Add logging for prefetch tablist task.

Add logging for prefetch tablist task.

Also clean-up for unnecessary context parameters.

BUG=649729
Committed: https://crrev.com/e9d894c77a305b224e252637c2c2c05f3275c17d
Cr-Commit-Position: refs/heads/master@{#421273}

[Peter Wen, 2016-09-26 20:07:25]

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

[commit-bot: I haz the power, 2016-09-26 20:08:11]

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

[Peter Wen, 2016-09-26 20:32:02]

wnwen@chromium.org changed reviewers:
+ twellington@chromium.org

[Peter Wen, 2016-09-26 20:32:03]

🚢

[Theresa, 2016-09-26 20:53:49]

lgtm

[commit-bot: I haz the power, 2016-09-26 21:39:34]

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

[commit-bot: I haz the power, 2016-09-26 21:39:35]

Dry run: This issue passed the CQ dry run.

[Theresa, 2016-09-26 23:42:50]

While you're in here making changes, will you please add a logging statement at
the beginning of the async prefetch tab list task as well as at the beginning of
the multi-instance migration task, so that we know the ordering in which these
occur. Thank you!

[Peter Wen, 2016-09-27 13:13:49]

wnwen@chromium.org changed reviewers:
+ dfalcantara@chromium.org

[Peter Wen, 2016-09-27 13:13:50]

Added Log.w so we have more debug information.

+dfalcantara for *tabmodel/ OWNERS when he gets back.

[gone, 2016-09-27 17:27:37]

lgtm

[Peter Wen, 2016-09-27 17:39:33]

The CQ bit was checked by wnwen@chromium.org

[Peter Wen, 2016-09-27 17:39:34]

The patchset sent to the CQ was uploaded after l-g-t-m from
twellington@chromium.org
Link to the patchset: https://chromiumcodereview.appspot.com/2374523002/#ps20001
(title: "Add logging.")

[commit-bot: I haz the power, 2016-09-27 17:40:05]

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, 2016-09-27 18:22:37]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-09-27 18:33:52]

Description was changed from

==========
Add logging for prefetch tablist task.

Also clean-up for unnecessary context parameters.

BUG=649729
==========

to

==========
Add logging for prefetch tablist task.

Also clean-up for unnecessary context parameters.

BUG=649729

Committed: https://crrev.com/e9d894c77a305b224e252637c2c2c05f3275c17d
Cr-Commit-Position: refs/heads/master@{#421273}
==========

[commit-bot: I haz the power, 2016-09-27 18:33:53]

Patchset 2 (id:??) landed as
https://crrev.com/e9d894c77a305b224e252637c2c2c05f3275c17d
Cr-Commit-Position: refs/heads/master@{#421273}