Implement input type=color UI

chrome/browser/ui/color_chooser.h

+// Copyright (c) 2012 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 CHROME_BROWSER_UI_COLOR_CHOOSER_H_
+#define CHROME_BROWSER_UI_COLOR_CHOOSER_H_
+#pragma once
+
+#include "content/public/browser/color_chooser.h"
+
+class RenderViewHost;
+
+// Abstraction object for color choosers for each platforms.
+class ColorChooser : public content::ColorChooser {
+ public:
+  static ColorChooser* Create(
+      int identifier, RenderViewHost* rvh, SkColor initial_color);
+};
+
+#endif  // CHROME_BROWSER_UI_COLOR_CHOOSER_H_