Add one more histogram to log how many Request are still pending when

net/http/http_stream_factory_impl.cc

Index: net/http/http_stream_factory_impl.cc
diff --git a/net/http/http_stream_factory_impl.cc b/net/http/http_stream_factory_impl.cc
index 9c38e69f1c9d565b246f8cda6c6087eef0541d51..10d1aab34a41dbd2ee41d3f09fc6b22eed9dc2e3 100644
--- a/net/http/http_stream_factory_impl.cc
+++ b/net/http/http_stream_factory_impl.cc
@@ -372,6 +372,7 @@ void HttpStreamFactoryImpl::AddJobControllerCountToHistograms() {
 
   int alt_job_count = 0;
   int main_job_count = 0;
+  int pending_request_count = 0;
   int preconnect_controller_count = 0;
   for (const auto& job_controller : job_controller_set_) {
     DCHECK(job_controller->HasPendingAltJob() ||
@@ -382,6 +383,8 @@ void HttpStreamFactoryImpl::AddJobControllerCountToHistograms() {
       continue;
     }
     // For non-preconnects.
+    if (job_controller->HasPendingRequest())
+      pending_request_count++;
     if (job_controller->HasPendingAltJob())
       alt_job_count++;
     if (job_controller->HasPendingMainJob())
@@ -393,6 +396,8 @@ void HttpStreamFactoryImpl::AddJobControllerCountToHistograms() {
                           alt_job_count);
   UMA_HISTOGRAM_COUNTS_1M("Net.JobControllerSet.CountOfNonPreconnectMainJob",
                           main_job_count);
+  UMA_HISTOGRAM_COUNTS_1M("Net.JobControllerSet.CountOfPendingRequest",

[Steven Holte, 2017/04/14 22:46:44]

It seems like 1M is much bigger than range of actual values you are recording in
this histogram, so you might consider using a smaller range.  (This will make
the bucket intervals smaller).

+                          pending_request_count);
 }
 
 void HttpStreamFactoryImpl::DumpMemoryStats(