Overhaul microbenchmark so that it can be pulled in easily by any package

src/platform/minijail/SConstruct

Index: src/platform/minijail/SConstruct
diff --git a/src/platform/minijail/SConstruct b/src/platform/minijail/SConstruct
index 6ffe69f5e46d9758b7afbb32c949ef0d95ff38dd..464514c6c6e5721027ff97d556ac0972793e53e2 100644
--- a/src/platform/minijail/SConstruct
+++ b/src/platform/minijail/SConstruct
@@ -4,6 +4,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import glob
 import os
 
 env = Environment()
@@ -15,8 +16,7 @@ lib_sources = env.Split("""env.cc
 bin_sources = env.Split("""minijail_main.cc""")
 test_sources = env.Split("""minijail_unittest.cc
                             minijail_testrunner.cc""")
-
-#test_sources = env.Split("""../base/strutil.cc""")
+benchmark_sources = glob.glob("*_microbenchmark.cc")
 
 env.Append(
     CPPPATH=['..', '../../third_party/chrome/files', '../../common'],
@@ -32,5 +32,14 @@ env_bin = env.Clone()
 env_bin.Program('minijail', lib_sources + bin_sources)
 
 env_test = env.Clone()
-env_test.Append(LIBS=['gtest', 'pcrecpp'])
+env_test.Append(LIBS=['gtest'])
 env_test.Program('minijail_unittests', lib_sources + test_sources)
+
+env_benchmarks = env.Clone()
+# Note, LIBS needs to have: 'gtest', 'base', 'rt', 'pthread'
+env_benchmarks.Append(LIBS=['microbenchmark_main.a',
+                            # Since we want to run this on a prod image,
+                            # we just statically pull in gtest.a.
+                            File('/usr/lib/libgtest.a')],
+                      LIBPATH=['../microbenchmark'])
+env_benchmarks.Program('minijail_benchmarks', benchmark_sources)