Implement a runtime headless mode for Linux

ui/gfx/icc_profile_x11.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 <stddef.h>
 
 extern "C" {
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 }
 
+#include "base/command_line.h"
 #include "ui/gfx/icc_profile.h"
-
+#include "ui/gfx/switches.h"
 #include "ui/gfx/x/x11_types.h"
 
 namespace gfx {
 
 // static
 ICCProfile ICCProfile::FromBestMonitor() {
   ICCProfile icc_profile;
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(switches::kHeadless))
+    return icc_profile;
   Atom property = XInternAtom(GetXDisplay(), "_ICC_PROFILE", true);
   if (property != None) {
     Atom prop_type = None;
     int prop_format = 0;
     unsigned long nitems = 0;
     unsigned long nbytes = 0;
     char* property_data = NULL;
     if (XGetWindowProperty(
             GetXDisplay(), DefaultRootWindow(GetXDisplay()), property, 0,
             0x1FFFFFFF /* MAXINT32 / 4 */, False, AnyPropertyType, &prop_type,
             &prop_format, &nitems, &nbytes,
             reinterpret_cast<unsigned char**>(&property_data)) == Success) {
       icc_profile = FromData(property_data, nitems);
       XFree(property_data);
     }
   }
   return icc_profile;
 }
 
 }  // namespace gfx