commit-bot: I haz the power, 2017-01-14 00:38:26]

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, 2017-01-14 00:50:36]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484354271190580, "parent_rev":
"013d385f0e25567c5f91eb440e5d5c092e1bb0e1", "commit_rev":
"9bf0adfb29b2f4c92c658a31d5562cded817746b"}

[commit-bot: I haz the power, 2017-01-14 00:51:11]

Description was changed from

==========
Implement Internals::mainThreadScrollingReasons for SPV2

This patch returns FrameView's main thread scrolling reasons
as a string which is used by Internals::mainThreadScrollingReasons.

TEST=compositing/layer-creation/iframe-background-attachment-fixed.html with
--additional-driver-flag=--enable-slimming-paint-v2

BUG=671838

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
==========

to

==========
Implement Internals::mainThreadScrollingReasons for SPV2

This patch returns FrameView's main thread scrolling reasons
as a string which is used by Internals::mainThreadScrollingReasons.

TEST=compositing/layer-creation/iframe-background-attachment-fixed.html with
--additional-driver-flag=--enable-slimming-paint-v2

BUG=671838

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2634493006
Cr-Commit-Position: refs/heads/master@{#443744}
Committed:
https://chromium.googlesource.com/chromium/src/+/9bf0adfb29b2f4c92c658a31d556...
==========

[commit-bot: I haz the power, 2017-01-14 00:51:12]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/9bf0adfb29b2f4c92c658a31d556...