Separate out logic to handle different category/group of context menu items from RVContextMenu class

chrome/browser/tab_contents/menu_context/menu_context_app_mode.h

Index: chrome/browser/tab_contents/menu_context/menu_context_app_mode.h
diff --git a/chrome/browser/tab_contents/menu_context/menu_context_app_mode.h b/chrome/browser/tab_contents/menu_context/menu_context_app_mode.h
new file mode 100644
index 0000000000000000000000000000000000000000..eb5baed74b0009da88ca38ae0f591128327c06f1
--- /dev/null
+++ b/chrome/browser/tab_contents/menu_context/menu_context_app_mode.h
@@ -0,0 +1,27 @@
+// Copyright 2014 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_TAB_CONTENTS_MENU_CONTEXT_MENU_CONTEXT_APP_MODE_H_
+#define CHROME_BROWSER_TAB_CONTENTS_MENU_CONTEXT_MENU_CONTEXT_APP_MODE_H_
+
+#include "chrome/browser/tab_contents/menu_context/menu_context.h"
+
+class MenuContextAppMode : public MenuContext {
+ public:
+  virtual ~MenuContextAppMode();
+
+  // MenuContext overrides.
+  virtual bool SupportsGroup(int group) OVERRIDE;
+
+ protected:
+  MenuContextAppMode(content::RenderFrameHost* render_frame_host,
+                     const content::ContextMenuParams& params);
+
+ private:
+  friend class MenuContextFactory;
+
+  DISALLOW_COPY_AND_ASSIGN(MenuContextAppMode);
+};
+
+#endif  // CHROME_BROWSER_TAB_CONTENTS_MENU_CONTEXT_MENU_CONTEXT_APP_MODE_H_