Add the UMA PLT.BeginToFinish{,Doc}_AfterPreconnectRequest

chrome/renderer/page_load_histograms.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/page_load_histograms.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 488 matching lines @@
                   begin_to_finish_doc);
     PLT_HISTOGRAM("PLT.BeginToFinish_ContentPrefetcher",
                   begin_to_finish_all_loads);
   }
   if (document_state->was_referred_by_prefetcher()) {
     PLT_HISTOGRAM("PLT.BeginToFinishDoc_ContentPrefetcherReferrer",
                   begin_to_finish_doc);
     PLT_HISTOGRAM("PLT.BeginToFinish_ContentPrefetcherReferrer",
                   begin_to_finish_all_loads);
   }
+  if (document_state->was_after_preconnect_request()) {
+    PLT_HISTOGRAM("PLT.BeginToFinishDoc_AfterPreconnectRequest",
+                  begin_to_finish_doc);
+    PLT_HISTOGRAM("PLT.BeginToFinish_AfterPreconnectRequest",
+                  begin_to_finish_all_loads);
+  }
 
   // TODO(mpcomplete): remove the extension-related histograms after we collect
   // enough data. http://crbug.com/100411
   const bool use_adblock_histogram =
       chrome::ChromeContentRendererClient::IsAdblockInstalled();
   if (use_adblock_histogram) {
     UMA_HISTOGRAM_ENUMERATION(
         "PLT.Abandoned_ExtensionAdblock",
         abandoned_page ? 1 : 0, 2);
     switch (load_type) {
@@ skipping 287 matching lines @@
 
   DCHECK(document_state);
   DCHECK(ds);
   GURL url(ds->request().url());
   Time start = document_state->start_load_time();
   Time finish = document_state->finish_load_time();
   // TODO(mbelshe): should we log more stats?
   VLOG(1) << "PLT: " << (finish - start).InMilliseconds() << "ms "
           << url.spec();
 }