Add color enhancer as a chromium accessibility extensions.

ui/accessibility/extensions/colorenhancer/res/cvd.css

Index: ui/accessibility/extensions/colorenhancer/res/cvd.css
diff --git a/native_client_sdk/src/libraries/nacl_io/include/memory.h b/ui/accessibility/extensions/colorenhancer/res/cvd.css
similarity index 59%
copy from native_client_sdk/src/libraries/nacl_io/include/memory.h
copy to ui/accessibility/extensions/colorenhancer/res/cvd.css
index 2a656a2dc89e83fcc85a9137d43742677b1f31e3..9d74e17f7732e1e3143a7ce2906b0164ecb480b8 100644
--- a/native_client_sdk/src/libraries/nacl_io/include/memory.h
+++ b/ui/accessibility/extensions/colorenhancer/res/cvd.css
@@ -2,9 +2,10 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
-#ifndef LIBRARIES_NACL_IO_INCLUDE_MEMORY_H_
-#define LIBRARIES_NACL_IO_INCLUDE_MEMORY_H_
+html.filter0 {
+  -webkit-filter: url('#cvd_extension_0');
+}
 
-#include <string.h>
-
-#endif
+html.filter1 {
+  -webkit-filter: url('#cvd_extension_1');
+}