[base] Add Decrement and assignment operators to AtomicNumber

[base] Add Decrement and assignment operators to AtomicNumber

AtomicNumber should make dealing with atomic counters easier. This is not the
case with size_t, as we cannot properly use the Increment() method for negative
numbers.

With this CL we can use AtomicNumber<size_t> and have proper decrements.

R=jochen@chromium.org

Committed: https://crrev.com/5e685567ea58d94b033ec67e02bdafa6e45d4544
Cr-Commit-Position: refs/heads/master@{#38407}

[Michael Lippautz, 2016-08-04 10:26:59]

PTAL

Ideally we would at some point switch to using std::atomic ;)

[Michael Lippautz, 2016-08-04 10:27:33]

Description was changed from

==========
[base] Add Decrement and assignment operators to AtomicNumber

AtomicNumber should make dealing with atomic counters easier. This is not the
case with size_t, as we cannot properly use the Increment() method for negative
numbers.

R=jochen@chromium.org
==========

to

==========
[base] Add Decrement and assignment operators to AtomicNumber

AtomicNumber should make dealing with atomic counters easier. This is not the
case with size_t, as we cannot properly use the Increment() method for negative
numbers.

With this CL we can use AtomicNumber<size_t> and have proper decrements.

R=jochen@chromium.org
==========

[Michael Lippautz, 2016-08-04 17:38:39]

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

[commit-bot: I haz the power, 2016-08-04 17:39:11]

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, 2016-08-04 18:06:46]

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

[commit-bot: I haz the power, 2016-08-04 18:06:50]

Dry run: This issue passed the CQ dry run.

[jochen (gone - plz use gerrit), 2016-08-05 11:40:24]

lgtm

[Michael Lippautz, 2016-08-07 18:06:11]

The CQ bit was checked by mlippautz@chromium.org

[commit-bot: I haz the power, 2016-08-07 18:06:15]

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, 2016-08-07 18:29:19]

Description was changed from

==========
[base] Add Decrement and assignment operators to AtomicNumber

AtomicNumber should make dealing with atomic counters easier. This is not the
case with size_t, as we cannot properly use the Increment() method for negative
numbers.

With this CL we can use AtomicNumber<size_t> and have proper decrements.

R=jochen@chromium.org
==========

to

==========
[base] Add Decrement and assignment operators to AtomicNumber

AtomicNumber should make dealing with atomic counters easier. This is not the
case with size_t, as we cannot properly use the Increment() method for negative
numbers.

With this CL we can use AtomicNumber<size_t> and have proper decrements.

R=jochen@chromium.org
==========

[commit-bot: I haz the power, 2016-08-07 18:29:21]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-07 18:31:15]

Description was changed from

==========
[base] Add Decrement and assignment operators to AtomicNumber

AtomicNumber should make dealing with atomic counters easier. This is not the
case with size_t, as we cannot properly use the Increment() method for negative
numbers.

With this CL we can use AtomicNumber<size_t> and have proper decrements.

R=jochen@chromium.org
==========

to

==========
[base] Add Decrement and assignment operators to AtomicNumber

AtomicNumber should make dealing with atomic counters easier. This is not the
case with size_t, as we cannot properly use the Increment() method for negative
numbers.

With this CL we can use AtomicNumber<size_t> and have proper decrements.

R=jochen@chromium.org

Committed: https://crrev.com/5e685567ea58d94b033ec67e02bdafa6e45d4544
Cr-Commit-Position: refs/heads/master@{#38407}
==========

[commit-bot: I haz the power, 2016-08-07 18:31:16]

Patchset 1 (id:??) landed as
https://crrev.com/5e685567ea58d94b033ec67e02bdafa6e45d4544
Cr-Commit-Position: refs/heads/master@{#38407}