Revert of [scheduler] Change TaskQueue observer call mechanism.

Revert of [scheduler] Change TaskQueue observer call mechanism. (patchset #6 id:100001 of https://codereview.chromium.org/2808843003/ )

Reason for revert:
This looks causing failure of loading pages when launching the process. For example, twitter lite cannot be open from the home screen because the hosting service worker probably cannot run on a process. 

See also https://crbug.com/725337.

Original issue's description:
> [scheduler] Change TaskQueue observer call mechanism.
> 
> Instead of manually calling TaskQueue observer we can rely on TimeDomain
> calling SetScheduledTimeDomainWakeUp and we can call the observer from
> there.
> 
> This patch also fixes the problem where pages were stuck due to a missing
> notification. Test coverage is improved and HasPendingImmediateWork renamed
> to HasTaskToRunImmediately to better reflect its meaning.
> 
> R=alexclarke@chromium.org,skyostil@chromium.org
> BUG=699541, 710095
> 
> Review-Url: https://codereview.chromium.org/2808843003
> Cr-Commit-Position: refs/heads/master@{#470957}
> Committed: https://chromium.googlesource.com/chromium/src/+/0f67a0c1b7f0e461114771b4297f5fc0a0202cee

TBR=alexclarke@chromium.org,skyostil@chromium.org,altimin@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=699541, 710095

[shimazu, 2017-06-01 03:35:12]

The CQ bit was checked by shimazu@chromium.org

[shimazu, 2017-06-01 03:35:12]

Created Revert of [scheduler] Change TaskQueue observer call mechanism.

[commit-bot: I haz the power, 2017-06-01 03:35:32]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[shimazu, 2017-06-01 03:54:36]

The CQ bit was unchecked by shimazu@chromium.org

[shimazu, 2017-06-01 04:22:32]

I found ToT chromium without this revert commit also works well locally while
canary doesn't work. This might not be related to the issue.
Let me stop to send this to CQ for now. Sorry for confusing.

[shimazu, 2017-06-01 07:10:21]

Description was changed from

==========
Revert of [scheduler] Change TaskQueue observer call mechanism. (patchset #6
id:100001 of https://codereview.chromium.org/2808843003/ )

Reason for revert:
This looks causing failure of loading pages when launching the process. For
example, twitter lite cannot be open from the home screen because the hosting
service worker probably cannot run on a process. 

See also https://crbug.com/725337.

Original issue's description:
> [scheduler] Change TaskQueue observer call mechanism.
> 
> Instead of manually calling TaskQueue observer we can rely on TimeDomain
> calling SetScheduledTimeDomainWakeUp and we can call the observer from
> there.
> 
> This patch also fixes the problem where pages were stuck due to a missing
> notification. Test coverage is improved and HasPendingImmediateWork renamed
> to HasTaskToRunImmediately to better reflect its meaning.
> 
> R=alexclarke@chromium.org,skyostil@chromium.org
> BUG=699541,710095
> 
> Review-Url: https://codereview.chromium.org/2808843003
> Cr-Commit-Position: refs/heads/master@{#470957}
> Committed:
https://chromium.googlesource.com/chromium/src/+/0f67a0c1b7f0e461114771b4297f...

TBR=alexclarke@chromium.org,skyostil@chromium.org,altimin@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=699541,710095
==========

to

==========
Revert of [scheduler] Change TaskQueue observer call mechanism. (patchset #6
id:100001 of https://codereview.chromium.org/2808843003/ )

Reason for revert:
This looks causing failure of loading pages when launching the process. For
example, twitter lite cannot be open from the home screen because the hosting
service worker probably cannot run on a process. 

See also https://crbug.com/725337.

Original issue's description:
> [scheduler] Change TaskQueue observer call mechanism.
> 
> Instead of manually calling TaskQueue observer we can rely on TimeDomain
> calling SetScheduledTimeDomainWakeUp and we can call the observer from
> there.
> 
> This patch also fixes the problem where pages were stuck due to a missing
> notification. Test coverage is improved and HasPendingImmediateWork renamed
> to HasTaskToRunImmediately to better reflect its meaning.
> 
> R=alexclarke@chromium.org,skyostil@chromium.org
> BUG=699541,710095
> 
> Review-Url: https://codereview.chromium.org/2808843003
> Cr-Commit-Position: refs/heads/master@{#470957}
> Committed:
https://chromium.googlesource.com/chromium/src/+/0f67a0c1b7f0e461114771b4297f...

TBR=alexclarke@chromium.org,skyostil@chromium.org,altimin@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=699541,710095
==========