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

chrome/browser/renderer_context_menu/context_menu_content_type_app_mode.cc

Index: chrome/browser/renderer_context_menu/context_menu_content_type_app_mode.cc
diff --git a/chrome/browser/renderer_context_menu/context_menu_content_type_app_mode.cc b/chrome/browser/renderer_context_menu/context_menu_content_type_app_mode.cc
new file mode 100644
index 0000000000000000000000000000000000000000..72574f5a20a819874db91259170f2408d8f18ec3
--- /dev/null
+++ b/chrome/browser/renderer_context_menu/context_menu_content_type_app_mode.cc
@@ -0,0 +1,24 @@
+// 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.
+
+#include "chrome/browser/renderer_context_menu/context_menu_content_type_app_mode.h"
+
+ContextMenuContentTypeAppMode::ContextMenuContentTypeAppMode(
+    content::RenderFrameHost* render_frame_host,
+    const content::ContextMenuParams& params)
+    : ContextMenuContentType(render_frame_host, params, false) {
+}
+
+ContextMenuContentTypeAppMode::~ContextMenuContentTypeAppMode() {
+}
+
+bool ContextMenuContentTypeAppMode::SupportsGroup(int group) {
+  switch (group) {
+    case ITEM_GROUP_EDITABLE:
+    case ITEM_GROUP_COPY:
+      return ContextMenuContentType::SupportsGroup(group);
+    default:
+      return false;
+  }
+}