Allow arbitrary scale factors.

testing/xvfb.py

 #!/usr/bin/env python
 # 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.
 
 """Runs the test with xvfb on linux. Runs the test normally on other platforms.
 
 For simplicity in gyp targets, this script just runs the test normal on
 non-linux platforms.
 """
@@ skipping 32 matching lines @@
 def start_xvfb(xvfb_path, display):
   """Starts a virtual X server that we run the tests in.
 
   This makes it so we can run the tests even if we didn't start the tests from
   an X session.
 
   Args:
     xvfb_path: Path to Xvfb.
   """
   cmd = [xvfb_path, display, '-screen', '0', '1024x768x24', '-ac',
-         '-nolisten', 'tcp']
+         '-nolisten', 'tcp', '-dpi', '96']
   try:
     proc = subprocess.Popen(
         cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
   except OSError:
     print >> sys.stderr, 'Failed to run %s' % ' '.join(cmd)
     return
   return proc
 
 
 def wait_for_xvfb(xdisplaycheck, env):
@@ skipping 73 matching lines @@
 def main():
   if len(sys.argv) < 3:
     print >> sys.stderr, (
         'Usage: xvfb.py [path to build_dir] [command args...]')
     return 2
   return run_executable(sys.argv[2:], sys.argv[1], os.environ.copy())
 
 
 if __name__ == "__main__":
   sys.exit(main())