isolate: Move uploadTracker into its own file

isolate: Move uploadTracker into its own file

BUG=692940
Review-Url: https://codereview.chromium.org/2991493002
Committed: https://github.com/luci/luci-go/commit/a5a0dde2bc401c8cdc7b48f646aad3256949ee4f

[mcgreevy, 2017-07-24 05:47:10]

mcgreevy@chromium.org changed reviewers:
+ tansell@chromium.org

[mithro, 2017-07-24 06:19:02]

The CQ bit was checked by tansell@chromium.org

[mithro, 2017-07-24 06:19:02]

lgtm

[commit-bot: I haz the power, 2017-07-24 06:19:09]

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

[commit-bot: I haz the power, 2017-07-24 06:19:11]

This CL has an open dependency (Issue 2983333002 Patch 1). Please resolve the
dependency and try again.
If you are sure that there is no real dependency, please use one of the options
listed in https://goo.gl/9Es4OR to land the CL.

[mcgreevy, 2017-07-26 01:09:54]

The CQ bit was checked by mcgreevy@chromium.org

[commit-bot: I haz the power, 2017-07-26 01:10:05]

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, 2017-07-26 01:16:58]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1501031394452630, "parent_rev":
"36932d3d7c0ea6caae122d88a030bb8e9152ea4b", "commit_rev":
"a5a0dde2bc401c8cdc7b48f646aad3256949ee4f"}

[commit-bot: I haz the power, 2017-07-26 01:17:04]

Description was changed from

==========
isolate: Move uploadTracker into its own file

BUG=692940
==========

to

==========
isolate: Move uploadTracker into its own file

BUG=692940

Review-Url: https://codereview.chromium.org/2991493002
Committed:
https://github.com/luci/luci-go/commit/a5a0dde2bc401c8cdc7b48f646aad3256949ee4f
==========

[commit-bot: I haz the power, 2017-07-26 01:17:05]

Committed patchset #1 (id:1) as
https://github.com/luci/luci-go/commit/a5a0dde2bc401c8cdc7b48f646aad3256949ee4f