Implement input type=color UI

chrome/browser/ui/base_shell_dialog.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_BASE_SHELL_DIALOG_H_
+#define CHROME_BROWSER_UI_BASE_SHELL_DIALOG_H_
+#pragma once
+
+#include "ui/gfx/native_widget_types.h"
+
+// A base class for shell dialogs.
+class BaseShellDialog {
+ public:
+  // Returns true if a shell dialog box is currently being shown modally
+  // to the specified owner.
+  virtual bool IsRunning(gfx::NativeWindow owning_window) const = 0;
+
+  // Notifies the dialog box that the listener has been destroyed and it should
+  // no longer be sent notifications.
+  virtual void ListenerDestroyed() = 0;
+
+ protected:
+  virtual ~BaseShellDialog() {}
+};
+
+#endif  // CHROME_BROWSER_UI_BASE_SHELL_DIALOG_H_