Move display preference code from ash/display/ to ui/display/manager/.

ui/display/manager/json_converter.h

Index: ui/display/manager/json_converter.h
diff --git a/ui/display/manager/json_converter.h b/ui/display/manager/json_converter.h
new file mode 100644
index 0000000000000000000000000000000000000000..5082e761c011e0adf99e687471890193685e2037
--- /dev/null
+++ b/ui/display/manager/json_converter.h
@@ -0,0 +1,25 @@
+// 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.
+
+#ifndef UI_DISPLAY_MANAGER_JSON_CONVERTER_H_
+#define UI_DISPLAY_MANAGER_JSON_CONVERTER_H_
+
+#include "ui/display/manager/display_manager_export.h"
+
+namespace base {
+class Value;
+}
+
+namespace display {
+class DisplayLayout;
+
+DISPLAY_MANAGER_EXPORT bool JsonToDisplayLayout(const base::Value& value,
+                                                DisplayLayout* layout);
+
+DISPLAY_MANAGER_EXPORT bool DisplayLayoutToJson(const DisplayLayout& layout,
+                                                base::Value* value);
+
+}  // namespace display
+
+#endif  // UI_DISPLAY_MANAGER_JSON_CONVERTER_H_