Implement input type=color UI

content/public/browser/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 CONTENT_PUBLIC_BROWSER_COLOR_CHOOSER_H_
+#define CONTENT_PUBLIC_BROWSER_COLOR_CHOOSER_H_
+#pragma once
+
+#include "third_party/skia/include/core/SkColor.h"
+
+namespace content {
+
+class RenderViewHost;
+class WebContents;
+
+// Abstraction object for color choosers for each platform.
+class ColorChooser {
+ public:
+  static ColorChooser* Create(int identifier,
+                              WebContents* tab,
+                              SkColor initial_color);
+  ColorChooser(int identifier) : identifier_(identifier) {}
+  virtual ~ColorChooser() {}
+
+  // Returns a unique identifier for this chooser.  Identifiers are unique
+  // across a renderer process.  This avoids race conditions in synchronizing
+  // the browser and renderer processes.  For example, if a renderer closes one
+  // chooser and opens another, and simultaneously the user picks a color in the
+  // first chooser, the IDs can be used to drop the "chose a color" message
+  // rather than erroneously tell the renderer that the user picked a color in
+  // the second chooser.
+  int identifier() const { return identifier_; }
+
+  // Ends connection with color chooser. Closes color chooser depending on the
+  // platform.
+  virtual void End() = 0;
+
+  // Sets the selected color.
+  virtual void SetSelectedColor(SkColor color) = 0;
+
+private:
+  int identifier_;
+};
+
+}
+
+#endif  // CONTENT_PUBLIC_BROWSER_COLOR_CHOOSER_H_