Remove old webui History page on desktop and mobile

chrome/browser/resources/history/history.js

-// 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 src="../uber/uber_utils.js">
-// <include src="history_focus_manager.js">
-
-///////////////////////////////////////////////////////////////////////////////
-// Globals:
-/** @const */ var RESULTS_PER_PAGE = 150;
-
-// Amount of time between pageviews that we consider a 'break' in browsing,
-// measured in milliseconds.
-/** @const */ var BROWSING_GAP_TIME = 15 * 60 * 1000;
-
-// The largest bucket value for UMA histogram, based on entry ID. All entries
-// with IDs greater than this will be included in this bucket.
-/** @const */ var UMA_MAX_BUCKET_VALUE = 1000;
-
-// The largest bucket value for a UMA histogram that is a subset of above.
-/** @const */ var UMA_MAX_SUBSET_BUCKET_VALUE = 100;
-
-// TODO(glen): Get rid of these global references, replace with a controller
-//     or just make the classes own more of the page.
-var historyModel;
-var historyView;
-var pageState;
-var selectionAnchor = -1;
-var activeVisit = null;
-
-/** @const */ var Command = cr.ui.Command;
-/** @const */ var FocusOutlineManager = cr.ui.FocusOutlineManager;
-/** @const */ var Menu = cr.ui.Menu;
-/** @const */ var MenuItem = cr.ui.MenuItem;
-
-/**
- * Enum that shows the filtering behavior for a host or URL to a supervised
- * user. Must behave like the FilteringBehavior enum from
- * supervised_user_url_filter.h.
- * @enum {number}
- */
-var SupervisedUserFilteringBehavior = {
-  ALLOW: 0,
-  WARN: 1,
-  BLOCK: 2
-};
-
-/**
- * Returns true if the mobile (non-desktop) version is being shown.
- * @return {boolean} true if the mobile version is being shown.
- */
-function isMobileVersion() {
-  return !document.body.classList.contains('uber-frame');
-}
-
-/**
- * Record an action in UMA.
- * @param {string} actionDesc The name of the action to be logged.
- */
-function recordUmaAction(actionDesc) {
-  chrome.send('metricsHandler:recordAction', [actionDesc]);
-}
-
-/**
- * Record a histogram value in UMA. If specified value is larger than the max
- * bucket value, record the value in the largest bucket.
- * @param {string} histogram The name of the histogram to be recorded in.
- * @param {number} maxBucketValue The max value for the last histogram bucket.
- * @param {number} value The value to record in the histogram.
- */
-function recordUmaHistogram(histogram, maxBucketValue, value) {
-  chrome.send('metricsHandler:recordInHistogram',
-              [histogram,
-              ((value > maxBucketValue) ? maxBucketValue : value),
-              maxBucketValue]);
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// Visit:
-
-/**
- * Class to hold all the information about an entry in our model.
- * @param {HistoryEntry} result An object containing the visit's data.
- * @param {boolean} continued Whether this visit is on the same day as the
- *     visit before it.
- * @param {HistoryModel} model The model object this entry belongs to.
- * @constructor
- */
-function Visit(result, continued, model) {
-  this.model_ = model;
-  this.title_ = result.title;
-  this.url_ = result.url;
-  this.domain_ = result.domain;
-  this.starred_ = result.starred;
-  this.fallbackFaviconText_ = result.fallbackFaviconText;
-
-  // These identify the name and type of the device on which this visit
-  // occurred. They will be empty if the visit occurred on the current device.
-  this.deviceName = result.deviceName;
-  this.deviceType = result.deviceType;
-
-  // The ID will be set according to when the visit was displayed, not
-  // received. Set to -1 to show that it has not been set yet.
-  this.id_ = -1;
-
-  this.isRendered = false;  // Has the visit already been rendered on the page?
-
-  // All the date information is public so that owners can compare properties of
-  // two items easily.
-
-  this.date = new Date(result.time);
-
-  // See comment in BrowsingHistoryHandler::QueryComplete - we won't always
-  // get all of these.
-  this.dateRelativeDay = result.dateRelativeDay;
-  this.dateTimeOfDay = result.dateTimeOfDay;
-  this.dateShort = result.dateShort;
-
-  // Shows the filtering behavior for that host (only used for supervised
-  // users).
-  // A value of |SupervisedUserFilteringBehavior.ALLOW| is not displayed so it
-  // is used as the default value.
-  this.hostFilteringBehavior = SupervisedUserFilteringBehavior.ALLOW;
-  if (result.hostFilteringBehavior)
-    this.hostFilteringBehavior = result.hostFilteringBehavior;
-
-  this.blockedVisit = result.blockedVisit;
-
-  // Whether this is the continuation of a previous day.
-  this.continued = continued;
-
-  this.allTimestamps = result.allTimestamps;
-}
-
-// Visit, public: -------------------------------------------------------------
-
-/**
- * Returns a dom structure for a browse page result or a search page result.
- * @param {Object} propertyBag A bag of configuration properties, false by
- * default:
- *  - isSearchResult: Whether or not the result is a search result.
