Update gtest-parallel and introduce gtest-parallel-wrapper.

Now gtest-parallel is the same as in the github repo.
A wrapper script was created to handle the environment variables.

TBR=pbos@webrtc.org
BUG=chromium:497757
NOTRY=True

Review-Url: https://codereview.webrtc.org/2513073002
Cr-Commit-Position: refs/heads/master@{#15170}

third_party/gtest-parallel/README.webrtc

@@ -1,9 +1,13 @@
 URL: https://github.com/google/gtest-parallel
-Version: d0cebaba01c5dbf3af8a1c89b64eed7596c2b56c
+Version: 89b859c1412089468599a3366a72a1e774ce5c2c
 License: Apache 2.0
 License File: LICENSE
 
 Description:
 Parallelization script for gtest binaries.
 
-Local Modifications: None
+Local Modifications:
+Added gtest-parallel-wrapper.py to convert the GTEST_SHARD_INDEX and
+GTEST_TOTAL_SHARDS environment variables to flags, since gtest-parallel takes
+flags as arguments, and delete them afterwards, since letting them set
+introduces a bug where only tests in the first shard are executed.

third_party/gtest-parallel/gtest-parallel

@@ -265,16 +265,13 @@ parser.add_option('--gtest_also_run_disabled_tests', action='store_true',
 parser.add_option('--format', type='string', default='filter',
                   help='output format (raw,filter)')
 parser.add_option('--print_test_times', action='store_true', default=False,
-                  help='When done, list the run time of each test')
-parser.add_option('--shard_count', type='int',
-                  default=int(os.environ.pop('GTEST_TOTAL_SHARDS', 1)),
-                  help=('Total number of shards (for sharding test execution '
-                        'between multiple machines). Default: %default'))
-parser.add_option('--shard_index', type='int',
-                  default=int(os.environ.pop('GTEST_SHARD_INDEX', 0)),
-                  help=('Zero-indexed number identifying this shard (for '
-                        'sharding test execution between multiple machines). '
-                        'Default: %default'))
+                  help='list the run time of each test at the end of execution')
+parser.add_option('--shard_count', type='int', default=1,
+                  help='total number of shards (for sharding test execution '
+                       'between multiple machines)')
+parser.add_option('--shard_index', type='int', default=0,
+                  help='zero-indexed number identifying this shard (for '
+                       'sharding test execution between multiple machines)')
 
 (options, binaries) = parser.parse_args()
 
@@ -288,16 +285,16 @@ if options.format == 'raw':
 elif options.format == 'filter':
   logger = FilterFormat()
 else:
-  sys.exit("Unknown output format: " + options.format)
+  parser.error("Unknown output format: " + options.format)
 
 if options.shard_count < 1:
-  sys.exit("Invalid number of shards: %d. Must be at least 1." %
+  parser.error("Invalid number of shards: %d. Must be at least 1." %
                options.shard_count)
-if options.shard_index < 0 or options.shard_count <= options.shard_index:
-  sys.exit("Invalid shard index: %d. Must be between 0 and %d." %
+if not (0 <= options.shard_index < options.shard_count):
+  parser.error("Invalid shard index: %d. Must be between 0 and %d "
+               "(less than the number of shards)." %
                (options.shard_index, options.shard_count - 1))
 
-
 # Find tests.
 save_file = os.path.join(os.path.expanduser("~"), ".gtest-parallel-times")
 times = TestTimes(save_file)

third_party/gtest-parallel/gtest-parallel-wrapper.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+import os
+import subprocess
+import sys
+
+# GTEST_SHARD_INDEX and GTEST_TOTAL_SHARDS must be removed from the environment
+# otherwise it will be picked up by the binary, causing a bug where only tests
+# in the firsh shard are executed.
+test_env = os.environ.copy()
+gtest_shard_index = test_env.pop('GTEST_SHARD_INDEX', '0')
+gtest_total_shards = test_env.pop('GTEST_TOTAL_SHARDS', '1')
+
+gtest_parallel_path = os.path.dirname(os.path.abspath(__file__))
+gtest_parallel_path = os.path.join(gtest_parallel_path, 'gtest-parallel')
+
+command = [
+    sys.executable,
+    gtest_parallel_path,
+    '--shard_count',
+    gtest_total_shards,
+    '--shard_index',
+    gtest_shard_index,
+] + sys.argv[1:]
+
+print 'gtest-parallel-wrapper: Executing command %s' % ' '.join(command)
+sys.stdout.flush()
+
+sys.exit(subprocess.call(command, env=test_env, cwd=os.getcwd()))

tools/mb/mb.py

@@ -1117,22 +1117,22 @@ class MetaBuildWrapper(object):
           '../../testing/test_env.py',
           '../../testing/xvfb.py',
           '../../third_party/gtest-parallel/gtest-parallel',
+          '../../third_party/gtest-parallel/gtest-parallel-wrapper.py',
       ]
       cmdline = [
           '../../testing/xvfb.py',
           '.',
-        'python',
-        '../../third_party/gtest-parallel/gtest-parallel',
+          '../../third_party/gtest-parallel/gtest-parallel-wrapper.py',
       ] + common_cmdline
     elif test_type in ('windowed_test_launcher', 'console_test_launcher'):
       extra_files = [
           '../../testing/test_env.py',
           '../../third_party/gtest-parallel/gtest-parallel',
+          '../../third_party/gtest-parallel/gtest-parallel-wrapper.py',
       ]
       cmdline = [
           '../../testing/test_env.py',
-          'python',
-          '../../third_party/gtest-parallel/gtest-parallel',
+          '../../third_party/gtest-parallel/gtest-parallel-wrapper.py',
       ] + common_cmdline
     elif test_type == 'non_parallel_console_test_launcher':
       extra_files = [