Fix CPU profiler deadlock on Windows + AMD CPU.

Fix CPU profiler deadlock on Windows + AMD CPU.

Implement a lock free version of RolloverProtectedTickClock::Now
to eliminate a deadlock.

BUG=chromium:521420
LOG=Y

Committed: https://crrev.com/d6db8e5902af1f067f0f149844f4e92824ee93f3
Cr-Commit-Position: refs/heads/master@{#30489}

Committed: https://crrev.com/6184f1fef6692db2e89cacd380013a4a1bf7e8b1
Cr-Commit-Position: refs/heads/master@{#30522}

[alph, 2015-08-31 22:42:26]

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

[commit-bot: I haz the power, 2015-08-31 22:42:40]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1304873011/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1304873011/1

[alph, 2015-08-31 23:10:39]

alph@chromium.org changed reviewers:
+ caseq@chromium.org, yurys@chromium.org

[commit-bot: I haz the power, 2015-08-31 23:13:05]

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

[commit-bot: I haz the power, 2015-08-31 23:13:06]

Dry run: This issue passed the CQ dry run.

[yurys, 2015-08-31 23:28:23]

lgtm

[alph, 2015-08-31 23:33:22]

alph@chromium.org changed reviewers:
+ bmeurer@chromium.org

[alph, 2015-08-31 23:33:22]

Benedikt, could you please take a look.

[Benedikt Meurer, 2015-09-01 03:16:30]

LGTM.

[alph, 2015-09-01 04:01:16]

The CQ bit was checked by alph@chromium.org

[commit-bot: I haz the power, 2015-09-01 04:01:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1304873011/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1304873011/1

[commit-bot: I haz the power, 2015-09-01 04:02:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-01 04:02:54]

Patchset 1 (id:??) landed as
https://crrev.com/d6db8e5902af1f067f0f149844f4e92824ee93f3
Cr-Commit-Position: refs/heads/master@{#30489}

[alph, 2015-09-01 04:10:43]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1303423006/ by alph@chromium.org.

The reason for reverting is: Broke a test.

[alph, 2015-09-01 17:33:10]

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

[commit-bot: I haz the power, 2015-09-01 17:33:20]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1304873011/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1304873011/20001

[commit-bot: I haz the power, 2015-09-01 18:29:19]

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

[commit-bot: I haz the power, 2015-09-01 18:29:20]

Dry run: This issue passed the CQ dry run.

[alph, 2015-09-01 18:30:47]

The CQ bit was checked by alph@chromium.org

[alph, 2015-09-01 18:30:48]

The patchset sent to the CQ was uploaded after l-g-t-m from
bmeurer@chromium.org, yurys@chromium.org
Link to the patchset: https://codereview.chromium.org/1304873011/#ps20001
(title: "use unsigned types")

[commit-bot: I haz the power, 2015-09-01 18:30:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1304873011/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1304873011/20001

[commit-bot: I haz the power, 2015-09-01 18:32:45]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-01 18:32:58]

Patchset 2 (id:??) landed as
https://crrev.com/6184f1fef6692db2e89cacd380013a4a1bf7e8b1
Cr-Commit-Position: refs/heads/master@{#30522}