- *  - addTitleFavicon: Whether or not the favicon should be added.
- *  - useMonthDate: Whether or not the full date should be inserted (used for
- * monthly view).
- * @return {Node} A DOM node to represent the history entry or search result.
- */
-Visit.prototype.getResultDOM = function(propertyBag) {
-  var isSearchResult = propertyBag.isSearchResult || false;
-  var addTitleFavicon = propertyBag.addTitleFavicon || false;
-  var useMonthDate = propertyBag.useMonthDate || false;
-  var focusless = propertyBag.focusless || false;
-  var node = createElementWithClassName('li', 'entry');
-  var time = createElementWithClassName('span', 'time');
-  var entryBox = createElementWithClassName('div', 'entry-box');
-  var domain = createElementWithClassName('div', 'domain');
-
-  this.id_ = this.model_.getNextVisitId();
-  var self = this;
-
-  // Only create the checkbox if it can be used to delete an entry.
-  if (this.model_.editingEntriesAllowed) {
-    var checkbox = document.createElement('input');
-    checkbox.type = 'checkbox';
-    checkbox.id = 'checkbox-' + this.id_;
-    checkbox.time = this.date.getTime();
-    checkbox.setAttribute('aria-label', loadTimeData.getStringF(
-        'entrySummary',
-        this.dateTimeOfDay,
-        this.starred_ ? loadTimeData.getString('bookmarked') : '',
-        this.title_,
-        this.domain_));
-    checkbox.addEventListener('click', checkboxClicked);
-    entryBox.appendChild(checkbox);
-
-    if (focusless)
-      checkbox.tabIndex = -1;
-
-    if (!isMobileVersion()) {
-      // Clicking anywhere in the entryBox will check/uncheck the checkbox.
-      entryBox.setAttribute('for', checkbox.id);
-      entryBox.addEventListener('mousedown', this.handleMousedown_.bind(this));
-      entryBox.addEventListener('click', entryBoxClick);
-      entryBox.addEventListener('keydown', this.handleKeydown_.bind(this));
-    }
-  }
-
-  // Keep track of the drop down that triggered the menu, so we know
-  // which element to apply the command to.
-  // TODO(dubroy): Ideally we'd use 'activate', but MenuButton swallows it.
-  var setActiveVisit = function(e) {
-    activeVisit = self;
-    var menu = $('action-menu');
-    menu.dataset.devicename = self.deviceName;
-    menu.dataset.devicetype = self.deviceType;
-  };
-  domain.textContent = this.domain_;
-
-  entryBox.appendChild(time);
-
-  var bookmarkSection = createElementWithClassName(
-      'button', 'bookmark-section custom-appearance');
-  if (this.starred_) {
-    bookmarkSection.title = loadTimeData.getString('removeBookmark');
-    bookmarkSection.classList.add('starred');
-    bookmarkSection.addEventListener('click', function f(e) {
-      recordUmaAction('HistoryPage_BookmarkStarClicked');
-      chrome.send('removeBookmark', [self.url_]);
-
-      this.model_.getView().onBeforeUnstarred(this);
-      bookmarkSection.classList.remove('starred');
-      this.model_.getView().onAfterUnstarred(this);
-
-      bookmarkSection.removeEventListener('click', f);
-      e.preventDefault();
-    }.bind(this));
-  }
-
-  if (focusless)
-    bookmarkSection.tabIndex = -1;
-
-  entryBox.appendChild(bookmarkSection);
-
-  if (addTitleFavicon || this.blockedVisit) {
-    var faviconSection = createElementWithClassName('div', 'favicon');
-    if (this.blockedVisit)
-      faviconSection.classList.add('blocked-icon');
-    else
-      this.loadFavicon_(faviconSection);
-    entryBox.appendChild(faviconSection);
-  }
-
-  var visitEntryWrapper = /** @type {HTMLElement} */(
-      entryBox.appendChild(document.createElement('div')));
-  if (addTitleFavicon || this.blockedVisit)
-    visitEntryWrapper.classList.add('visit-entry');
-  if (this.blockedVisit) {
-    visitEntryWrapper.classList.add('blocked-indicator');
-    visitEntryWrapper.appendChild(this.getVisitAttemptDOM_());
-  } else {
-    var title = visitEntryWrapper.appendChild(
-        this.getTitleDOM_(isSearchResult));
-
-    if (focusless)
-      title.querySelector('a').tabIndex = -1;
-
-    visitEntryWrapper.appendChild(domain);
-  }
-
-  if (isMobileVersion()) {
-    if (this.model_.editingEntriesAllowed) {
-      var removeButton = createElementWithClassName('button', 'remove-entry');
-      removeButton.setAttribute('aria-label',
-                                loadTimeData.getString('removeFromHistory'));
-      removeButton.classList.add('custom-appearance');
-      removeButton.addEventListener(
-          'click', this.removeEntryFromHistory_.bind(this));
-      entryBox.appendChild(removeButton);
-
-      // Support clicking anywhere inside the entry box.
