A/B experiment for re-establishing TCP connections

chrome/renderer/render_view.cc

 // Copyright (c) 2010 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/render_view.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 4893 matching lines @@
           begin_to_finish_all_loads);
     }
     UMA_HISTOGRAM_ENUMERATION(FieldTrial::MakeName("PLT.Abandoned", "Prefetch"),
                               abandoned_page ? 1 : 0, 2);
     PLT_HISTOGRAM(FieldTrial::MakeName("PLT.BeginToFinishDoc", "Prefetch"),
                   begin_to_finish_doc);
     PLT_HISTOGRAM(FieldTrial::MakeName("PLT.BeginToFinish", "Prefetch"),
                   begin_to_finish_all_loads);
   }
 
+  // Histograms to determine if backup connection jobs have an impact on PLT.
+  static const bool connect_backup_jobs_fieldtrial(
+      FieldTrialList::Find("ConnnectBackupJobs") &&
+      !FieldTrialList::Find("ConnnectBackupJobs")->group_name().empty());
+  if (connect_backup_jobs_fieldtrial) {
+    UMA_HISTOGRAM_ENUMERATION(
+        FieldTrial::MakeName("PLT.Abandoned", "ConnnectBackupJobs"),
+        abandoned_page ? 1 : 0, 2);
+    UMA_HISTOGRAM_ENUMERATION(
+        FieldTrial::MakeName("PLT.LoadType", "ConnnectBackupJobs"),
+        load_type, NavigationState::kLoadTypeMax);
+    switch (load_type) {
+      case NavigationState::NORMAL_LOAD:
+        PLT_HISTOGRAM(FieldTrial::MakeName(
+            "PLT.BeginToFinish_NormalLoad", "ConnnectBackupJobs"),
+            begin_to_finish_all_loads);
+        break;
+      case NavigationState::LINK_LOAD_NORMAL:
+        PLT_HISTOGRAM(FieldTrial::MakeName(
+            "PLT.BeginToFinish_LinkLoadNormal", "ConnnectBackupJobs"),
+            begin_to_finish_all_loads);
+        break;
+      case NavigationState::LINK_LOAD_RELOAD:
+        PLT_HISTOGRAM(FieldTrial::MakeName(
+            "PLT.BeginToFinish_LinkLoadReload", "ConnnectBackupJobs"),
+            begin_to_finish_all_loads);
+        break;
+      case NavigationState::LINK_LOAD_CACHE_STALE_OK:
+        PLT_HISTOGRAM(FieldTrial::MakeName(
+            "PLT.BeginToFinish_LinkLoadStaleOk", "ConnnectBackupJobs"),
+            begin_to_finish_all_loads);
+        break;
+      default:
+        break;
+    }
+  }
+
   // Histograms to determine if the number of connections has an
   // impact on PLT.
   // TODO(jar): Consider removing the per-link-type versions.  We
   //   really only need LINK_LOAD_NORMAL and NORMAL_LOAD.
   static bool use_connection_impact_histogram(
       FieldTrialList::Find("ConnCountImpact") &&
       !FieldTrialList::Find("ConnCountImpact")->group_name().empty());
   if (use_connection_impact_histogram) {
     UMA_HISTOGRAM_ENUMERATION(
         FieldTrial::MakeName("PLT.Abandoned", "ConnCountImpact"),
@@ skipping 642 matching lines @@
   PendingOpenFileSystem* request = pending_file_system_requests_.Lookup(
       request_id);
   DCHECK(request);
   if (accepted)
     request->callbacks->didOpenFileSystem(name, root_path);
   else
     request->callbacks->didFail(WebKit::WebFileErrorSecurity);
   request->callbacks = NULL;
   pending_file_system_requests_.Remove(request_id);
 }