Use kRenderClientId command line flag when starting a render process

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 1577 matching lines @@
 #if defined(OS_WIN)
   command_line->AppendSwitchASCII(
       switches::kDeviceScaleFactor,
       base::DoubleToString(display::win::GetDPIScale()));
 #endif
 
   AppendCompositorCommandLineFlags(command_line);
 
   command_line->AppendSwitchASCII(switches::kServiceRequestChannelToken,
                                   child_connection_->service_token());
+  command_line->AppendSwitchASCII(switches::kRendererClientId,
+                                  std::to_string(GetID()));
 }
 
 void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     const base::CommandLine& browser_cmd,
     base::CommandLine* renderer_cmd) {
   // Propagate the following switches to the renderer command line (along
   // with any associated values) if present in the browser command line.
   static const char* const kSwitchNames[] = {
     switches::kAgcStartupMinVolume,
     switches::kAecRefinedAdaptiveFilter,
@@ skipping 1376 matching lines @@
   bad_message::ReceivedBadMessage(render_process_id,
                                   bad_message::RPH_MOJO_PROCESS_ERROR);
 }
 
 void RenderProcessHostImpl::CreateURLLoaderFactory(
     mojo::InterfaceRequest<mojom::URLLoaderFactory> request) {
   URLLoaderFactoryImpl::Create(resource_message_filter_, std::move(request));
 }
 
 }  // namespace content