-      entryBox.addEventListener('click', function(e) {
-        if (!e.defaultPrevented) {
-          self.titleLink.focus();
-          self.titleLink.click();
-        }
-      });
-    }
-  } else {
-    var dropDown = createElementWithClassName('button', 'drop-down');
-    dropDown.value = 'Open action menu';
-    dropDown.title = loadTimeData.getString('actionMenuDescription');
-    dropDown.setAttribute('menu', '#action-menu');
-    dropDown.setAttribute('aria-haspopup', 'true');
-
-    if (focusless)
-      dropDown.tabIndex = -1;
-
-    cr.ui.decorate(dropDown, cr.ui.MenuButton);
-    dropDown.respondToArrowKeys = false;
-
-    dropDown.addEventListener('mousedown', setActiveVisit);
-    dropDown.addEventListener('focus', setActiveVisit);
-
-    // Prevent clicks on the drop down from affecting the checkbox.  We need to
-    // call blur() explicitly because preventDefault() cancels any focus
-    // handling.
-    dropDown.addEventListener('click', function(e) {
-      e.preventDefault();
-      document.activeElement.blur();
-    });
-    entryBox.appendChild(dropDown);
-  }
-
-  // Let the entryBox be styled appropriately when it contains keyboard focus.
-  entryBox.addEventListener('focus', function() {
-    this.classList.add('contains-focus');
-  }, true);
-  entryBox.addEventListener('blur', function() {
-    this.classList.remove('contains-focus');
-  }, true);
-
-  var entryBoxContainer =
-      createElementWithClassName('div', 'entry-box-container');
-  node.appendChild(entryBoxContainer);
-  entryBoxContainer.appendChild(entryBox);
-
-  if (isSearchResult || useMonthDate) {
-    // Show the day instead of the time.
-    time.appendChild(document.createTextNode(this.dateShort));
-  } else {
-    time.appendChild(document.createTextNode(this.dateTimeOfDay));
-  }
-
-  this.domNode_ = node;
-  node.visit = this;
-
-  return node;
-};
-
-/**
- * Remove this visit from the history.
- */
-Visit.prototype.removeFromHistory = function() {
-  recordUmaAction('HistoryPage_EntryMenuRemoveFromHistory');
-  this.model_.removeVisitsFromHistory([this], function() {
-    this.model_.getView().removeVisit(this);
-  }.bind(this));
-};
-
-// Closure Compiler doesn't support Object.defineProperty().
-// https://github.com/google/closure-compiler/issues/302
-Object.defineProperty(Visit.prototype, 'checkBox', {
-  get: /** @this {Visit} */function() {
-    return this.domNode_.querySelector('input[type=checkbox]');
-  },
-});
-
-Object.defineProperty(Visit.prototype, 'bookmarkStar', {
-  get: /** @this {Visit} */function() {
-    return this.domNode_.querySelector('.bookmark-section.starred');
-  },
-});
-
-Object.defineProperty(Visit.prototype, 'titleLink', {
-  get: /** @this {Visit} */function() {
-    return this.domNode_.querySelector('.title a');
-  },
-});
-
-Object.defineProperty(Visit.prototype, 'dropDown', {
-  get: /** @this {Visit} */function() {
-    return this.domNode_.querySelector('button.drop-down');
-  },
-});
-
-// Visit, private: ------------------------------------------------------------
-
-/**
- * Add child text nodes to a node such that occurrences of the specified text is
- * highlighted.
- * @param {Node} node The node under which new text nodes will be made as
- *     children.
- * @param {string} content Text to be added beneath |node| as one or more
- *     text nodes.
- * @param {string} highlightText Occurences of this text inside |content| will
- *     be highlighted.
- * @private
- */
-Visit.prototype.addHighlightedText_ = function(node, content, highlightText) {
-  var i = 0;
-  if (highlightText) {
-    var re = new RegExp(quoteString(highlightText), 'gim');
-    var match;
-    while (match = re.exec(content)) {
-      if (match.index > i)
-        node.appendChild(document.createTextNode(content.slice(i,
-                                                               match.index)));
-      i = re.lastIndex;
-      // Mark the highlighted text in bold.
-      var b = document.createElement('b');
-      b.textContent = content.substring(match.index, i);
-      node.appendChild(b);
-    }
-  }
-  if (i < content.length)
-    node.appendChild(document.createTextNode(content.slice(i)));
-};
-
-/**
- * Returns the DOM element containing a link on the title of the URL for the
- * current visit.
- * @param {boolean} isSearchResult Whether or not the entry is a search result.
- * @return {Element} DOM representation for the title block.
- * @private
- */
-Visit.prototype.getTitleDOM_ = function(isSearchResult) {
-  var node = createElementWithClassName('div', 'title');
-  var link = document.createElement('a');
-  link.href = this.url_;
-  link.id = 'id-' + this.id_;
-  link.target = '_top';
-  var integerId = parseInt(this.id_, 10);
-  link.addEventListener('click', function() {
-    recordUmaAction('HistoryPage_EntryLinkClick');
-    // Record the ID of the entry to signify how many entries are above this
-    // link on the page.
