Enable runtime features with status=test before WebKit

content/public/renderer/content_renderer_client.h

Index: content/public/renderer/content_renderer_client.h
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
index 752ae2d0b16b34378b13ec35dd3863c0210eebf4..14d85506bf142819d1b5ed5591806ddbeef7ffe0 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -338,6 +338,10 @@ class CONTENT_EXPORT ContentRendererClient {
   // This method may invalidate the frame.
   virtual void RunScriptsAtDocumentEnd(RenderFrame* render_frame) {}
 
+  // Allows subclasses to enable some runtime features before Blink has
+  // started.
+  virtual void SetRuntimeFeaturesDefaultsBeforeBlinkInitialization() {}
+
   // Notifies that a service worker context has been created. This function
   // is called from the worker thread.
   virtual void DidInitializeServiceWorkerContextOnWorkerThread(