[Mojo Video Capture] Implement a VideoCaptureProvider using the Mojo service (part 2)

services/video_capture/service_impl.cc

 // 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 "services/video_capture/service_impl.h"
 
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "services/service_manager/public/cpp/service_context.h"
 #include "services/video_capture/device_factory_provider_impl.h"
 #include "services/video_capture/public/interfaces/constants.mojom.h"
@@ skipping 17 matching lines @@
       // Unretained |this| is safe because |registry_| is owned by |this|.
       base::Bind(&ServiceImpl::OnDeviceFactoryProviderRequest,
                  base::Unretained(this)));
 }
 
 void ServiceImpl::OnBindInterface(
     const service_manager::BindSourceInfo& source_info,
     const std::string& interface_name,
     mojo::ScopedMessagePipeHandle interface_pipe) {
   DCHECK(thread_checker_.CalledOnValidThread());
+  DCHECK(thread_checker_.CalledOnValidThread());
   registry_.BindInterface(source_info, interface_name,
                           std::move(interface_pipe));
 }
 
 bool ServiceImpl::OnServiceManagerConnectionLost() {
   DCHECK(thread_checker_.CalledOnValidThread());
   return true;
 }
 
 void ServiceImpl::OnDeviceFactoryProviderRequest(
@@ skipping 26 matching lines @@
 
 void ServiceImpl::MaybeRequestQuit() {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(ref_factory_);
   if (ref_factory_->HasNoRefs()) {
     context()->RequestQuit();
   }
 }
 
 }  // namespace video_capture