Support for retreiving the monitor color space on X11.

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 "ui/gfx/icc_profile.h"
+
+#include "ui/gfx/x/x11_types.h"
+
+namespace gfx {
+
+// static
+ICCProfile ICCProfile::FromBestMonitor() {
+  ICCProfile 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