Remove PrerenderLocalPredictor, part 1.

chrome/browser/prerender/prerender_local_predictor.h

Index: chrome/browser/prerender/prerender_local_predictor.h
diff --git a/chrome/browser/prerender/prerender_local_predictor.h b/chrome/browser/prerender/prerender_local_predictor.h
deleted file mode 100644
index d1dd79f48b23ddf8605b16587071ba700535839e..0000000000000000000000000000000000000000
--- a/chrome/browser/prerender/prerender_local_predictor.h
+++ /dev/null
@@ -1,248 +0,0 @@
-// 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.
-
-#ifndef CHROME_BROWSER_PRERENDER_PRERENDER_LOCAL_PREDICTOR_H_
-#define CHROME_BROWSER_PRERENDER_PRERENDER_LOCAL_PREDICTOR_H_
-
-#include <map>
-#include <vector>
-
-#include "base/containers/hash_tables.h"
-#include "base/memory/scoped_vector.h"
-#include "base/memory/weak_ptr.h"
-#include "base/scoped_observer.h"
-#include "base/task/cancelable_task_tracker.h"
-#include "base/timer/timer.h"
-#include "components/history/core/browser/history_service_observer.h"
-#include "components/history/core/browser/visit_database.h"
-#include "net/url_request/url_fetcher_delegate.h"
-#include "url/gurl.h"
-
-namespace base {
-class DictionaryValue;
-}
-
-namespace content {
-class WebContents;
-}
-
-namespace gfx {
-class Size;
-}
-
-namespace history {
-class HistoryService;
-}
-
-namespace prerender {
-
-class PrerenderHandle;
-class PrerenderManager;
-
-// PrerenderLocalPredictor maintains local browsing history to make prerender
-// predictions.
-// At this point, the class is not actually creating prerenders, but just
-// recording timing stats about the effect prerendering would have.
-//
-// TODO(davidben): Prune this class down to only what it's still being used for.
-class PrerenderLocalPredictor : public history::HistoryServiceObserver,
-                                public net::URLFetcherDelegate {
- public:
-  struct LocalPredictorURLInfo;
-  struct CandidatePrerenderInfo;
-  // A class simulating a set of URLs prefetched, for statistical purposes.
-  class PrefetchList;
-  enum Event {
-    EVENT_CONSTRUCTED = 0,
-    EVENT_INIT_SCHEDULED = 1,
-    EVENT_INIT_STARTED = 2,
-    EVENT_INIT_FAILED_NO_HISTORY = 3,
-    EVENT_INIT_SUCCEEDED = 4,
-    EVENT_ADD_VISIT = 5,
-    EVENT_ADD_VISIT_INITIALIZED = 6,
-    EVENT_ADD_VISIT_PRERENDER_IDENTIFIED = 7,
-    EVENT_ADD_VISIT_RELEVANT_TRANSITION = 8,
-    EVENT_ADD_VISIT_IDENTIFIED_PRERENDER_CANDIDATE = 9,
-    EVENT_ADD_VISIT_PRERENDERING = 10,
-    // Obsolete: EVENT_GOT_PRERENDER_URL = 11,
