Add code to keep track of what fraction of pageviews are top sites.

chrome/browser/prerender/prerender_manager.cc

 // Copyright (c) 2011 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 <string>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "base/string_util.h"
 #include "base/time.h"
 #include "base/values.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/favicon/favicon_tab_helper.h"
+#include "chrome/browser/history/top_sites.h"
 #include "chrome/browser/prerender/prerender_condition.h"
 #include "chrome/browser/prerender/prerender_contents.h"
 #include "chrome/browser/prerender/prerender_final_status.h"
 #include "chrome/browser/prerender/prerender_histograms.h"
 #include "chrome/browser/prerender/prerender_history.h"
 #include "chrome/browser/prerender/prerender_observer.h"
 #include "chrome/browser/prerender/prerender_tracker.h"
 #include "chrome/browser/prerender/prerender_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper_delegate.h"
+#include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/render_messages.h"
 #include "content/browser/browser_thread.h"
+#include "content/browser/cancelable_request.h"
 #include "content/browser/renderer_host/render_process_host.h"
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/browser/renderer_host/resource_dispatcher_host.h"
 #include "content/browser/tab_contents/render_view_host_manager.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/browser/tab_contents/tab_contents_delegate.h"
+#include "content/common/notification_observer.h"
+#include "content/common/notification_registrar.h"
 #include "content/common/notification_service.h"
 
 namespace prerender {
 
 namespace {
 
 // Time window for which we will record windowed PLT's from the last
 // observed link rel=prefetch tag.
 const int kWindowDurationSeconds = 30;
 
@@ skipping 110 matching lines @@
   PendingContentsData(const GURL& url,
                       const GURL& referrer,
                       Origin origin)
       : url_(url), referrer_(referrer), origin_(origin) { }
   ~PendingContentsData() {}
   GURL url_;
   GURL referrer_;
   Origin origin_;
 };
 
+class PrerenderManager::MostVisitedSites : public NotificationObserver {
+ public:
+  explicit MostVisitedSites(Profile* profile) :
+      profile_(profile) {
+    history::TopSites* ts = GetTopSites();
+    if (ts) {
+      registrar_.Add(this, chrome::NOTIFICATION_TOP_SITES_CHANGED,
+                     Source<history::TopSites>(ts));
+    }
+
+    UpdateMostVisited();
+  }
+
+  void UpdateMostVisited() {
+    history::TopSites* ts = GetTopSites();
+    if (ts) {
+      ts->GetMostVisitedURLs(
+          &topsites_consumer_,
+          NewCallback(this,
+                      &prerender::PrerenderManager::MostVisitedSites::
+                      OnMostVisitedURLsAvailable));
+    }
+  }
+
+  void OnMostVisitedURLsAvailable(const history::MostVisitedURLList& data) {
+    urls_.clear();
+    for (int i = 0; i < static_cast<int>(data.size()); i++)
+      urls_.insert(data[i].url);
+  }
+
+  void Observe(int type,
+               const NotificationSource& source,
+               const NotificationDetails& details) {
+    DCHECK_EQ(type, chrome::NOTIFICATION_TOP_SITES_CHANGED);
+    UpdateMostVisited();
+  }
+
+  bool IsTopSite(const GURL& url) const {
+    return (urls_.count(url) > 0);
+  }
+
+ private:
+  history::TopSites* GetTopSites() const {

[dominich, 2011/08/24 23:37:20]

nit: is it worth caching the TopSites pointer instead of the Profile pointer?

+    if (profile_)
+      return profile_->GetTopSites();
+    return NULL;
+  }
+  CancelableRequestConsumer topsites_consumer_;
+  Profile* profile_;
+  NotificationRegistrar registrar_;
+  std::set<GURL> urls_;
+};
+
+bool PrerenderManager::IsTopSite(const GURL& url) const {
+  return most_visited_->IsTopSite(url);
+}
+
 PrerenderManager::PrerenderManager(Profile* profile,
                                    PrerenderTracker* prerender_tracker)
     : enabled_(true),
       profile_(profile),
       prerender_tracker_(prerender_tracker),
       prerender_contents_factory_(PrerenderContents::CreateFactory()),
       last_prerender_start_time_(GetCurrentTimeTicks() -
           base::TimeDelta::FromMilliseconds(kMinTimeBetweenPrerendersMs)),
       runnable_method_factory_(this),
       prerender_history_(new PrerenderHistory(kHistoryLength)),
-      histograms_(new PrerenderHistograms()) {
+      histograms_(new PrerenderHistograms()),
+      most_visited_(new MostVisitedSites(profile)) {
   // There are some assumptions that the PrerenderManager is on the UI thread.
   // Any other checks simply make sure that the PrerenderManager is accessed on
   // the same thread that it was created on.
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 }
 
 PrerenderManager::~PrerenderManager() {
   DestroyAllContents(FINAL_STATUS_MANAGER_SHUTDOWN);
   STLDeleteElements(&prerender_conditions_);
 }
@@ skipping 763 matching lines @@
   DeletePendingDeleteEntries();
 }
 
 void PrerenderManager::RecordFinalStatus(Origin origin,
                                          uint8 experiment_id,
                                          FinalStatus final_status) const {
   histograms_->RecordFinalStatus(origin, experiment_id, final_status);
 }
 
 }  // namespace prerender