Add symbolic_constants_posix and its test

Add symbolic_constants_posix and its test.

This includes the functions SignalToString() and StringToSignal().

TEST=util_test SymbolicConstantsPOSIX.*
R=rsesek@chromium.org

Committed: https://chromium.googlesource.com/crashpad/crashpad/+/a01c87059b37117f6e2a8060fea964ee493be9eb

[Mark Mentovai, 2014-09-10 19:35:08]

mark@chromium.org changed reviewers:
+ rsesek@chromium.org

[Robert Sesek, 2014-09-10 20:01:04]

https://codereview.chromium.org/565453002/diff/20001/util/misc/symbolic_const...
File util/misc/symbolic_constants_common.h (right):

https://codereview.chromium.org/565453002/diff/20001/util/misc/symbolic_const...
util/misc/symbolic_constants_common.h:20: // Symbolic constant terminology:
Can this comment be added to Doxygen somehow?

https://codereview.chromium.org/565453002/diff/20001/util/posix/symbolic_cons...
File util/posix/symbolic_constants_posix.cc (right):

https://codereview.chromium.org/565453002/diff/20001/util/posix/symbolic_cons...
util/posix/symbolic_constants_posix.cc:17: #include <sys/signal.h>
Just for NSIG? (maybe "// for NSIG" if that's the case).

https://codereview.chromium.org/565453002/diff/20001/util/posix/symbolic_cons...
util/posix/symbolic_constants_posix.cc:129: return
std::string(kSigPrefix).append(signal_name);
StringPrintf instead? Not sure which would be more efficient.

[Mark Mentovai, 2014-09-10 20:30:34]

Patchset #3 (id:40001) has been deleted

[Mark Mentovai, 2014-09-10 20:30:53]

Updated.

https://codereview.chromium.org/565453002/diff/20001/util/posix/symbolic_cons...
File util/posix/symbolic_constants_posix.cc (right):

https://codereview.chromium.org/565453002/diff/20001/util/posix/symbolic_cons...
util/posix/symbolic_constants_posix.cc:17: #include <sys/signal.h>
rsesek wrote:
> Just for NSIG? (maybe "// for NSIG" if that's the case).

Not a huge fan of those “for X” comments on #includes because they tend to get
out of sync with the code even faster than ordinary comments.

[Robert Sesek, 2014-09-10 21:06:51]

LGTM

[Mark Mentovai, 2014-09-10 21:30:24]

Committed patchset #3 (id:60001) manually as a01c870 (presubmit successful).