Enable runtime features with status=test before WebKit

content/public/renderer/content_renderer_client.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 #define CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 320 matching lines @@
 
   // Notifies that a document element has been inserted in the frame's document.
   // This may be called multiple times for the same document. This method may
   // invalidate the frame.
   virtual void RunScriptsAtDocumentStart(RenderFrame* render_frame) {}
 
   // Notifies that the DOM is ready in the frame's document.
   // This method may invalidate the frame.
   virtual void RunScriptsAtDocumentEnd(RenderFrame* render_frame) {}
 
+  // Allows subclasses to enable some runtime features before WebKit has
+  // started.
+  virtual void SetRuntimeFeaturesDefaultsBeforeWebKitInitialization() {}

[clamy, 2016/09/16 15:20:03]

s/WebKit/Blink

+
   // Notifies that a service worker context has been created. This function
   // is called from the worker thread.
   virtual void DidInitializeServiceWorkerContextOnWorkerThread(
       v8::Local<v8::Context> context,
       int embedded_worker_id,
       const GURL& url) {}
 
   // Notifies that a service worker context will be destroyed. This function
   // is called from the worker thread.
   virtual void WillDestroyServiceWorkerContextOnWorkerThread(
@@ skipping 16 matching lines @@
       shell::InterfaceRegistry* interface_registry) {}
 
   // Overwrites the given URL to use an HTML5 embed if possible.
   // An empty URL is returned if the URL is not overriden.
   virtual GURL OverrideFlashEmbedWithHTML(const GURL& url);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_