[test] Make try-perf script more convenient to use.

tools/try_perf.py

 #!/usr/bin/env python
 # Copyright 2014 the V8 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.
 
 import argparse
 import os
 import subprocess
 import sys
 
 BOTS = {
   '--arm32': 'v8_arm32_perf_try',
   '--linux32': 'v8_linux32_perf_try',
   '--linux64': 'v8_linux64_perf_try',
   '--linux64_atom': 'v8_linux64_atom_perf_try',
   '--linux64_haswell': 'v8_linux64_haswell_perf_try',
   '--nexus5': 'v8_nexus5_perf_try',
   '--nexus7': 'v8_nexus7_perf_try',
   '--nexus9': 'v8_nexus9_perf_try',
   '--nexus10': 'v8_nexus10_perf_try',
 }
 
 DEFAULT_BOTS = [
   'v8_arm32_perf_try',
   'v8_linux32_perf_try',
   'v8_linux64_haswell_perf_try',
   'v8_nexus10_perf_try',
 ]
 
+PUBLIC_BENCHMARKS = [
+  'arewefastyet',
+  'embenchen',
+  'emscripten',
+  'compile',
+  'jetstream',
+  'jsbench',
+  'jstests',
+  'kraken_orig',
+  'massive',
+  'memory',
+  'octane',
+  'octane-pr',
+  'octane-tf',
+  'octane-tf-pr',
+  'simdjs',
+  'sunspider',
+]
+
 V8_BASE = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
 
 def main():
   parser = argparse.ArgumentParser(description='')
   parser.add_argument('benchmarks', nargs='+', help='The benchmarks to run.')
   parser.add_argument('--extra-flags', default='',
                       help='Extra flags to be passed to the executable.')
   for option in sorted(BOTS):
     parser.add_argument(
         option, dest='bots', action='append_const', const=BOTS[option],
         help='Add %s trybot.' % BOTS[option])
   options = parser.parse_args()
   if not options.bots:
     print 'No trybots specified. Using default %s.' % ','.join(DEFAULT_BOTS)
     options.bots = DEFAULT_BOTS
 
   if not options.benchmarks:
     print 'Please specify the benchmarks to run as arguments.'
     return 1
 
+  for benchmark in options.benchmarks:
+    if benchmark not in PUBLIC_BENCHMARKS:
+      print ('%s not found in our benchmark list. The respective trybot might '
+            'fail, unless you run something this script isn\'t aware of. '
+            'Available public benchmarks: %s' % (benchmark, PUBLIC_BENCHMARKS))
+      print 'Proceed anyways? [Y/n] ',
+      answer = sys.stdin.readline().strip()
+      if answer != "" and answer != "Y" and answer != "y":
+        return 1
+
   assert '"' not in options.extra_flags and '\'' not in options.extra_flags, (
       'Invalid flag specification.')
 
   # Ensure depot_tools are updated.
   subprocess.check_output(
       'gclient', shell=True, stderr=subprocess.STDOUT, cwd=V8_BASE)
 
   cmd = ['git cl try -m internal.client.v8']
   cmd += ['-b %s' % bot for bot in options.bots]
   benchmarks = ['"%s"' % benchmark for benchmark in options.benchmarks]
   cmd += ['-p \'testfilter=[%s]\'' % ','.join(benchmarks)]
   if options.extra_flags:
     cmd += ['-p \'extra_flags="%s"\'' % options.extra_flags]
   subprocess.check_call(' '.join(cmd), shell=True, cwd=V8_BASE)
 
 
 if __name__ == '__main__':  # pragma: no cover
   sys.exit(main())