Add chrome perf tests and sniffer to GN build.

build/config/linux/pkg-config.py

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import json
 import os
 import subprocess
 import sys
 import re
 from optparse import OptionParser
 
 # This script runs pkg-config, optionally filtering out some results, and
 # returns the result.
 #
 # The result will be [ <includes>, <cflags>, <libs>, <lib_dirs>, <ldflags> ]
 # where each member is itself a list of strings.
 #
 # You can filter out matches using "-v <regexp>" where all results from
 # pkgconfig matching the given regular expression will be ignored. You can
 # specify more than one regular expression my specifying "-v" more than once.
 #
 # You can specify a sysroot using "-s <sysroot>" where sysroot is the absolute
 # system path to the sysroot used for compiling. This script will attempt to
 # generate correct paths for the sysroot.
 #
 # When using a sysroot, you must also specify the architecture via
 # "-a <arch>" where arch is either "x86" or "x64".
+#
+# Additionally, you can specify the option --atleast-version. This will skip
+# the normal outputting of a dictionary and instead print true or false,
+# depending on the return value of pkg-config for the given package.
 
 # If this is run on non-Linux platforms, just return nothing and indicate
 # success. This allows us to "kind of emulate" a Linux build from other
 # platforms.
 if sys.platform.find("linux") == -1:
   print "[[],[],[],[],[]]"
   sys.exit(0)
 
 
 def SetConfigPath(options):
@@ skipping 61 matching lines @@
   else:
     return path
 
 
 parser = OptionParser()
 parser.add_option('-p', action='store', dest='pkg_config', type='string',
                   default='pkg-config')
 parser.add_option('-v', action='append', dest='strip_out', type='string')
 parser.add_option('-s', action='store', dest='sysroot', type='string')
 parser.add_option('-a', action='store', dest='arch', type='string')
+parser.add_option('--atleast-version', action='store',
+                  dest='atleast_version', type='string')
 (options, args) = parser.parse_args()
 
 # Make a list of regular expressions to strip out.
 strip_out = []
 if options.strip_out != None:
   for regexp in options.strip_out:
     strip_out.append(re.compile(regexp))
 
 SetConfigPath(options)
 if options.sysroot:
   prefix = GetPkgConfigPrefixToStrip(args)
 else:
   prefix = ''
 
+if options.atleast_version:
+  # When asking for the return value, just run pkg-config and print the return
+  # value, no need to do other work.
+  if not subprocess.call([options.pkg_config,
+                          "--atleast-version=" + options.atleast_version] +
+                          args,
+                         env=os.environ):
+    print "true"
+  else:
+    print "false"
+  sys.exit(0)
+
 try:
   flag_string = subprocess.check_output(
       [ options.pkg_config, "--cflags", "--libs-only-l", "--libs-only-L" ] +
       args, env=os.environ)
   # For now just split on spaces to get the args out. This will break if
   # pkgconfig returns quoted things with spaces in them, but that doesn't seem
   # to happen in practice.
   all_flags = flag_string.strip().split(' ')
 except:
   print "Could not run pkg-config."
@@ skipping 27 matching lines @@
     # this anyway. Removing it here prevents a bunch of duplicate inclusions on
     # the command line.
     pass
   else:
     cflags.append(flag)
 
 # Output a GN array, the first one is the cflags, the second are the libs. The
 # JSON formatter prints GN compatible lists when everything is a list of
 # strings.
 print json.dumps([includes, cflags, libs, lib_dirs, ldflags])