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

chrome/browser/renderer_context_menu/open_with_menu_observer.h

+// 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 CHROME_BROWSER_RENDERER_CONTEXT_MENU_OPEN_WITH_MENU_OBSERVER_H_
+#define CHROME_BROWSER_RENDERER_CONTEXT_MENU_OPEN_WITH_MENU_OBSERVER_H_
+
+#include <set>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "components/renderer_context_menu/render_view_context_menu_observer.h"
+
+class RenderViewContextMenuProxy;
+
+// An observer that listens to events from the RenderViewContextMenu class and
+// shows app names received from ARC that can handle the current URL.
+class OpenWithMenuObserver : public RenderViewContextMenuObserver {
+ public:
+  explicit OpenWithMenuObserver(RenderViewContextMenuProxy* proxy);
+  ~OpenWithMenuObserver() override;
+
+  // RenderViewContextMenuObserver implementation.
+  void InitMenu(const content::ContextMenuParams& params) override;
+  bool IsCommandIdSupported(int command_id) override;
+  bool IsCommandIdChecked(int command_id) override;
+  bool IsCommandIdEnabled(int command_id) override;
+  void ExecuteCommand(int command_id) override;
+  void OnMenuCancel() override;
+
+ private:
+  RenderViewContextMenuProxy* const proxy_;
+  int num_items_initially_enabled_;
+
+  DISALLOW_COPY_AND_ASSIGN(OpenWithMenuObserver);
+};
+
+#endif  // CHROME_BROWSER_RENDERER_CONTEXT_MENU_OPEN_WITH_MENU_OBSERVER_H_