[StyleGuide] Allow begin and end non-member functions

[StyleGuide] Allow begin and end non-member functions

Allow usage of |std::begin| and |std::end|. This is useful for iterating
fixed-size arrays.

Discussion thread: https://groups.google.com/a/chromium.org/d/topic/cxx/5iFNE8P5qT4/discussion

Furthermore, this CL replaces home-brewn |std::end|-like functions in
base/trace_event with |std::end| to verify that <iterator> is supported
on all platforms.

Committed: https://crrev.com/b425288a3f4168d1813d7c4db83de3c801cd9365
Cr-Commit-Position: refs/heads/master@{#361192}

[Ruud van Asseldonk, 2015-11-23 10:00:39]

ruuda@google.com changed reviewers:
+ danakj@chromium.org

[Ruud van Asseldonk, 2015-11-23 16:24:52]

ruuda@google.com changed reviewers:
+ thakis@chromium.org

[Nico, 2015-11-23 16:27:51]

lgtm with comment addressed and green try jobs. thanks!

https://codereview.chromium.org/1471683002/diff/1/styleguide/c++/c++11.html
File styleguide/c++/c++11.html (right):

https://codereview.chromium.org/1471683002/diff/1/styleguide/c++/c++11.html#n...
styleguide/c++/c++11.html:309: <td>Useful for fixed-size arrays.</td>
Can you add an <a href> to the discussion thread here too, like the other
entries have?

[danakj, 2015-11-23 18:54:47]

lgtm 2

[Ruud van Asseldonk, 2015-11-23 19:00:15]

The CQ bit was checked by ruuda@google.com

[Ruud van Asseldonk, 2015-11-23 19:00:15]

The patchset sent to the CQ was uploaded after l-g-t-m from thakis@chromium.org
Link to the patchset: https://codereview.chromium.org/1471683002/#ps20001
(title: "Add link to discussion thread")

[commit-bot: I haz the power, 2015-11-23 19:00:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1471683002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1471683002/20001

[commit-bot: I haz the power, 2015-11-23 20:44:02]

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

[commit-bot: I haz the power, 2015-11-23 20:44:03]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Nico, 2015-11-23 20:55:03]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2015-11-23 20:56:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1471683002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1471683002/20001

[commit-bot: I haz the power, 2015-11-23 21:47:10]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-11-23 21:47:52]

Patchset 2 (id:??) landed as
https://crrev.com/b425288a3f4168d1813d7c4db83de3c801cd9365
Cr-Commit-Position: refs/heads/master@{#361192}