Change multi-prerender API to include per launcher slots.

chrome/browser/prerender/prerender_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/browser/prerender/prerender_histograms.h"
 
 #include <string>
 
 #include "base/format_macros.h"
 #include "base/metrics/field_trial.h"
@@ skipping 149 matching lines @@
 }
 
 void PrerenderHistograms::RecordPrerenderStarted(Origin origin) const {
   if (OriginIsOmnibox(origin)) {
     UMA_HISTOGRAM_ENUMERATION(
         StringPrintf("Prerender.OmniboxPrerenderCount%s",
                      PrerenderManager::GetModeString()), 1, 2);
   }
 }
 
-void PrerenderHistograms::RecordConcurrency(size_t prerender_count,
-                                            size_t max_concurrency) const {
-  static const size_t kMaxRecordableConcurrency = 3;
-  DCHECK_GE(kMaxRecordableConcurrency, max_concurrency);
-  if (max_concurrency > 1) {
-    UMA_HISTOGRAM_ENUMERATION(
-        StringPrintf("Prerender.PrerenderCountOf%" PRIuS "Max",
-                     max_concurrency),
-        prerender_count, kMaxRecordableConcurrency + 1);
-  }
+void PrerenderHistograms::RecordConcurrency(size_t prerender_count) const {
+  static const size_t kMaxRecordableConcurrency = 20;
+  DCHECK_GE(kMaxRecordableConcurrency, Config().max_link_concurrency);
+  UMA_HISTOGRAM_ENUMERATION(
+      StringPrintf("Prerender.PrerenderCountOf%" PRIuS "Max",
+                   kMaxRecordableConcurrency),
+      prerender_count, kMaxRecordableConcurrency + 1);
 }
 
 void PrerenderHistograms::RecordUsedPrerender(Origin origin) const {
   if (OriginIsOmnibox(origin)) {
     UMA_HISTOGRAM_ENUMERATION(
         StringPrintf("Prerender.OmniboxNavigationsUsedPrerenderCount%s",
                      PrerenderManager::GetModeString()), 1, 2);
   }
 }
 
@@ skipping 200 matching lines @@
   return last_experiment_id_;
 }
 
 bool PrerenderHistograms::IsOriginExperimentWash() const {
   if (!WithinWindow())
     return false;
   return origin_experiment_wash_;
 }
 
 }  // namespace prerender