-    EVENT_ERROR_NO_PRERENDER_URL_FOR_PLT = 12,
-    EVENT_ADD_VISIT_PRERENDERING_EXTENDED = 13,
-    EVENT_PRERENDER_URL_LOOKUP_RESULT = 14,
-    EVENT_PRERENDER_URL_LOOKUP_RESULT_ROOT_PAGE = 15,
-    EVENT_PRERENDER_URL_LOOKUP_RESULT_IS_HTTP = 16,
-    EVENT_PRERENDER_URL_LOOKUP_RESULT_HAS_QUERY_STRING = 17,
-    EVENT_PRERENDER_URL_LOOKUP_RESULT_CONTAINS_LOGOUT = 18,
-    EVENT_PRERENDER_URL_LOOKUP_RESULT_CONTAINS_LOGIN = 19,
-    EVENT_START_URL_LOOKUP = 20,
-    // Obsolete: EVENT_ADD_VISIT_NOT_ROOTPAGE = 21,
-    EVENT_URL_WHITELIST_ERROR = 22,
-    EVENT_URL_WHITELIST_OK = 23,
-    EVENT_PRERENDER_URL_LOOKUP_RESULT_ON_WHITELIST = 24,
-    EVENT_PRERENDER_URL_LOOKUP_RESULT_ON_WHITELIST_ROOT_PAGE = 25,
-    EVENT_PRERENDER_URL_LOOKUP_RESULT_EXTENDED_ROOT_PAGE = 26,
-    EVENT_PRERENDER_URL_LOOKUP_RESULT_ROOT_PAGE_HTTP = 27,
-    EVENT_PRERENDER_URL_LOOKUP_FAILED = 28,
-    EVENT_PRERENDER_URL_LOOKUP_NO_SOURCE_WEBCONTENTS_FOUND = 29,
-    EVENT_PRERENDER_URL_LOOKUP_NO_LOGGED_IN_TABLE_FOUND = 30,
-    EVENT_PRERENDER_URL_LOOKUP_ISSUING_LOGGED_IN_LOOKUP = 31,
-    EVENT_CONTINUE_PRERENDER_CHECK_STARTED = 32,
-    EVENT_CONTINUE_PRERENDER_CHECK_NO_URL = 33,
-    EVENT_CONTINUE_PRERENDER_CHECK_PRIORITY_TOO_LOW = 34,
-    EVENT_CONTINUE_PRERENDER_CHECK_URLS_IDENTICAL_BUT_FRAGMENT = 35,
-    EVENT_CONTINUE_PRERENDER_CHECK_HTTPS = 36,
-    EVENT_CONTINUE_PRERENDER_CHECK_ROOT_PAGE = 37,
-    EVENT_CONTINUE_PRERENDER_CHECK_LOGOUT_URL = 38,
-    EVENT_CONTINUE_PRERENDER_CHECK_LOGIN_URL = 39,
-    EVENT_CONTINUE_PRERENDER_CHECK_NOT_LOGGED_IN = 40,
-    EVENT_CONTINUE_PRERENDER_CHECK_FALLTHROUGH_NOT_PRERENDERING = 41,
-    EVENT_CONTINUE_PRERENDER_CHECK_ISSUING_PRERENDER = 42,
-    EVENT_ISSUING_PRERENDER = 43,
-    EVENT_NO_PRERENDER_CANDIDATES = 44,
-    EVENT_GOT_HISTORY_ISSUING_LOOKUP = 45,
-    EVENT_TAB_HELPER_URL_SEEN = 46,
-    EVENT_TAB_HELPER_URL_SEEN_MATCH = 47,
-    EVENT_TAB_HELPER_URL_SEEN_NAMESPACE_MATCH = 48,
-    EVENT_PRERENDER_URL_LOOKUP_MULTIPLE_SOURCE_WEBCONTENTS_FOUND = 49,
-    EVENT_CONTINUE_PRERENDER_CHECK_ON_SIDE_EFFECT_FREE_WHITELIST = 50,
-    EVENT_CONTINUE_PRERENDER_CHECK_EXAMINE_NEXT_URL = 51,
-    EVENT_ISSUE_PRERENDER_ALREADY_PRERENDERING = 52,
-    EVENT_ISSUE_PRERENDER_NEW_PRERENDER = 53,
-    EVENT_ISSUE_PRERENDER_CANCELLED_OLD_PRERENDER = 54,
-    EVENT_CONTINUE_PRERENDER_CHECK_FALLTHROUGH_PRERENDERING = 55,
-    EVENT_PRERENDER_URL_LOOKUP_SUCCESS = 56,
-    EVENT_PRERENDER_SERVICE_DISABLED = 57,
-    EVENT_PRERENDER_SERVICE_ISSUED_LOOKUP = 58,