-    recordUmaHistogram('HistoryPage.ClickPosition',
-                       UMA_MAX_BUCKET_VALUE,
-                       integerId);
-    if (integerId <= UMA_MAX_SUBSET_BUCKET_VALUE) {
-      recordUmaHistogram('HistoryPage.ClickPositionSubset',
-                         UMA_MAX_SUBSET_BUCKET_VALUE,
-                         integerId);
-    }
-  });
-  link.addEventListener('contextmenu', function() {
-    recordUmaAction('HistoryPage_EntryLinkRightClick');
-  });
-
-  if (isSearchResult) {
-    link.addEventListener('click', function() {
-      recordUmaAction('HistoryPage_SearchResultClick');
-    });
-  }
-
-  // Add a tooltip, since it might be ellipsized.
-  // TODO(dubroy): Find a way to show the tooltip only when necessary.
-  link.title = this.title_;
-
-  this.addHighlightedText_(link, this.title_, this.model_.getSearchText());
-  node.appendChild(link);
-
-  return node;
-};
-
-/**
- * Returns the DOM element containing the text for a blocked visit attempt.
- * @return {Element} DOM representation of the visit attempt.
- * @private
- */
-Visit.prototype.getVisitAttemptDOM_ = function() {
-  var node = createElementWithClassName('div', 'title');
-  node.innerHTML = loadTimeData.getStringF('blockedVisitText',
-                                           this.url_,
-                                           this.id_,
-                                           this.domain_);
-  return node;
-};
-
-/**
- * Load the favicon for an element.
- * @param {Element} faviconDiv The DOM element for which to load the icon.
- * @private
- */
-Visit.prototype.loadFavicon_ = function(faviconDiv) {
-  if (cr.isAndroid) {
-    // On Android, if a large icon is unavailable, an HTML/CSS  fallback favicon
-    // is generated because Android does not yet support text drawing in native.
-
-    // Check whether a fallback favicon needs to be generated.
-    var desiredPixelSize = 32 * window.devicePixelRatio;
-    var img = new Image();
-    img.onload = this.onLargeFaviconLoadedAndroid_.bind(this, faviconDiv);
-    img.src = 'chrome://large-icon/' + desiredPixelSize + '/' + this.url_;
-  } else {
-    faviconDiv.style.backgroundImage = cr.icon.getFavicon(this.url_);
-  }
-};
-
-/**
- * Called when the chrome://large-icon image has finished loading.
- * @param {Element} faviconDiv The DOM element to add the favicon to.
- * @param {Event} event The onload event.
- * @private
- */
-Visit.prototype.onLargeFaviconLoadedAndroid_ = function(faviconDiv, event) {
-  // The loaded image should either:
-  // - Have the desired size.
-  // OR
-  // - Be 1x1 px with the background color for the fallback icon.
-  var loadedImg = event.target;
-  if (loadedImg.width == 1) {
-    faviconDiv.classList.add('fallback-favicon');
-    faviconDiv.textContent = this.fallbackFaviconText_;
-  }
-  faviconDiv.style.backgroundImage = url(loadedImg.src);
-};
-
-/**
- * Launch a search for more history entries from the same domain.
- * @private
- */
-Visit.prototype.showMoreFromSite_ = function() {
-  recordUmaAction('HistoryPage_EntryMenuShowMoreFromSite');
-  historyView.setSearch(this.domain_);
-  $('search-field').focus();
-};
-
-/**
- * @param {Event} e A keydown event to handle.
- * @private
- */
-Visit.prototype.handleKeydown_ = function(e) {
-  // Delete or Backspace should delete the entry if allowed.
-  if (e.key == 'Backspace' || e.key == 'Delete')
-    this.removeEntryFromHistory_(e);
-};
-
-/**
- * @param {Event} event A mousedown event.
- * @private
- */
-Visit.prototype.handleMousedown_ = function(event) {
-  // Prevent text selection when shift-clicking to select multiple entries.
-  if (event.shiftKey) {
-    event.preventDefault();
-
-    var target = assertInstanceof(event.target, HTMLElement);
-    if (this.model_.getView().isInFocusGrid(target))
-      target.focus();
-  }
-};
-
-/**
- * Removes a history entry on click or keydown and finds a new entry to focus.
- * @param {Event} e A click or keydown event.
- * @private
- */
-Visit.prototype.removeEntryFromHistory_ = function(e) {
-  if (!this.model_.deletingHistoryAllowed || this.model_.isDeletingVisits() ||
-      this.domNode_.classList.contains('fade-out')) {
-    return;
-  }
-
-  this.model_.getView().onBeforeRemove(this);
-  this.removeFromHistory();
-  e.preventDefault();
-};
-
-///////////////////////////////////////////////////////////////////////////////
-// HistoryModel:
-
-/**
- * Global container for history data. Future optimizations might include
- * allowing the creation of a HistoryModel for each search string, allowing
- * quick flips back and forth between results.
- *
- * The history model is based around pages, and only fetching the data to
- * fill the currently requested page. This is somewhat dependent on the view,
- * and so future work may wish to change history model to operate on
- * timeframe (day or week) based containers.
