[test] Refactoring: Remove code duplication in perf runner.

tools/run_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.
 
 """
 Performance runner for d8.
 
 Call e.g. with tools/run-perf.py --arch ia32 some_suite.json
 
@@ skipping 446 matching lines @@
     yield node
   elif isinstance(node, Node):
     for child in node._children:
       for result in FlattenRunnables(child, node_cb):
         yield result
   else:  # pragma: no cover
     raise Exception("Invalid suite configuration.")
 
 
 class Platform(object):
+  def __init__(self, options):
+    self.shell_dir = options.shell_dir
+    self.extra_flags = options.extra_flags.split()
+
   @staticmethod
   def GetPlatform(options):
     if options.arch.startswith("android"):
       return AndroidPlatform(options)
     else:
       return DesktopPlatform(options)
 
 
 class DesktopPlatform(Platform):
   def __init__(self, options):
-    self.shell_dir = options.shell_dir
-    self.extra_flags = options.extra_flags.split()
+    super(DesktopPlatform, self).__init__(options)
 
   def PreExecution(self):
     pass
 
   def PostExecution(self):
     pass
 
   def PreTests(self, node, path):
     if isinstance(node, Runnable):
       node.ChangeCWD(path)
@@ skipping 16 matching lines @@
       print output.stderr
     if output.timed_out:
       print ">>> Test timed out after %ss." % runnable.timeout
     return output.stdout
 
 
 class AndroidPlatform(Platform):  # pragma: no cover
   DEVICE_DIR = "/data/local/tmp/v8/"
 
   def __init__(self, options):
-    self.shell_dir = options.shell_dir
-    self.extra_flags = options.extra_flags.split()
+    super(AndroidPlatform, self).__init__(options)
     LoadAndroidBuildTools(options.android_build_tools)
 
     if not options.device:
       # Detect attached device if not specified.
       devices = pylib.android_commands.GetAttachedDevices(
           hardware=True, emulator=False, offline=False)
       assert devices and len(devices) == 1, (
           "None or multiple devices detected. Please specify the device on "
           "the command-line with --device")
       options.device = devices[0]
@@ skipping 197 matching lines @@
 
   if options.json_test_results:
     results.WriteToFile(options.json_test_results)
   else:  # pragma: no cover
     print results
 
   return min(1, len(results.errors))
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(Main(sys.argv[1:]))