Added optional sharding for browser builders in the annotated steps scripts

tools/bots/compiler.py

 #!/usr/bin/python
 
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """
 Dart2js buildbot steps
 
 Runs tests for the  dart2js compiler.
 """
 
 import platform
 import os
 import re
 import shutil
 import subprocess
 import sys
 
 import bot
 
 DART2JS_BUILDER = (
     r'dart2js-(linux|mac|windows)(-(jsshell))?-(debug|release)(-(checked|host-checked))?(-(host-checked))?(-(minified))?-?(\d*)-?(\d*)')
 WEB_BUILDER = (
-    r'dart2js-(ie9|ie10|ff|safari|chrome|opera)-(win7|win8|mac|linux)(-(all|html))?')
+    r'dart2js-(ie9|ie10|ff|safari|chrome|opera)-(win7|win8|mac|linux)(-(all|html))?(-(\d+)-(\d+))?')
 
 
 def GetBuildInfo(builder_name, is_buildbot):
   """Returns a BuildInfo object for the current buildbot based on the
      name of the builder.
   """
   compiler = None
   runtime = None
   mode = None
   system = None
   checked = False
   host_checked = False
   minified = False
   shard_index = None
   total_shards = None
   test_set = None
 
   dart2js_pattern = re.match(DART2JS_BUILDER, builder_name)
   web_pattern = re.match(WEB_BUILDER, builder_name)
 
   if web_pattern:
     compiler = 'dart2js'
     runtime = web_pattern.group(1)
     system = web_pattern.group(2)
     mode = 'release'
     test_set = web_pattern.group(4)
+    shard_index = web_pattern.group(6)
+    total_shards = web_pattern.group(7)
   elif dart2js_pattern:
     compiler = 'dart2js'
     system = dart2js_pattern.group(1)
     runtime = 'd8'
     if dart2js_pattern.group(3) == 'jsshell':
       runtime = 'jsshell'
     mode = dart2js_pattern.group(4)
     # The valid naming parts for checked and host-checked are:
     # Empty: checked=False, host_checked=False
     # -checked: checked=True, host_checked=False
@@ skipping 254 matching lines @@
   """
   with bot.BuildStep('Build SDK and d8'):
     args = [sys.executable, './tools/build.py', '--mode=' + build_info.mode,
             'dart2js_bot']
     print 'Build SDK and d8: %s' % (' '.join(args))
     bot.RunProcess(args)
 
 
 if __name__ == '__main__':
   bot.RunBot(GetBuildInfo, RunCompilerTests, build_step=BuildCompiler)