check-webkit-style should allow "bool a : 1"

check-webkit-style should allow "bool a : 1"
https://bugs.webkit.org/show_bug.cgi?id=142794

Reviewed by Brent Fulgham.

We should allow member bitfields of the form:

bool m_var : 1;

It seems that Visual Studio 8 was the last compiler that
wasn't happy about not using unsigned here. We already have
about 500 cases (in WebCore) where people were ignoring this rule.

* Scripts/webkitpy/style/checkers/cpp.py:
(check_language): Allow "bool".
* Scripts/webkitpy/style/checkers/cpp_unittest.py: Add tests.
(CppStyleTest.test_enum_bitfields):
(CppStyleTest.test_plain_integral_bitfields):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@181669 268f45cc-cd09-0410-ab3c-d52691b4dbfc