GN: Add common header extensions

GN: Add common header extensions

GN now recognizes most common header file extensions:
*.h, *.hh, *.hpp, *.hxx

These are all used inside the chromium repository.
This change makes "gn check" more robust.

R=brettw@chromium.org
BUG=

Committed: https://crrev.com/cc00b4093699e76fb09489ede68c1eb3fb4b0db7
Cr-Commit-Position: refs/heads/master@{#391056}

[brettw, 2016-05-02 17:05:13]

lgtm

[NGG, 2016-05-02 20:34:11]

The CQ bit was checked by ngg@ngg.hu

[commit-bot: I haz the power, 2016-05-02 20:34:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1933323002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1933323002/1

[commit-bot: I haz the power, 2016-05-02 21:25:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-02 21:27:28]

Description was changed from

==========
GN: Add common header extensions

GN now recognizes most common header file extensions:
*.h, *.hh, *.hpp, *.hxx

These are all used inside the chromium repository.
This change makes "gn check" more robust.

R=brettw@chromium.org
BUG=
==========

to

==========
GN: Add common header extensions

GN now recognizes most common header file extensions:
*.h, *.hh, *.hpp, *.hxx

These are all used inside the chromium repository.
This change makes "gn check" more robust.

R=brettw@chromium.org
BUG=

Committed: https://crrev.com/cc00b4093699e76fb09489ede68c1eb3fb4b0db7
Cr-Commit-Position: refs/heads/master@{#391056}
==========

[commit-bot: I haz the power, 2016-05-02 21:27:29]

Patchset 1 (id:??) landed as
https://crrev.com/cc00b4093699e76fb09489ede68c1eb3fb4b0db7
Cr-Commit-Position: refs/heads/master@{#391056}