Added a placeholder new media-internals page under a flag.

content/browser/media/media_internals_ui.cc

 // Copyright (c) 2012 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 "content/browser/media/media_internals_ui.h"
 
+#include "base/command_line.h"
 #include "content/browser/media/media_internals_handler.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/browser/web_ui_data_source.h"
+#include "content/public/common/content_switches.h"
 #include "content/public/common/url_constants.h"
 #include "grit/content_resources.h"
 
 namespace content {
 namespace {
 
 WebUIDataSource* CreateMediaInternalsHTMLSource() {
   WebUIDataSource* source =
       WebUIDataSource::Create(kChromeUIMediaInternalsHost);
 
   source->SetJsonPath("strings.js");
-  source->AddResourcePath("media_internals.js", IDR_MEDIA_INTERNALS_JS);
-  source->SetDefaultResource(IDR_MEDIA_INTERNALS_HTML);
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableNewMediaInternals)) {
+    source->AddResourcePath("media_internals.js", IDR_MEDIA_INTERNALS_NEW_JS);
+    source->SetDefaultResource(IDR_MEDIA_INTERNALS_NEW_HTML);

[scherkus (not reviewing), 2013/07/19 01:58:49]

nit: return early here instead of sticking the other code in an else branch

[Ty Overby, 2013/07/19 17:48:00]

Done.

+  } else {
+    source->AddResourcePath("media_internals.js", IDR_MEDIA_INTERNALS_JS);
+    source->SetDefaultResource(IDR_MEDIA_INTERNALS_HTML);
+  }
   return source;
 }
 
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
 //
 // MediaInternalsUI
 //
 ////////////////////////////////////////////////////////////////////////////////
 
 MediaInternalsUI::MediaInternalsUI(WebUI* web_ui)
     : WebUIController(web_ui) {
   web_ui->AddMessageHandler(new MediaInternalsMessageHandler());
 
   BrowserContext* browser_context =
       web_ui->GetWebContents()->GetBrowserContext();
   WebUIDataSource::Add(browser_context, CreateMediaInternalsHTMLSource());
 }
 
 }  // namespace content