Initialize TaskScheduler in renderers.

content/renderer/render_process_impl.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_RENDERER_RENDER_PROCESS_IMPL_H_
 #define CONTENT_RENDERER_RENDER_PROCESS_IMPL_H_
 
 #include "base/macros.h"
 #include "content/renderer/render_process.h"
 
 namespace content {
 
 // Implementation of the RenderProcess interface for the regular browser.
 // See also MockRenderProcess which implements the active "RenderProcess" when
 // running under certain unit tests.
 class RenderProcessImpl : public RenderProcess {
  public:
   RenderProcessImpl();
   ~RenderProcessImpl() override;
 
   // RenderProcess implementation.
   void AddBindings(int bindings) override;
   int GetEnabledBindings() const override;
 
  private:
   // Bitwise-ORed set of extra bindings that have been enabled anywhere in this
   // process.  See BindingsPolicy for details.
-  int enabled_bindings_;
+  int enabled_bindings_ = 0;
+
+  // True if the constructor initialized a TaskScheduler.
+  bool initialized_task_scheduler_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(RenderProcessImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_PROCESS_IMPL_H_