Add JobController/Job count to UMA histograms when the count hits limit

net/http/http_stream_factory_impl.h

Index: net/http/http_stream_factory_impl.h
diff --git a/net/http/http_stream_factory_impl.h b/net/http/http_stream_factory_impl.h
index ce29d1f737245db52d205d9bb0f360e4afb51d14..be905d92a53aece6e5b78583d8eb85323daeb1c0 100644
--- a/net/http/http_stream_factory_impl.h
+++ b/net/http/http_stream_factory_impl.h
@@ -171,6 +171,10 @@ class NET_EXPORT_PRIVATE HttpStreamFactoryImpl : public HttpStreamFactory {
   // priorities.
   bool ProxyServerSupportsPriorities(const ProxyInfo& proxy_info) const;
 
+  // Add the numbers of JobControllers and Jobs that are not completed to UMA
+  // histograms.
+  void AddJobControllerCountToHistograms() const;
+
   HttpNetworkSession* const session_;
 
   // All Requests/Preconnects are assigned with a JobController to manage