Telemetry: extends Platform abstraction.

tools/telemetry/telemetry/desktop_browser_finder.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 """Finds desktop browsers that can be controlled by telemetry."""
 
 import logging
 import os
 import subprocess
 import sys
 
@@ skipping 18 matching lines @@
     super(PossibleDesktopBrowser, self).__init__(browser_type, options)
     self._local_executable = executable
     self._is_content_shell = is_content_shell
 
   def __repr__(self):
     return 'PossibleDesktopBrowser(browser_type=%s)' % self.browser_type
 
   def Create(self):
     backend = desktop_browser_backend.DesktopBrowserBackend(
         self._options, self._local_executable, self._is_content_shell)
-    b = browser.Browser(backend, platform.Platform())
+    b = browser.Browser(backend, platform.EmptyPlatform())
     backend.SetBrowser(b)
     return b
 
 def FindAllAvailableBrowsers(options):
   """Finds all the desktop browsers available on this machine."""
   browsers = []
 
   has_display = True
   if (sys.platform.startswith('linux') and
       os.getenv('DISPLAY') == None):
@@ skipping 94 matching lines @@
                     chromium_app_name, False):
         break
 
   if len(browsers) and not has_display:
     logging.warning(
       'Found (%s), but you do not have a DISPLAY environment set.' %
       ','.join([b.browser_type for b in browsers]))
     return []
 
   return browsers