- *
- * @constructor
- */
-function HistoryModel() {
-  this.clearModel_();
-}
-
-// HistoryModel, Public: ------------------------------------------------------
-
-/** @enum {number} */
-HistoryModel.Range = {
-  ALL_TIME: 0,
-  WEEK: 1,
-  MONTH: 2
-};
-
-/**
- * Sets our current view that is called when the history model changes.
- * @param {HistoryView} view The view to set our current view to.
- */
-HistoryModel.prototype.setView = function(view) {
-  this.view_ = view;
-};
-
-
-/**
- * @return {HistoryView|undefined} Returns the view for this model (if set).
- */
-HistoryModel.prototype.getView = function() {
-  return this.view_;
-};
-
-/**
- * Reload our model with the current parameters.
- */
-HistoryModel.prototype.reload = function() {
-  // Save user-visible state, clear the model, and restore the state.
-  var search = this.searchText_;
-  var page = this.requestedPage_;
-  var range = this.rangeInDays_;
-  var offset = this.offset_;
-  var groupByDomain = this.groupByDomain_;
-
-  this.clearModel_();
-  this.searchText_ = search;
-  this.requestedPage_ = page;
-  this.rangeInDays_ = range;
-  this.offset_ = offset;
-  this.groupByDomain_ = groupByDomain;
-  this.queryHistory_();
-};
-
-/**
- * @return {string} The current search text.
- */
-HistoryModel.prototype.getSearchText = function() {
-  return this.searchText_;
-};
-
-/**
- * Tell the model that the view will want to see the current page. When
- * the data becomes available, the model will call the view back.
- * @param {number} page The page we want to view.
- */
-HistoryModel.prototype.requestPage = function(page) {
-  this.requestedPage_ = page;
-  this.updateSearch_();
-};
-
-/**
- * Receiver for history query.
- * @param {HistoryQuery} info An object containing information about the query.
- * @param {Array<HistoryEntry>} results A list of results.
- */
-HistoryModel.prototype.addResults = function(info, results) {
-  // If no requests are in flight then this was an old request so we drop the
-  // results. Double check the search term as well.
-  if (!this.inFlight_ || info.term != this.searchText_)
-    return;
-
-  $('loading-spinner').hidden = true;
-  this.inFlight_ = false;
-  this.isQueryFinished_ = info.finished;
-  this.queryInterval = info.queryInterval;
-
-  var lastVisit = this.visits_.slice(-1)[0];
-  var lastDay = lastVisit ? lastVisit.dateRelativeDay : null;
-
-  for (var i = 0, result; result = results[i]; i++) {
-    var thisDay = result.dateRelativeDay;
-    var isSameDay = lastDay == thisDay;
-    this.visits_.push(new Visit(result, isSameDay, this));
-    lastDay = thisDay;
-  }
-
-  this.updateSearch_();
-};
-
-/**
- * @return {number} The number of visits in the model.
- */
-HistoryModel.prototype.getSize = function() {
-  return this.visits_.length;
-};
-
-/**
- * Get a list of visits between specified index positions.
- * @param {number} start The start index.
- * @param {number} end The end index.
- * @return {Array<Visit>} A list of visits.
- */
-HistoryModel.prototype.getNumberedRange = function(start, end) {
-  return this.visits_.slice(start, end);
-};
-
-/**
- * Return true if there are more results beyond the current page.
- * @return {boolean} true if the there are more results, otherwise false.
- */
-HistoryModel.prototype.hasMoreResults = function() {
-  return this.haveDataForPage_(this.requestedPage_ + 1) ||
-      !this.isQueryFinished_;
-};
-
-/**
- * Removes a list of visits from the history, and calls |callback| when the
- * removal has successfully completed.
- * @param {Array<Visit>} visits The visits to remove.
- * @param {Function} callback The function to call after removal succeeds.
- */
-HistoryModel.prototype.removeVisitsFromHistory = function(visits, callback) {
-  assert(this.deletingHistoryAllowed);
-
-  var toBeRemoved = [];
-  for (var i = 0; i < visits.length; i++) {
-    toBeRemoved.push({
-      url: visits[i].url_,
-      timestamps: visits[i].allTimestamps
-    });
-  }
-
-  this.deleteCompleteCallback_ = callback;
-  chrome.send('removeVisits', toBeRemoved);
-};
-
-/** @return {boolean} Whether the model is currently deleting a visit. */
-HistoryModel.prototype.isDeletingVisits = function() {
-  return !!this.deleteCompleteCallback_;
-};
-
-/**
- * Called when visits have been succesfully removed from the history.
- */
-HistoryModel.prototype.deleteComplete = function() {
-  // Call the callback, with 'this' undefined inside the callback.
-  this.deleteCompleteCallback_.call();
-  this.deleteCompleteCallback_ = null;
-};
-
-// Getter and setter for HistoryModel.rangeInDays_.
