Use kRenderClientId command line flag when starting a render process

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 6ca91bed3a272b90adb6bde4aa7d0e2ec2715f07..a239010e900cbb8e4be2245f6e6ce113792a8841 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1584,6 +1584,16 @@ base::WaitableEvent* RenderThreadImpl::GetShutdownEvent() {
   return ChildProcess::current()->GetShutDownEvent();
 }
 
+int32_t RenderThreadImpl::GetClientId() {

[Fady Samuel, 2016/10/28 20:59:34]

if (base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kSingleProcess))) {
  return 1;
}

In single-process mode used for debugging, we don't pass a rendererclientid via
command line because RenderThreadImpl lives in the same process as the browser.

[Alex Z., 2016/10/31 15:19:23]

Done.

+  DCHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kRendererClientId));
+  int client_id;
+  base::StringToInt(base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+                        switches::kRendererClientId),
+                    &client_id);
+  return client_id;
+}
+
 void RenderThreadImpl::OnAssociatedInterfaceRequest(
     const std::string& name,
     mojo::ScopedInterfaceEndpointHandle handle) {