Add a helper script for triggering tests on swarming.

Usage: trigger.py <GN path> <test> <os_dim> <gpu_dim> <-s shards>

This script can circumvent the trybots when attempting a job on a
specific configuration. It must be used within a Chromium checkout
currently. In the future we can likely use it in standalone.

Optional arguments can specify the number of swarming shards, the pool,
and extra command line test parameters like --gtest_filter.

Bug: angleproject:3272
Change-Id: Ia79f4422786c463378fc7e0f7f5ae4d07bd097a0
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1524700
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>

scripts/trigger.bat

@@ -0,0 +1 @@
+@python %~dp0\trigger.py %*

scripts/trigger.py

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+#!/usr/bin/python2
+#
+# Copyright 2019 The ANGLE 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.
+#
+# trigger.py:
+#   Helper script for triggering GPU tests on swarming.
+
+import argparse
+import os
+import subprocess
+import sys
+
+
+def parse_args():
+    parser = argparse.ArgumentParser(os.path.basename(sys.argv[0]))
+    parser.add_argument('gn_path', help='path to GN. (e.g. out/Release)')
+    parser.add_argument('test', help='test name. (e.g. angle_end2end_tests)')
+    parser.add_argument('os_dim', help='OS dimension. (e.g. Windows-10)')
+    parser.add_argument('gpu_dim', help='GPU dimension. (e.g. intel-hd-630-win10-stable)')
+    parser.add_argument('-s', '--shards', default=1, help='number of shards', type=int)
+    parser.add_argument('-p', '--pool', default='Chrome-GPU', help='swarming pool')
+    parser.add_argument('extra_args', help='extra test command line arguments', nargs='*')
+    return parser.parse_args()
+
+
+def main():
+    args = parse_args()
+    path = args.gn_path.replace('\\', '/')
+    out_gn_path = '//' + path
+    out_file_path = os.path.join(*path.split('/'))
+
+    mb_script_path = os.path.join('tools', 'mb', 'mb.py')
+    subprocess.call(['python', mb_script_path, 'isolate', out_gn_path, args.test])
+
+    isolate_script_path = os.path.join('tools', 'swarming_client', 'isolate.py')
+    isolate_file = os.path.join(out_file_path, '%s.isolate' % args.test)
+    isolated_file = os.path.join(out_file_path, '%s.isolated' % args.test)
+
+    isolate_args = [
+        'python', isolate_script_path, 'archive',
+        '-I', 'https://isolateserver.appspot.com',
+        '-i', isolate_file,
+        '-s', isolated_file]
+    stdout = subprocess.check_output(isolate_args)
+    sha = stdout[:40]
+
+    print('Got an isolated SHA of %s' % sha)
+    swarming_script_path = os.path.join('tools', 'swarming_client', 'swarming.py')
+
+    swarmings_args = [
+        'python', swarming_script_path, 'trigger',
+        '-S', 'chromium-swarm.appspot.com',
+        '-I', 'isolateserver.appspot.com',
+        '-d', 'os', args.os_dim,
+        '-d', 'pool', args.pool,
+        '-d', 'gpu', args.gpu_dim,
+        '--shards=%d' % args.shards,
+        '-s', sha]
+
+    if args.extra_args:
+        swarmings_args += ['--'] + args.extra_args
+
+    print(' '.join(swarmings_args))
+    subprocess.call(swarmings_args)
+    return 0
+
+
+if __name__ == '__main__':
+    sys.exit(main())