IPC::ChannelMojo: Introduce IPC::MojoBootstrap for Windows

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index b9c9d657def14d6cc4b794e7092cd0db6d8df499..1172ccaee89b47700c620175baa4fb2eba0461ee 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -2086,6 +2086,8 @@ void RenderProcessHostImpl::OnProcessLaunched() {
   // Chrome IPC message.
   MaybeActivateMojo();
 
+  channel_->OnClientLaunched(child_process_launcher_->GetHandle());
+
   while (!queued_messages_.empty()) {
     Send(queued_messages_.front());
     queued_messages_.pop();