Implement input type=color UI

chrome/browser/ui/color_chooser_dialog.h

+// Copyright (c) 2011 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_DIALOG_H_
+#define CHROME_BROWSER_UI_COLOR_CHOOSER_DIALOG_H_
+#pragma once
+
+#include "chrome/browser/ui/base_shell_dialog.h"
+#include "base/memory/ref_counted.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebColor.h"
+
+// Shows a dialog for choosing color.
+class ColorChooserDialog
+    : public base::RefCountedThreadSafe<ColorChooserDialog>,
+      public BaseShellDialog {
+ public:
+  // An interface implemented by a Listener object wishing to know about the
+  // the results from the color chooser dialog.
+  class Listener {
+   public:
+    virtual void DidChooseColor(WebKit::WebColor color) = 0;
+    virtual void DidEnd() = 0;
+  };
+
+  // Creates a dialog box helper. This object is ref-counted, but the returned
+  // object will have no reference (refcount is 0).
+  static ColorChooserDialog* Create(Listener* listener);
+
+  // Opens the color chooser dialog.
+  virtual void SelectColor(WebKit::WebColor initial_color,
+                   gfx::NativeWindow owning_window) = 0;
+
+  explicit ColorChooserDialog() { }
+
+  DISALLOW_COPY_AND_ASSIGN(ColorChooserDialog);
+};
+
+#endif  // CHROME_BROWSER_UI_COLOR_CHOOSER_DIALOG_H_