Regression test for disappearing drag source while drag is in progress.

Regression test for disappearing drag source while drag is in progress.

BUG=670123
Review-Url: https://codereview.chromium.org/2668583002
Cr-Commit-Position: refs/heads/master@{#447268}
Committed: https://chromium.googlesource.com/chromium/src/+/eaa967e836eb9669db7a666f69c3811e066e2739

[Łukasz Anforowicz, 2017-01-31 00:15:00]

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

[commit-bot: I haz the power, 2017-01-31 00:15:48]

Dry run: 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, 2017-01-31 00:57:28]

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

[commit-bot: I haz the power, 2017-01-31 00:57:29]

Dry run: This issue passed the CQ dry run.

[Łukasz Anforowicz, 2017-01-31 01:05:34]

lukasza@chromium.org changed reviewers:
+ lfg@chromium.org

[Łukasz Anforowicz, 2017-01-31 01:05:35]

lfg@, could you PTAL?

As I said in the bug - when testing this CL locally everything seems to work as
expected: the test passes at ToT, but crashes with the expected callstack after
reverting r435758.  I've also tried running locally with --site-per-process and
everything passed as expected (the linux_site_isolation tryjob is still running,
because I forgot to include in the dry run earlier... :-/ ).

[lfg, 2017-01-31 15:59:18]

+paulmeyer FYI

lgtm

[Łukasz Anforowicz, 2017-01-31 17:56:44]

The CQ bit was checked by lukasza@chromium.org

[commit-bot: I haz the power, 2017-01-31 17:57:16]

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, 2017-01-31 18:01:36]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1485885404719980, "parent_rev":
"8d4da8a74f81f9cd097a12d4a77e5c8839a0d958", "commit_rev":
"eaa967e836eb9669db7a666f69c3811e066e2739"}

[commit-bot: I haz the power, 2017-01-31 18:02:54]

Description was changed from

==========
Regression test for disappearing drag source while drag is in progress.

BUG=670123
==========

to

==========
Regression test for disappearing drag source while drag is in progress.

BUG=670123

Review-Url: https://codereview.chromium.org/2668583002
Cr-Commit-Position: refs/heads/master@{#447268}
Committed:
https://chromium.googlesource.com/chromium/src/+/eaa967e836eb9669db7a666f69c3...
==========

[commit-bot: I haz the power, 2017-01-31 18:02:56]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/eaa967e836eb9669db7a666f69c3...