headless: Allow both WW,HH and WWxHH forms for specifying window size

headless/app/headless_shell_switches.cc

 // Copyright 2016 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.
 
 #include "headless/app/headless_shell_switches.h"
 
 namespace headless {
 namespace switches {
 
 // Instructs headless_shell to cause network fetches to complete in order of
@@ skipping 36 matching lines @@
 const char kUserDataDir[] = "user-data-dir";
 
 // If set the system waits the specified number of virtual milliseconds before
 // deeming the page to be ready.  For determinism virtual time does not advance
 // while there are pending network fetches (i.e no timers will fire). Once all
 // network fetches have completed, timers fire and if the system runs out of
 // virtual time is fastforwarded so the next timer fires immediatley, until the
 // specified virtual time budget is exhausted.
 const char kVirtualTimeBudget[] = "virtual-time-budget";
 
-// Sets the initial window size. Provided as string in the format "800x600".
+// Sets the initial window size. Provided as string in the format "800,600".
 const char kWindowSize[] = "window-size";
 
 }  // namespace switches
 }  // namespace headless