Initialize TaskScheduler in renderers.

content/renderer/render_process_impl.h

Index: content/renderer/render_process_impl.h
diff --git a/content/renderer/render_process_impl.h b/content/renderer/render_process_impl.h
index 768ef7d451b8fd9db839824ade1b3742a90361c5..a622d9bb7868a8238511b7b8ff01b506e72ed806 100644
--- a/content/renderer/render_process_impl.h
+++ b/content/renderer/render_process_impl.h
@@ -25,7 +25,10 @@ class RenderProcessImpl : public RenderProcess {
  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);
 };