Handle interface to prerenders.

chrome/browser/predictors/autocomplete_action_predictor.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/predictors/autocomplete_action_predictor.h"
 
 #include <math.h>
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/guid.h"
 #include "base/i18n/case_conversion.h"
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete.h"
 #include "chrome/browser/autocomplete/autocomplete_log.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/history/history.h"
 #include "chrome/browser/history/history_notifications.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/history/in_memory_database.h"
 #include "chrome/browser/predictors/autocomplete_action_predictor_factory.h"
 #include "chrome/browser/predictors/predictor_database.h"
 #include "chrome/browser/predictors/predictor_database_factory.h"
 #include "chrome/browser/prerender/prerender_field_trial.h"
+#include "chrome/browser/prerender/prerender_handle.h"
 #include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/prerender/prerender_manager_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 
 namespace {
@@ skipping 107 matching lines @@
                   it->destination_url) == match_it->urls.end()) {
       match_it->urls.push_back(it->destination_url);
     }
   }
 }
 
 void AutocompleteActionPredictor::ClearTransitionalMatches() {
   transitional_matches_.clear();
 }
 
+void AutocompleteActionPredictor::StartPrerendering(
+    const GURL& url,
+    content::SessionStorageNamespace* session_storage_namespace,
+    gfx::Size size) {
+  if (prerender_handle_)
+    prerender_handle_->Release();
+  if (prerender::PrerenderManager* prerender_manager =
+          prerender::PrerenderManagerFactory::GetForProfile(profile_)) {
+    prerender_handle_ = prerender_manager->AddPrerenderFromOmnibox(
+        url, session_storage_namespace, size);
+  }
+}
+
 // Given a match, return a recommended action.
 AutocompleteActionPredictor::Action
     AutocompleteActionPredictor::RecommendAction(
         const string16& user_text,
         const AutocompleteMatch& match) const {
   bool is_in_db = false;
   const double confidence = CalculateConfidence(user_text, match, &is_in_db);
   DCHECK(confidence >= 0.0 && confidence <= 1.0);
 
   UMA_HISTOGRAM_BOOLEAN("AutocompleteActionPredictor.MatchIsInDb", is_in_db);
@@ skipping 135 matching lines @@
     return;
 
   const AutocompleteMatch& match = log.result.match_at(log.selected_index);
 
   UMA_HISTOGRAM_BOOLEAN(
       StringPrintf("Prerender.OmniboxNavigationsCouldPrerender%s",
                    prerender::PrerenderManager::GetModeString()).c_str(),
       prerender::IsOmniboxEnabled(profile_));
 
   const GURL& opened_url = match.destination_url;
+
+  // TODO(gavinp,dominich): When we add proper abandonment semantics to
+  // prerenders, we should mark the prerender_ as abandoned here, so that it
+  // won't live the full expiry period.

[dominich, 2012/06/28 00:34:32]

the opened_url might match something in the redirect chain (ie, the alias urls)
so do we really want to mark it as abandoned?

+  // See: http://code.google.com/p/chromium/issues/detail?id=134268
+
   const string16 lower_user_text(base::i18n::ToLower(log.text));
 
   // Traverse transitional matches for those that have a user_text that is a
   // prefix of |lower_user_text|.
   std::vector<AutocompleteActionPredictorTable::Row> rows_to_add;
   std::vector<AutocompleteActionPredictorTable::Row> rows_to_update;
 
   for (std::vector<TransitionalMatch>::const_iterator it =
         transitional_matches_.begin(); it != transitional_matches_.end();
         ++it) {
@@ skipping 229 matching lines @@
   return number_of_hits / (number_of_hits + value.number_of_misses);
 }
 
 AutocompleteActionPredictor::TransitionalMatch::TransitionalMatch() {
 }
 
 AutocompleteActionPredictor::TransitionalMatch::~TransitionalMatch() {
 }
 
 }  // namespace predictors