-Object.defineProperty(HistoryModel.prototype, 'rangeInDays', {
-  get: /** @this {HistoryModel} */function() {
-    return this.rangeInDays_;
-  },
-  set: /** @this {HistoryModel} */function(range) {
-    this.rangeInDays_ = range;
-  }
-});
-
-/**
- * Getter and setter for HistoryModel.offset_. The offset moves the current
- * query 'window' |range| days behind. As such for range set to WEEK an offset
- * of 0 refers to the last 7 days, an offset of 1 refers to the 7 day period
- * that ended 7 days ago, etc. For MONTH an offset of 0 refers to the current
- * calendar month, 1 to the previous one, etc.
- */
-Object.defineProperty(HistoryModel.prototype, 'offset', {
-  get: /** @this {HistoryModel} */function() {
-    return this.offset_;
-  },
-  set: /** @this {HistoryModel} */function(offset) {
-    this.offset_ = offset;
-  }
-});
-
-// Setter for HistoryModel.requestedPage_.
-Object.defineProperty(HistoryModel.prototype, 'requestedPage', {
-  set: /** @this {HistoryModel} */function(page) {
-    this.requestedPage_ = page;
-  }
-});
-
-/**
- * Removes |visit| from this model.
- * @param {Visit} visit A visit to remove.
- */
-HistoryModel.prototype.removeVisit = function(visit) {
-  var index = this.visits_.indexOf(visit);
-  if (index >= 0)
-    this.visits_.splice(index, 1);
-};
-
-/**
- * Automatically generates a new visit ID.
- * @return {number} The next visit ID.
- */
-HistoryModel.prototype.getNextVisitId = function() {
-  return this.nextVisitId_++;
-};
-
-// HistoryModel, Private: -----------------------------------------------------
-
-/**
- * Clear the history model.
- * @private
- */
-HistoryModel.prototype.clearModel_ = function() {
-  this.inFlight_ = false;  // Whether a query is inflight.
-  this.searchText_ = '';
-  // Whether this user is a supervised user.
-  this.isSupervisedProfile = loadTimeData.getBoolean('isSupervisedProfile');
-  this.deletingHistoryAllowed = loadTimeData.getBoolean('allowDeletingHistory');
-
-  // Only create checkboxes for editing entries if they can be used either to
-  // delete an entry or to block/allow it.
-  this.editingEntriesAllowed = this.deletingHistoryAllowed;
-
-  // Flag to show that the results are grouped by domain or not.
-  this.groupByDomain_ = false;
-
-  this.visits_ = [];  // Date-sorted list of visits (most recent first).
-  this.nextVisitId_ = 0;
-  selectionAnchor = -1;
-
-  // The page that the view wants to see - we only fetch slightly past this
-  // point. If the view requests a page that we don't have data for, we try
-  // to fetch it and call back when we're done.
-  this.requestedPage_ = 0;
-
-  // The range of history to view or search over.
-  this.rangeInDays_ = HistoryModel.Range.ALL_TIME;
-
-  // Skip |offset_| * weeks/months from the begining.
-  this.offset_ = 0;
-
-  // Keeps track of whether or not there are more results available than are
-  // currently held in |this.visits_|.
-  this.isQueryFinished_ = false;
-
-  if (this.view_)
-    this.view_.clear_();
-};
-
-/**
- * Figure out if we need to do more queries to fill the currently requested
- * page. If we think we can fill the page, call the view and let it know
- * we're ready to show something. This only applies to the daily time-based
- * view.
- * @private
- */
-HistoryModel.prototype.updateSearch_ = function() {
-  var doneLoading = this.rangeInDays_ != HistoryModel.Range.ALL_TIME ||
-                    this.isQueryFinished_ ||
-                    this.canFillPage_(this.requestedPage_);
-
-  // Try to fetch more results if more results can arrive and the page is not
-  // full.
-  if (!doneLoading && !this.inFlight_)
-    this.queryHistory_();
-
-  // Show the result or a message if no results were returned.
-  this.view_.onModelReady(doneLoading);
-};
-
-/**
- * Query for history, either for a search or time-based browsing.
- * @private
- */
-HistoryModel.prototype.queryHistory_ = function() {
-  var maxResults =
-      (this.rangeInDays_ == HistoryModel.Range.ALL_TIME) ? RESULTS_PER_PAGE : 0;
-
-  // If there are already some visits, pick up the previous query where it
-  // left off.
-  var lastVisit = this.visits_.slice(-1)[0];
-  var endTime = lastVisit ? lastVisit.date.getTime() : 0;
-
-  $('loading-spinner').hidden = false;
-  this.inFlight_ = true;
-  chrome.send('queryHistory',
-      [this.searchText_, this.offset_, this.rangeInDays_, endTime, maxResults]);
-};
-
-/**
- * Check to see if we have data for the given page.
- * @param {number} page The page number.
- * @return {boolean} Whether we have any data for the given page.
- * @private
- */
-HistoryModel.prototype.haveDataForPage_ = function(page) {
-  return page * RESULTS_PER_PAGE < this.getSize();
-};
-
-/**
- * Check to see if we have data to fill the given page.
- * @param {number} page The page number.
- * @return {boolean} Whether we have data to fill the page.