-    EVENT_PRERENDER_SERVICE_LOOKUP_TIMED_OUT = 59,
-    EVENT_PRERENDER_SERVICE_RECEIVED_RESULT = 60,
-    EVENT_PRERENDER_SERVICE_NO_RECORD_FOR_RESULT = 61,
-    EVENT_PRERENDER_SERVICE_PARSED_CORRECTLY = 62,
-    EVENT_PRERENDER_SERVICE_PARSE_ERROR = 63,
-    EVENT_PRERENDER_SERVICE_PARSE_ERROR_INCORRECT_JSON = 64,
-    EVENT_PRERENDER_SERVICE_HINTING_TIMED_OUT = 65,
-    EVENT_PRERENDER_SERVICE_HINTING_URL_LOOKUP_TIMED_OUT = 66,
-    EVENT_PRERENDER_SERVICE_CANDIDATE_URL_LOOKUP_TIMED_OUT = 67,
-    EVENT_CONTINUE_PRERENDER_CHECK_ON_SERVICE_WHITELIST = 68,
-    EVENT_CONTINUE_PRERENDER_CHECK_EXAMINE_NEXT_URL_LOCAL = 69,
-    EVENT_CONTINUE_PRERENDER_CHECK_EXAMINE_NEXT_URL_SERVICE = 70,
-    EVENT_ADD_VISIT_RELEVANT_TRANSITION_REPEAT_URL = 71,
-    EVENT_ADD_VISIT_RELEVANT_TRANSITION_NEW_URL = 72,
-    // Obsolete: EVENT_TAB_HELPER_URL_SEEN_NAMESPACE_MISMATCH_NO_NAMESPACE = 73,
-    // Obsolete: EVENT_TAB_HELPER_URL_SEEN_NAMESPACE_MISMATCH_MERGE_ISSUED = 74,
-    // Obsolete: EVENT_NAMESPACE_MISMATCH_MERGE_RESULT_RECEIVED = 75,
-    // Obsolete: EVENT_NAMESPACE_MISMATCH_MERGE_RESULT_NAMESPACE_NOT_FOUND = 76,
-    // Obsolete: EVENT_NAMESPACE_MISMATCH_MERGE_RESULT_NOT_LOGGING = 77,
-    // Obsolete: EVENT_NAMESPACE_MISMATCH_MERGE_RESULT_NO_TRANSACTIONS = 78,
-    // Obsolete: EVENT_NAMESPACE_MISMATCH_MERGE_RESULT_TOO_MANY_TRANSACTIONS = 79,
-    // Obsolete: EVENT_NAMESPACE_MISMATCH_MERGE_RESULT_NOT_MERGEABLE = 80,
-    // Obsolete: EVENT_NAMESPACE_MISMATCH_MERGE_RESULT_MERGEABLE = 81,
-    EVENT_INIT_FAILED_UNENCRYPTED_SYNC_NOT_ENABLED = 82,
-    EVENT_CONTINUE_PRERENDER_CHECK_EXAMINE_NEXT_URL_NOT_SKIPPED = 83,
-    EVENT_PRERENDER_SERVICE_RETURNED_HINTING_CANDIDATES = 84,
-    // Obsolete: EVENT_NAMESPACE_MISMATCH_MERGE_RESULT_NAMESPACE_NOT_ALIAS = 85,
-    EVENT_TAB_HELPER_URL_SEEN_MATCH_ENTRY = 86,
-    EVENT_TAB_HELPER_URL_SEEN_MATCH_BROWSER_NAVIGATE = 87,
-    EVENT_TAB_HELPER_URL_SEEN_NAMESPACE_MATCH_ENTRY = 88,
-    EVENT_TAB_HELPER_URL_SEEN_NAMESPACE_MATCH_BROWSER_NAVIGATE = 89,
-    EVENT_PREFETCH_LIST_ADDED = 90,
-    EVENT_PREFETCH_LIST_SEEN_TABCONTENTS = 91,
-    EVENT_PREFETCH_LIST_SEEN_HISTORY = 92,
-    EVENT_ISSUE_PRERENDER_CALLED = 93,
-    EVENT_ISSUE_PRERENDER_PREFETCH_ENABLED = 94,
-    EVENT_ISSUE_PRERENDER_PREFETCH_ISSUED = 95,
-    EVENT_MAX_VALUE
-  };
-
-  // A PrerenderLocalPredictor is owned by the PrerenderManager specified
-  // in the constructor.  It will be destoryed at the time its owning
-  // PrerenderManager is destroyed.
