Add "Open with <ARC-app-name>" items to the context menu

ash/renderer_context_menu/open_with_menu_controller.h

Index: ash/renderer_context_menu/open_with_menu_controller.h
diff --git a/ash/renderer_context_menu/open_with_menu_controller.h b/ash/renderer_context_menu/open_with_menu_controller.h
new file mode 100644
index 0000000000000000000000000000000000000000..f8c922acb78679e278706857d537da0c5d35e552
--- /dev/null
+++ b/ash/renderer_context_menu/open_with_menu_controller.h
@@ -0,0 +1,44 @@
+// 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 ASH_RENDERER_CONTEXT_MENU_OPEN_WITH_MENU_CONTROLLER_H_
+#define ASH_RENDERER_CONTEXT_MENU_OPEN_WITH_MENU_CONTROLLER_H_
+
+#include <memory>
+
+#include "ash/ash_export.h"
+#include "base/macros.h"
+
+class GURL;
+
+namespace ash {
+
+class LinkHandlerModel;
+
+// A class for populating and updating "Open with <app>" menu items in a
+// renderer context menu.

[Ben Goodger (Google), 2016/04/20 17:56:50]

your class names and comments should not refer to:
- renderers
- menus

in the ash layer.

-> LinkHandlerModelFactory.

Rather than having a delegate, can you just have the code in components/arc
subclass this & override a do-nothing impl of CreateModel? Then you can have the
code in components/arc just set the property on Shell.

[Yusuke Sato, 2016/04/22 05:27:47]

Done.

+class ASH_EXPORT OpenWithMenuController {
+ public:
+  class Delegate {
+   public:
+    virtual ~Delegate() {}
+    virtual std::unique_ptr<LinkHandlerModel> CreateModel(const GURL& url) = 0;
+  };
+
+  OpenWithMenuController();
+  void SetDelegate(Delegate* delegate);
+
+  // Returns a menu model of the "Open with <app>" context menu. When a menu for
+  // the |url| cannot be created, returns nullptr.
+  std::unique_ptr<LinkHandlerModel> CreateModel(const GURL& url);
+
+ private:
+  Delegate* delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(OpenWithMenuController);
+};
+
+}  // namespace ash
+
+#endif  // ASH_RENDERER_CONTEXT_MENU_OPEN_WITH_MENU_CONTROLLER_H_