- * @private
- */
-HistoryModel.prototype.canFillPage_ = function(page) {
-  return ((page + 1) * RESULTS_PER_PAGE <= this.getSize());
-};
-
-/**
- * Gets whether we are grouped by domain.
- * @return {boolean} Whether the results are grouped by domain.
- */
-HistoryModel.prototype.getGroupByDomain = function() {
-  return this.groupByDomain_;
-};
-
-///////////////////////////////////////////////////////////////////////////////
-// HistoryFocusRow:
-
-/**
- * Provides an implementation for a single column grid.
- * @param {!Element} root
- * @param {?Element} boundary
- * @constructor
- * @extends {cr.ui.FocusRow}
- */
-function HistoryFocusRow(root, boundary) {
-  cr.ui.FocusRow.call(this, root, boundary);
-
-  // None of these are guaranteed to exist in all versions of the UI.
-  this.addItem('checkbox', '.entry-box input');
-  this.addItem('checkbox', '.domain-checkbox');
-  this.addItem('star', '.bookmark-section.starred');
-  this.addItem('domain', '[is="action-link"]');
-  this.addItem('title', '.title a');
-  this.addItem('menu', '.drop-down');
-}
-
-HistoryFocusRow.prototype = {
-  __proto__: cr.ui.FocusRow.prototype,
-
-  /** @override */
-  getCustomEquivalent: function(sampleElement) {
-    var equivalent;
-
-    switch (this.getTypeForElement(sampleElement)) {
-      case 'star':
-        equivalent = this.getFirstFocusable('title') ||
-                     this.getFirstFocusable('domain');
-        break;
-      case 'domain':
-        equivalent = this.getFirstFocusable('title');
-        break;
-      case 'title':
-        equivalent = this.getFirstFocusable('domain');
-        break;
-      case 'menu':
-        equivalent = this.getFocusableElements().slice(-1)[0];
-        break;
-    }
-
-    return equivalent ||
-        cr.ui.FocusRow.prototype.getCustomEquivalent.call(this, sampleElement);
-  },
-};
-
-///////////////////////////////////////////////////////////////////////////////
-// HistoryView:
-
-/**
- * Functions and state for populating the page with HTML. This should one-day
- * contain the view and use event handlers, rather than pushing HTML out and
- * getting called externally.
- * @param {HistoryModel} model The model backing this view.
- * @constructor
- */
-function HistoryView(model) {
-  this.editButtonTd_ = $('edit-button');
-  this.editingControlsDiv_ = $('editing-controls');
-  this.resultDiv_ = $('results-display');
-  this.focusGrid_ = new cr.ui.FocusGrid();
-  this.pageDiv_ = $('results-pagination');
-  this.model_ = model;
-  this.pageIndex_ = 0;
-  this.lastDisplayed_ = [];
-  this.hasRenderedResults_ = false;
-
-  this.model_.setView(this);
-
-  this.currentVisits_ = [];
-
-  // If there is no search button, use the search button label as placeholder
-  // text in the search field.
-  if ($('search-button').offsetWidth == 0)
-    $('search-field').placeholder = $('search-button').value;
-
-  var self = this;
-
-  $('clear-browsing-data').addEventListener('click', openClearBrowsingData);
-  $('remove-selected').addEventListener('click', removeItems);
-
-  // Add handlers for the page navigation buttons at the bottom.
-  $('newest-button').addEventListener('click', function() {
-    recordUmaAction('HistoryPage_NewestHistoryClick');
-    self.setPage(0);
-  });
-  $('newer-button').addEventListener('click', function() {
-    recordUmaAction('HistoryPage_NewerHistoryClick');
-    self.setPage(self.pageIndex_ - 1);
-  });
-  $('older-button').addEventListener('click', function() {
-    recordUmaAction('HistoryPage_OlderHistoryClick');
-    self.setPage(self.pageIndex_ + 1);
-  });
-
-  $('timeframe-controls').onchange = function(e) {
-    var value = parseInt(e.target.value, 10);
-    self.setRangeInDays(/** @type {HistoryModel.Range<number>} */(value));
-  };
-
-  $('range-previous').addEventListener('click', function(e) {
-    if (self.getRangeInDays() == HistoryModel.Range.ALL_TIME)
-      self.setPage(self.pageIndex_ + 1);
-    else
-      self.setOffset(self.getOffset() + 1);
-  });
-  $('range-next').addEventListener('click', function(e) {
-    if (self.getRangeInDays() == HistoryModel.Range.ALL_TIME)
-      self.setPage(self.pageIndex_ - 1);
-    else
-      self.setOffset(self.getOffset() - 1);
-  });
-  $('range-today').addEventListener('click', function(e) {
-    if (self.getRangeInDays() == HistoryModel.Range.ALL_TIME)
-      self.setPage(0);
-    else
-      self.setOffset(0);
-  });
-}
-
-// HistoryView, public: -------------------------------------------------------
-/**
- * Do a search on a specific term.
- * @param {string} term The string to search for.
