ServiceWorker: coalesce all SWClientInfo request into one task.

ServiceWorker: coalesce all SWClientInfo request into one task.

GetClientDocuments is posting on task to the UI thread for every
clients it is currently controlling. This is coalescing the requests
into one task in order to reduce resource usage.

This also gives a better snapshot of the clients state given that
all the information are gathered during the same event loop iteration.

BUG=None

Committed: https://crrev.com/f1bb037074fde50988ca08e9c67e445fd37a8402
Cr-Commit-Position: refs/heads/master@{#319572}

[mlamouri (slow - plz ping), 2015-03-06 17:51:35]

mlamouri@chromium.org changed reviewers:
+ dominicc@chromium.org, michaeln@chromium.org

[michaeln, 2015-03-06 23:54:51]

lgtm, ty! Maybe massage the CL desc to mention another reason too,  by gathering
all client info in one turn of the message loop we get a consistent view at that
moment.

[michaeln, 2015-03-06 23:55:23]

https://codereview.chromium.org/985113002/diff/1/content/browser/service_work...
File content/browser/service_worker/service_worker_version.cc (right):

https://codereview.chromium.org/985113002/diff/1/content/browser/service_work...
content/browser/service_worker/service_worker_version.cc:258: // The tuple
contains process_id, frame_id, client_id.
nice comment

[kinuko, 2015-03-07 04:44:40]

Was just going to make the same change... ty, drive-by lgtm 2

[kinuko, 2015-03-07 04:45:59]

The CQ bit was checked by kinuko@chromium.org

[commit-bot: I haz the power, 2015-03-07 04:46:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/985113002/1

[commit-bot: I haz the power, 2015-03-07 06:46:56]

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

[commit-bot: I haz the power, 2015-03-07 06:46:57]

Try jobs failed on following builders:
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_TIMED_OUT, no build
URL)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_TIMED_OUT, no build URL)
Timed out jobs are not retried to avoid causing additional load on the builders
with large pending queues.

[mlamouri (slow - plz ping), 2015-03-07 14:27:02]

The CQ bit was checked by mlamouri@chromium.org

[commit-bot: I haz the power, 2015-03-07 14:28:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/985113002/1

[mlamouri (slow - plz ping), 2015-03-07 14:31:06]

The CQ bit was unchecked by mlamouri@chromium.org

[mlamouri (slow - plz ping), 2015-03-07 14:32:44]

The CQ bit was checked by mlamouri@chromium.org

[commit-bot: I haz the power, 2015-03-07 14:33:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/985113002/1

[commit-bot: I haz the power, 2015-03-07 16:28:42]

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

[commit-bot: I haz the power, 2015-03-07 16:28:43]

Try jobs failed on following builders:
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_TIMED_OUT, no build
URL)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_TIMED_OUT, no build URL)
Timed out jobs are not retried to avoid causing additional load on the builders
with large pending queues.

[mlamouri (slow - plz ping), 2015-03-07 16:37:23]

The CQ bit was checked by mlamouri@chromium.org

[commit-bot: I haz the power, 2015-03-07 16:39:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/985113002/1

[commit-bot: I haz the power, 2015-03-07 18:39:44]

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

[commit-bot: I haz the power, 2015-03-07 18:39:45]

Try jobs failed on following builders:
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_TIMED_OUT, no build
URL)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_TIMED_OUT, no build URL)
Timed out jobs are not retried to avoid causing additional load on the builders
with large pending queues.

[mlamouri (slow - plz ping), 2015-03-07 18:40:28]

The CQ bit was checked by mlamouri@chromium.org

[commit-bot: I haz the power, 2015-03-07 18:41:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/985113002/1

[commit-bot: I haz the power, 2015-03-07 20:42:03]

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

[commit-bot: I haz the power, 2015-03-07 20:42:04]

Try jobs failed on following builders:
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_TIMED_OUT, no build
URL)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_TIMED_OUT, no build URL)
Timed out jobs are not retried to avoid causing additional load on the builders
with large pending queues.

[mlamouri (slow - plz ping), 2015-03-07 23:59:08]

The CQ bit was checked by mlamouri@chromium.org

[commit-bot: I haz the power, 2015-03-08 00:00:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/985113002/1

[commit-bot: I haz the power, 2015-03-08 03:53:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-08 03:54:07]

Patchset 1 (id:??) landed as
https://crrev.com/f1bb037074fde50988ca08e9c67e445fd37a8402
Cr-Commit-Position: refs/heads/master@{#319572}