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

chrome/browser/context_menu/context_menu_content_type_platform_app.cc

Index: chrome/browser/context_menu/context_menu_content_type_platform_app.cc
diff --git a/chrome/browser/context_menu/context_menu_content_type_platform_app.cc b/chrome/browser/context_menu/context_menu_content_type_platform_app.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d5be66126c06edeb6b4baa41587d6149ee7d7919
--- /dev/null
+++ b/chrome/browser/context_menu/context_menu_content_type_platform_app.cc
@@ -0,0 +1,36 @@
+// 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/context_menu/context_menu_content_type_platform_app.h"
+
+#include "base/command_line.h"
+#include "chrome/common/chrome_switches.h"
+#include "extensions/common/extension.h"
+#include "extensions/common/manifest.h"
+
+ContextMenuContentTypePlatformApp::ContextMenuContentTypePlatformApp(
+    content::RenderFrameHost* render_frame_host,
+    const content::ContextMenuParams& params)
+    : ContextMenuContentType(render_frame_host, params) {
+}
+
+ContextMenuContentTypePlatformApp::~ContextMenuContentTypePlatformApp() {
+}
+
+bool ContextMenuContentTypePlatformApp::SupportsGroup(int group) {
+  switch (group) {
+    case ITEM_GROUP_EDITABLE:
+    case ITEM_GROUP_COPY:
+      return ContextMenuContentType::SupportsGroup(group);
+    case ITEM_GROUP_CURRENT_EXTENSION:
+      return true;
+    case ITEM_GROUP_DEVTOOLS_UNPACKED_EXT:
+      return extensions::Manifest::IsUnpackedLocation(
+                 GetExtension()->location()) ||
+             CommandLine::ForCurrentProcess()->HasSwitch(
+                 switches::kDebugPackedApps);
+    default:
+      return false;
+  }
+}