[Experimental Framework] Move the trial token public key out of content and into the embedder.

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 302 matching lines @@
 
   // Notifies that a service worker context will be destroyed. This function
   // is called from the worker thread.
   virtual void WillDestroyServiceWorkerContextOnWorkerThread(
       v8::Local<v8::Context> context,
       const GURL& url) {}
 
   // Whether this renderer should enforce preferences related to the WebRTC
   // routing logic, i.e. allowing multiple routes and non-proxied UDP.
   virtual bool ShouldEnforceWebRTCRoutingPreferences();
+
+  // Returns the public key to be used for origin trials, or an empty string if
+  // origin trials are not enabled in this context.
+  virtual base::StringPiece GetOriginTrialPublicKey();
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_