gfx_unittests builds on 10.13

ui/gfx/mac/io_surface.cc

 // Copyright 2015 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 "ui/gfx/mac/io_surface.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/command_line.h"
@@ skipping 201 matching lines @@
   static bool color_correct_rendering_enabled =
       base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableColorCorrectRendering);
   if (color_correct_rendering_enabled)
     force_color_space = true;
 
   if (force_color_space) {
     CGColorSpaceRef color_space = color_correct_rendering_enabled
                                       ? base::mac::GetSRGBColorSpace()
                                       : base::mac::GetSystemColorSpace();
-    base::ScopedCFTypeRef<CFDataRef> color_space_icc(
-        CGColorSpaceCopyICCProfile(color_space));
-    // Note that nullptr is an acceptable input to IOSurfaceSetValue.
-    IOSurfaceSetValue(surface, CFSTR("IOSurfaceColorSpace"), color_space_icc);
+    if (__builtin_available(macOS 10.12, *)) {
+      base::ScopedCFTypeRef<CFDataRef> color_space_icc(
+          CGColorSpaceCopyICCProfile(color_space));
+      // Note that nullptr is an acceptable input to IOSurfaceSetValue.
+      IOSurfaceSetValue(surface, CFSTR("IOSurfaceColorSpace"), color_space_icc);
+    }
   }
 
   UMA_HISTOGRAM_TIMES("GPU.IOSurface.CreateTime",
                       base::TimeTicks::Now() - start_time);
   return surface;
 }
 
 }  // namespace gfx