GN: Return array from pkgconfig wrapper

GN: Return array from pkgconfig wrapper

This changes the pkg-config wrapper to support filtering out values (we'll need
this for some NSS stuff which will be in a followup patch) and parsing and
returning the results in a GN array in one go, rather than requiring two
invocations.

BUG=
R=scottmg@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=225274

[scottmg, 2013-09-25 21:30:52]

I kind of liked the "don't touch it", are you sure autoquoting isn't going to be
more confusing?

https://codereview.chromium.org/24657003/diff/1/tools/gn/secondary/build/conf...
File tools/gn/secondary/build/config/linux/BUILD.gn (right):

https://codereview.chromium.org/24657003/diff/1/tools/gn/secondary/build/conf...
tools/gn/secondary/build/config/linux/BUILD.gn:16: # This script re
unfinished comment

[brettw, 2013-09-25 21:34:56]

I reverted the escaping change. I was getting worried about this when Nico was
asking me some questions, but there's no strong reason not to. I do think we
should change pkgconfig, though which is the real point of this change.

[scottmg, 2013-09-25 21:47:41]

lgtm

https://codereview.chromium.org/24657003/diff/5001/tools/gn/secondary/build/c...
File tools/gn/secondary/build/config/linux/pkg-config.py (right):

https://codereview.chromium.org/24657003/diff/5001/tools/gn/secondary/build/c...
tools/gn/secondary/build/config/linux/pkg-config.py:66: # Output a GN array, the
first one is the cflags, the second are the libs.
import json
print json.dumps([cflags, libs])

(or not, esp. if you want the trailing , on the last element)

[brettw, 2013-09-25 23:07:30]

Committed patchset #4 manually as r225274 (presubmit successful).