Add Perceived PageLoad Time (PPLT) metrics for Prerender Experiments,...

chrome/browser/prerender/prerender_manager.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/browser/prerender/prerender_manager.h"
 
 #include "base/logging.h"
+#include "base/metrics/histogram.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/prerender/prerender_contents.h"
 #include "chrome/browser/renderer_host/render_view_host.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/browser/tab_contents/render_view_host_manager.h"
 #include "chrome/common/render_messages.h"
 
 struct PrerenderManager::PrerenderContentsData {
   PrerenderContents* contents_;
   base::Time start_time_;
   GURL url_;
   PrerenderContentsData(PrerenderContents* contents,
                         base::Time start_time,
                         GURL url)
       : contents_(contents),
         start_time_(start_time),
         url_(url) {
   }
 };
 
 PrerenderManager::PrerenderManager(Profile* profile)
     : profile_(profile),
       max_prerender_age_(base::TimeDelta::FromSeconds(
           kDefaultMaxPrerenderAgeSeconds)),
-      max_elements_(kDefaultMaxPrerenderElements) {
+      max_elements_(kDefaultMaxPrerenderElements),
+      mode_(PRERENDER_MODE_ENABLED) {
 }
 
 PrerenderManager::~PrerenderManager() {
   while (prerender_list_.size() > 0) {
     PrerenderContentsData data = prerender_list_.front();
     prerender_list_.pop_front();
     delete data.contents_;
   }
 }
 
@@ skipping 57 matching lines @@
   tc->SwapInRenderViewHost(rvh);
 
   ViewHostMsg_FrameNavigate_Params* p = pc->navigate_params();
   if (p != NULL)
     tc->DidNavigate(rvh, *p);
 
   string16 title = pc->title();
   if (!title.empty())
     tc->UpdateTitle(rvh, pc->page_id(), UTF16ToWideHack(title));
 
+  if (pc->has_stopped_loading())
+    tc->DidStopLoading();
+
   return true;
 }
 
 void PrerenderManager::RemoveEntry(PrerenderContents* entry) {
   DCHECK(CalledOnValidThread());
   for (std::list<PrerenderContentsData>::iterator it = prerender_list_.begin();
        it != prerender_list_.end();
        ++it) {
     if (it->contents_ == entry) {
       prerender_list_.erase(it);
@@ skipping 11 matching lines @@
 bool PrerenderManager::IsPrerenderElementFresh(const base::Time start) const {
   base::Time now = GetCurrentTime();
   return (now - start < max_prerender_age_);
 }
 
 PrerenderContents* PrerenderManager::CreatePrerenderContents(
     const GURL& url,
     const std::vector<GURL>& alias_urls) {
   return new PrerenderContents(this, profile_, url, alias_urls);
 }
+
+void PrerenderManager::RecordPerceivedPageLoadTime(base::TimeDelta pplt) {
+  switch(mode_) {
+    case PRERENDER_MODE_EXPERIMENT_CONTROL_GROUP:
+      UMA_HISTOGRAM_TIMES("PLT.PerceivedPageLoadTime_PrerenderControl", pplt);
+      break;
+    case PRERENDER_MODE_EXPERIMENT_PRERENDER_GROUP:
+      UMA_HISTOGRAM_TIMES("PLT.PerceivedPageLoadTime_PrerenderTreatment", pplt);
+      break;
+    default:
+      break;
+  }
+}