[RELAND] Fixit: Factor out common base::Time* math operator overloads.

[RELAND] Fixit: Factor out common base::Time* math operator overloads.

This relands https://codereview.chromium.org/1122443004 with a landmine
to clobber the iOS builds.  This is necessary because Xcode's logic for
determining that base/time/time.h changed is faulty and is preventing
modules dependent on it from being rebuilt.

Revert history: https://codereview.chromium.org/1125283003

BUG=467417, 485435
TBR=stuartmorgan@chromium.org

Committed: https://crrev.com/ad576e7a77b87bfd0ed09b46cf9fdfacd342672b
Cr-Commit-Position: refs/heads/master@{#329060}

[miu, 2015-05-08 20:49:46]

miu@chromium.org changed reviewers:
+ stuartmorgan@chromium.org, thakis@chromium.org

[miu, 2015-05-08 20:49:47]

stuartmorgan and thakis: PTAL at build/get_landmines.py.

History on why the landmine is needed (to clobber the iOS build) can be found in
https://crbug.com/485435.

[Lei Zhang, 2015-05-08 20:51:50]

base/ lgtm since it's unchanged.

[Nico, 2015-05-08 20:55:41]

lgtm

https://codereview.chromium.org/1131923005/diff/1/build/get_landmines.py
File build/get_landmines.py (right):

https://codereview.chromium.org/1131923005/diff/1/build/get_landmines.py#newc...
build/get_landmines.py:72: if (platform() == 'ios'):
remove parens

[miu, 2015-05-08 21:09:40]

https://codereview.chromium.org/1131923005/diff/1/build/get_landmines.py
File build/get_landmines.py (right):

https://codereview.chromium.org/1131923005/diff/1/build/get_landmines.py#newc...
build/get_landmines.py:72: if (platform() == 'ios'):
On 2015/05/08 20:55:41, Nico wrote:
> remove parens

Done.

[miu, 2015-05-09 01:47:43]

Re-reading the discussion in the bug, it looks like the problem is pretty well
understood.  Therefore, I'm proceeding with committing this w/ the clobber.

[miu, 2015-05-09 01:47:50]

The CQ bit was checked by miu@chromium.org

[miu, 2015-05-09 01:47:51]

The patchset sent to the CQ was uploaded after l-g-t-m from
thestig@chromium.org, thakis@chromium.org
Link to the patchset: https://codereview.chromium.org/1131923005/#ps20001
(title: "Removed parens because Python.")

[commit-bot: I haz the power, 2015-05-09 01:48:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1131923005/20001

[commit-bot: I haz the power, 2015-05-09 06:04:01]

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

[commit-bot: I haz the power, 2015-05-09 06:04:03]

Try jobs failed on following builders:
  android_chromium_gn_compile_dbg on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  android_chromium_gn_compile_rel on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  cast_shell_android on tryserver.chromium.linux (JOB_TIMED_OUT, no build URL)
  cast_shell_linux on tryserver.chromium.linux (JOB_TIMED_OUT, no build URL)
  chromium_presubmit on tryserver.chromium.linux (JOB_TIMED_OUT, no build URL)
  linux_chromium_asan_rel_ng on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  linux_chromium_chromeos_compile_dbg_ng on tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  linux_chromium_chromeos_ozone_rel_ng on tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  linux_chromium_clobber_rel_ng on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  linux_chromium_gn_chromeos_rel on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  linux_chromium_gn_dbg on tryserver.chromium.linux (JOB_TIMED_OUT, no build
URL)
  linux_chromium_gn_rel on tryserver.chromium.linux (JOB_TIMED_OUT, no build
URL)
  linux_chromium_rel_ng on tryserver.chromium.linux (JOB_TIMED_OUT, no build
URL)
  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)
  win_chromium_compile_dbg_ng on tryserver.chromium.win (JOB_TIMED_OUT, no build
URL)
  win_chromium_rel_ng on tryserver.chromium.win (JOB_TIMED_OUT, no build URL)
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_TIMED_OUT, no build
URL)

[Lei Zhang, 2015-05-09 09:32:08]

The CQ bit was checked by thestig@chromium.org

[commit-bot: I haz the power, 2015-05-09 09:36:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1131923005/20001

[commit-bot: I haz the power, 2015-05-09 13:41:03]

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

[commit-bot: I haz the power, 2015-05-09 13:41:04]

Try jobs failed on following builders:
  android_chromium_gn_compile_dbg on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  android_chromium_gn_compile_rel on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  cast_shell_android on tryserver.chromium.linux (JOB_TIMED_OUT, no build URL)
  cast_shell_linux on tryserver.chromium.linux (JOB_TIMED_OUT, no build URL)
  chromium_presubmit on tryserver.chromium.linux (JOB_TIMED_OUT, no build URL)
  linux_chromium_asan_rel_ng on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  linux_chromium_chromeos_compile_dbg_ng on tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  linux_chromium_chromeos_ozone_rel_ng on tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  linux_chromium_clobber_rel_ng on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  linux_chromium_gn_chromeos_rel on tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  linux_chromium_gn_dbg on tryserver.chromium.linux (JOB_TIMED_OUT, no build
URL)
  linux_chromium_gn_rel on tryserver.chromium.linux (JOB_TIMED_OUT, no build
URL)
  linux_chromium_rel_ng on tryserver.chromium.linux (JOB_TIMED_OUT, no build
URL)

[miu, 2015-05-09 18:57:08]

The CQ bit was checked by miu@chromium.org

[commit-bot: I haz the power, 2015-05-09 18:59:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1131923005/20001

[commit-bot: I haz the power, 2015-05-10 00:15:31]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-10 00:16:36]

Patchset 2 (id:??) landed as
https://crrev.com/ad576e7a77b87bfd0ed09b46cf9fdfacd342672b
Cr-Commit-Position: refs/heads/master@{#329060}