Control TaskScheduler initialization params in renderers via field trial.

chrome/renderer/chrome_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 CHROME_RENDERER_CHROME_CONTENT_RENDERER_CLIENT_H_
 #define CHROME_RENDERER_CHROME_CONTENT_RENDERER_CLIENT_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 164 matching lines @@
   void DidInitializeServiceWorkerContextOnWorkerThread(
       v8::Local<v8::Context> context,
       int64_t service_worker_version_id,
       const GURL& url) override;
   void WillDestroyServiceWorkerContextOnWorkerThread(
       v8::Local<v8::Context> context,
       int64_t service_worker_version_id,
       const GURL& url) override;
   bool ShouldEnforceWebRTCRoutingPreferences() override;
   GURL OverrideFlashEmbedWithHTML(const GURL& url) override;
+  void GetTaskSchedulerInitializationParams(
+      std::vector<base::SchedulerWorkerPoolParams>* params_vector,
+      base::TaskScheduler::WorkerPoolIndexForTraitsCallback*
+          index_to_traits_callback) override;
 
 #if BUILDFLAG(ENABLE_SPELLCHECK)
   // Sets a new |spellcheck|. Used for testing only.
   // Takes ownership of |spellcheck|.
   void SetSpellcheck(SpellCheck* spellcheck);
 #endif
 
 #if BUILDFLAG(ENABLE_PLUGINS)
   static blink::WebPlugin* CreatePlugin(
       content::RenderFrame* render_frame,
@@ skipping 56 matching lines @@
 #endif
 
 #if defined(OS_CHROMEOS)
   std::unique_ptr<LeakDetectorRemoteClient> leak_detector_remote_client_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ChromeContentRendererClient);
 };
 
 #endif  // CHROME_RENDERER_CHROME_CONTENT_RENDERER_CLIENT_H_