[Reland] Add a new app API to enable watchdog behavior restarts in kiosk apps

[Reland] Add a new app API to enable watchdog behavior restarts in kiosk apps

Original CL: https://codereview.chromium.org/1970613003/

This CL adds chrome.runtime.restartAfterDelay(int seconds, callback) to enable
watchdog behavior restarts in kiosk apps.

TBR=xiyuan@chromium.org,rdevlin.cronin@chromium.org,benwells@chromium.org,mpearson@chromium.org,pam@chromium.org
BUG=604578
TEST=extensions_unittests --gtest_filter=RestartAfterDelayApiTest.*

Committed: https://crrev.com/2bd481835dcc7d0af338de28de9b91f136683cbf
Cr-Commit-Position: refs/heads/master@{#400166}

[afakhry, 2016-06-16 13:36:42]

Relanding after it was reverted due to a flaky test:

RestartAfterDelayApiTest.RestartAfterDelayTest:
c:\b\build\slave\drm-cr\build\src\extensions\browser\api\runtime\restart_after_delay_api_unittest.cc(230):
error: The difference between (desired_restart_time() -
last_restart_time).InSecondsF() and base::TimeDelta::FromSeconds(2).InSecondsF()
is 0.025495000000000045, which exceeds 0.01, where
(desired_restart_time() - last_restart_time).InSecondsF() evaluates to 1.974505,
base::TimeDelta::FromSeconds(2).InSecondsF() evaluates to 2, and
0.01 evaluates to 0.01.

Increased the allowed floating point difference error to 0.5 instead of 0.01 to
avoid flakiness.

[afakhry, 2016-06-16 16:10:43]

The CQ bit was checked by afakhry@chromium.org

[commit-bot: I haz the power, 2016-06-16 16:11:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2069923006/20001

[commit-bot: I haz the power, 2016-06-16 16:17:41]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-06-16 16:20:39]

Description was changed from

==========
[Reland] Add a new app API to enable watchdog behavior restarts in kiosk apps

Original CL: https://codereview.chromium.org/1970613003/

This CL adds chrome.runtime.restartAfterDelay(int seconds, callback) to enable
watchdog behavior restarts in kiosk apps.

TBR=xiyuan@chromium.org,rdevlin.cronin@chromium.org,benwells@chromium.org,mpe...
BUG=604578
TEST=browser_tests --gtest_filter=RestartAfterDelayApiTest.RestartAfterDelayTest
==========

to

==========
[Reland] Add a new app API to enable watchdog behavior restarts in kiosk apps

Original CL: https://codereview.chromium.org/1970613003/

This CL adds chrome.runtime.restartAfterDelay(int seconds, callback) to enable
watchdog behavior restarts in kiosk apps.

TBR=xiyuan@chromium.org,rdevlin.cronin@chromium.org,benwells@chromium.org,mpe...
BUG=604578
TEST=browser_tests --gtest_filter=RestartAfterDelayApiTest.RestartAfterDelayTest

Committed: https://crrev.com/2bd481835dcc7d0af338de28de9b91f136683cbf
Cr-Commit-Position: refs/heads/master@{#400166}
==========

[commit-bot: I haz the power, 2016-06-16 16:20:40]

Patchset 2 (id:??) landed as
https://crrev.com/2bd481835dcc7d0af338de28de9b91f136683cbf
Cr-Commit-Position: refs/heads/master@{#400166}

[afakhry, 2016-06-16 16:55:55]

Description was changed from

==========
[Reland] Add a new app API to enable watchdog behavior restarts in kiosk apps

Original CL: https://codereview.chromium.org/1970613003/

This CL adds chrome.runtime.restartAfterDelay(int seconds, callback) to enable
watchdog behavior restarts in kiosk apps.

TBR=xiyuan@chromium.org,rdevlin.cronin@chromium.org,benwells@chromium.org,mpe...
BUG=604578
TEST=browser_tests --gtest_filter=RestartAfterDelayApiTest.RestartAfterDelayTest

Committed: https://crrev.com/2bd481835dcc7d0af338de28de9b91f136683cbf
Cr-Commit-Position: refs/heads/master@{#400166}
==========

to

==========
[Reland] Add a new app API to enable watchdog behavior restarts in kiosk apps

Original CL: https://codereview.chromium.org/1970613003/

This CL adds chrome.runtime.restartAfterDelay(int seconds, callback) to enable
watchdog behavior restarts in kiosk apps.

TBR=xiyuan@chromium.org,rdevlin.cronin@chromium.org,benwells@chromium.org,mpe...
BUG=604578
TEST=extensions_unittests --gtest_filter=RestartAfterDelayApiTest.*

Committed: https://crrev.com/2bd481835dcc7d0af338de28de9b91f136683cbf
Cr-Commit-Position: refs/heads/master@{#400166}
==========