-  explicit PrerenderLocalPredictor(PrerenderManager* prerender_manager);
-  ~PrerenderLocalPredictor() override;
-
-  void Shutdown();
-
-  // history::HistoryServiceObserver:
-  void OnAddVisit(history::HistoryService* history_service,
-                  const history::BriefVisitInfo& info) override;
-
-  void OnGetInitialVisitHistory(
-      scoped_ptr<std::vector<history::BriefVisitInfo> > visit_history);
-
-  void OnPLTEventForURL(const GURL& url, base::TimeDelta page_load_time);
-
-  void OnTabHelperURLSeen(const GURL& url, content::WebContents* web_contents);
-
-  // net::URLFetcherDelegate implementation:
-  void OnURLFetchComplete(const net::URLFetcher* source) override;
-
- private:
-  struct PrerenderProperties;
-  history::HistoryService* GetHistoryIfExists() const;
-  void Init();
-  bool IsPrerenderStillValid(PrerenderProperties* prerender) const;
-  bool DoesPrerenderMatchPLTRecord(PrerenderProperties* prerender,
-                                   const GURL& url,
-                                   base::TimeDelta plt) const;
-  void RecordEvent(Event event) const;
-
-  void OnLookupURL(scoped_ptr<CandidatePrerenderInfo> info);
-
-  // Lookup the prerender candidate in the Prerender Service (if applicable).
-  void DoPrerenderServiceCheck(scoped_ptr<CandidatePrerenderInfo> info);
-
-  // Lookup the prerender candidate in the LoggedIn Predictor.
-  void DoLoggedInLookup(scoped_ptr<CandidatePrerenderInfo> info);
-
-  // Returns an element of issued_prerenders_, which should be replaced
-  // by a new prerender of the priority indicated, or NULL, if the priority
-  // is too low (or if the URL requested is already prerendering).
-  PrerenderProperties* GetIssuedPrerenderSlotForPriority(const GURL& url,
-                                                         double priority);
-
-  void ContinuePrerenderCheck(scoped_ptr<CandidatePrerenderInfo> info);
-  void LogCandidateURLStats(const GURL& url) const;
-  void IssuePrerender(CandidatePrerenderInfo* info,
-                      LocalPredictorURLInfo* url_info);
-  void MaybeCancelURLFetcher(net::URLFetcher* fetcher);
-  // Returns true if the parsed response is semantically correct and could
-  // be fully applied.
-  bool ApplyParsedPrerenderServiceResponse(
-      base::DictionaryValue* dict,
-      CandidatePrerenderInfo* info,
-      bool* hinting_timed_out,
-      bool* hinting_url_lookup_timed_out,
-      bool* candidate_url_lookup_timed_out);
-  typedef std::map<net::URLFetcher*, CandidatePrerenderInfo*>
-      OutstandingFetchers;
-  OutstandingFetchers outstanding_prerender_service_requests_;
-  PrerenderManager* prerender_manager_;
-  base::OneShotTimer<PrerenderLocalPredictor> timer_;
-
-  // Delay after which to initialize, to avoid putting to much load on the
-  // database thread early on when Chrome is starting up.
-  static const int kInitDelayMs = 5 * 1000;
-
-  base::CancelableTaskTracker history_db_tracker_;
-
-  scoped_ptr<std::vector<history::BriefVisitInfo> > visit_history_;
-
-  scoped_ptr<PrerenderProperties> current_prerender_;
-  scoped_ptr<PrerenderProperties> last_swapped_in_prerender_;
-
-  ScopedVector<PrerenderProperties> issued_prerenders_;
-
-  base::hash_set<int64> url_whitelist_;
-
-  scoped_ptr<PrefetchList> prefetch_list_;
-
-  ScopedObserver<history::HistoryService, history::HistoryServiceObserver>
-      history_service_observer_;
-
-  base::WeakPtrFactory<PrerenderLocalPredictor> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(PrerenderLocalPredictor);
-};
-
-}  // namespace prerender
-
-#endif  // CHROME_BROWSER_PRERENDER_PRERENDER_LOCAL_PREDICTOR_H_