Supplement should have a Member to the corresponding Supplementable object (Part 1)

third_party/WebKit/Source/core/dom/CompositorProxyClient.cpp

 // Copyright 2016 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.
 
 #include "core/dom/CompositorProxyClient.h"
 
 #include "platform/TraceEvent.h"
 
 namespace blink {
 
 CompositorProxyClient* CompositorProxyClient::from(WorkerClients* clients)
 {
     return static_cast<CompositorProxyClient*>(Supplement<WorkerClients>::from(clients, supplementName()));
 }
 
 const char* CompositorProxyClient::supplementName()
 {
     return "CompositorProxyClient";
 }
 
+CompositorProxyClient::CompositorProxyClient(WorkerClients& clients)
+    : Supplement<WorkerClients>(clients)
+{
+}
+
 void provideCompositorProxyClientTo(WorkerClients* clients, CompositorProxyClient* client)
 {
     clients->provideSupplement(CompositorProxyClient::supplementName(), client);
 }
 
 } // namespace blink