Add PDF compositor service

content/child/child_thread_impl.h

Index: content/child/child_thread_impl.h
diff --git a/content/child/child_thread_impl.h b/content/child/child_thread_impl.h
index af17dac6f05637b15ddb30d9253dce1d03d19c69..fd50fbbf872b88344ff7ed26235f2462357b2769 100644
--- a/content/child/child_thread_impl.h
+++ b/content/child/child_thread_impl.h
@@ -93,6 +93,7 @@ class CONTENT_EXPORT ChildThreadImpl
   void RecordComputedAction(const std::string& action) override;
   ServiceManagerConnection* GetServiceManagerConnection() override;
   service_manager::Connector* GetConnector() override;
+  scoped_refptr<base::SingleThreadTaskRunner> GetIOTaskRunner() override;
 
   // Returns the service_manager::ServiceInfo for the child process & the
   // browser process, once available.
@@ -196,7 +197,6 @@ class CONTENT_EXPORT ChildThreadImpl
   void OnChannelError() override;
 
   bool IsInBrowserProcess() const;
-  scoped_refptr<base::SingleThreadTaskRunner> GetIOTaskRunner();
 
  private:
   class ChildThreadMessageRouter : public IPC::MessageRouter {