Refactor GuestView construction

chrome/browser/guest_view/app_view/app_view_guest.cc

 // 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/guest_view/app_view/app_view_guest.h"
 
+#include "base/command_line.h"
 #include "chrome/browser/extensions/chrome_extension_web_contents_observer.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/guest_view/app_view/app_view_constants.h"
 #include "chrome/browser/guest_view/guest_view_manager.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/renderer_context_menu/context_menu_delegate.h"
 #include "chrome/browser/renderer_context_menu/render_view_context_menu.h"
+#include "chrome/common/chrome_switches.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/common/renderer_preferences.h"
 #include "extensions/browser/api/app_runtime/app_runtime_api.h"
 #include "extensions/browser/event_router.h"
 #include "extensions/browser/extension_host.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/lazy_background_task_queue.h"
 #include "extensions/browser/view_type_utils.h"
 #include "extensions/common/api/app_runtime.h"
 #include "extensions/common/extension_messages.h"
@@ skipping 56 matching lines @@
 
   response_info->app_view_guest->
       CompleteCreateWebContents(url,
                                 response_info->guest_extension,
                                 response_info->callback);
 
   response_map->erase(guest_instance_id);
   return true;
 }
 
+// static
+GuestViewBase* AppViewGuest::Create(content::BrowserContext* browser_context,
+                                    int guest_instance_id) {
+  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableAppView)) {
+    return NULL;
+  }
+  return new AppViewGuest(browser_context, guest_instance_id);
+}
+
 AppViewGuest::AppViewGuest(content::BrowserContext* browser_context,
                            int guest_instance_id)
     : GuestView<AppViewGuest>(browser_context, guest_instance_id),
       weak_ptr_factory_(this) {
 }
 
 AppViewGuest::~AppViewGuest() {
 }
 
 extensions::WindowController* AppViewGuest::GetExtensionWindowController()
@@ skipping 141 matching lines @@
     return;
   }
 
   scoped_ptr<base::DictionaryValue> embed_request(new base::DictionaryValue());
   embed_request->SetInteger(appview::kGuestInstanceID, GetGuestInstanceID());
   embed_request->SetString(appview::kEmbedderID, embedder_extension_id());
   extensions::AppRuntimeEventRouter::DispatchOnEmbedRequestedEvent(
       profile, embed_request.Pass(), extension_host->extension());
 }