Add RoutingIDIssuer to help track routing id issues.

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 3d8725c9046ee3c128b4581d3bd9a153e27839cd..7e63fbee5a7bf484c4fd3869240a1500e85198ee 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -1010,6 +1010,8 @@ void RenderProcessHostImpl::AddRoute(
     IPC::Listener* listener) {
   CHECK(!listeners_.Lookup(routing_id))
       << "Found Routing ID Conflict: " << routing_id;
+  CHECK(widget_helper_->IsRoutingIDProbablyValid(routing_id))
+      << "Found Routing ID conflicts: " << routing_id;
   listeners_.AddWithID(listener, routing_id);
 }