- */
-HistoryView.prototype.setSearch = function(term) {
-  window.scrollTo(0, 0);
-  this.setPageState(term, 0, this.getRangeInDays(), this.getOffset());
-};
-
-/**
- * Reload the current view.
- */
-HistoryView.prototype.reload = function() {
-  this.model_.reload();
-  this.updateSelectionEditButtons();
-  this.updateRangeButtons_();
-};
-
-/**
- * Sets all the parameters for the history page and then reloads the view to
- * update the results.
- * @param {string} searchText The search string to set.
- * @param {number} page The page to be viewed.
- * @param {HistoryModel.Range} range The range to view or search over.
- * @param {number} offset Set the begining of the query to the specific offset.
- */
-HistoryView.prototype.setPageState = function(searchText, page, range, offset) {
-  this.clear_();
-  this.model_.searchText_ = searchText;
-  this.pageIndex_ = page;
-  this.model_.requestedPage_ = page;
-  this.model_.rangeInDays_ = range;
-  this.model_.groupByDomain_ = false;
-  if (range != HistoryModel.Range.ALL_TIME)
-    this.model_.groupByDomain_ = true;
-  this.model_.offset_ = offset;
-  this.reload();
-  pageState.setUIState(this.model_.getSearchText(),
-                       this.pageIndex_,
-                       this.getRangeInDays(),
-                       this.getOffset());
-};
-
-/**
- * Switch to a specified page.
- * @param {number} page The page we wish to view.
- */
-HistoryView.prototype.setPage = function(page) {
-  // TODO(sergiu): Move this function to setPageState as well and see why one
-  // of the tests fails when using setPageState.
-  this.clear_();
-  this.pageIndex_ = parseInt(page, 10);
-  window.scrollTo(0, 0);
-  this.model_.requestPage(page);
-  pageState.setUIState(this.model_.getSearchText(),
-                       this.pageIndex_,
-                       this.getRangeInDays(),
-                       this.getOffset());
-};
-
-/**
- * @return {number} The page number being viewed.
- */
-HistoryView.prototype.getPage = function() {
-  return this.pageIndex_;
-};
-
-/**
- * Set the current range for grouped results.
- * @param {HistoryModel.Range} range The number of days to which the range
- *     should be set.
- */
-HistoryView.prototype.setRangeInDays = function(range) {
-  // Set the range, offset and reset the page.
-  this.setPageState(this.model_.getSearchText(), 0, range, 0);
-};
-
-/**
- * Get the current range in days.
- * @return {HistoryModel.Range} Current range in days from the model.
- */
-HistoryView.prototype.getRangeInDays = function() {
-  return this.model_.rangeInDays;
-};
-
-/**
- * Set the current offset for grouped results.
- * @param {number} offset Offset to set.
- */
-HistoryView.prototype.setOffset = function(offset) {
-  // If there is another query already in flight wait for that to complete.
-  if (this.model_.inFlight_)
-    return;
-  this.setPageState(this.model_.getSearchText(),
-                    this.pageIndex_,
-                    this.getRangeInDays(),
-                    offset);
-};
-
-/**
- * Get the current offset.
- * @return {number} Current offset from the model.
- */
-HistoryView.prototype.getOffset = function() {
-  return this.model_.offset;
-};
-
-/**
- * Callback for the history model to let it know that it has data ready for us
- * to view.
- * @param {boolean} doneLoading Whether the current request is complete.
- */
-HistoryView.prototype.onModelReady = function(doneLoading) {
-  this.displayResults_(doneLoading);
-
-  // Allow custom styling based on whether there are any results on the page.
-  // To make this easier, add a class to the body if there are any results.
-  var hasResults = this.model_.visits_.length > 0;
-  document.body.classList.toggle('has-results', hasResults);
-
-  this.updateFocusGrid_();
-  this.updateNavBar_();
-
-  if (isMobileVersion()) {
-    // Hide the search field if it is empty and there are no results.
-    var isSearch = this.model_.getSearchText().length > 0;
-    $('search-field').hidden = !(hasResults || isSearch);
-  }
-
-  if (!this.hasRenderedResults_) {
-    this.hasRenderedResults_ = true;
-    setTimeout(function() {
-      chrome.send(
-          'metricsHandler:recordTime',
-          ['History.ResultsRenderedTime', window.performance.now()]);
-    });
-  }
-};
-
-/**
- * Enables or disables the buttons that control editing entries depending on
- * whether there are any checked boxes.
- */
-HistoryView.prototype.updateSelectionEditButtons = function() {
-  if (loadTimeData.getBoolean('allowDeletingHistory')) {
-    var anyChecked = document.querySelector('.entry input:checked') != null;
-    $('remove-selected').disabled = !anyChecked;
-  } else {
-    $('remove-selected').disabled = true;
-  }
-};
-
-/**
- * Shows the notification bar at the top of the page with |innerHTML| as its
- * content.
- * @param {string} innerHTML The HTML content of the warning.
- * @param {boolean} isWarning If true, style the notification as a warning.
- */
-HistoryView.prototype.showNotification = function(innerHTML, isWarning) {
-  var bar = $('notification-bar');
-  bar.innerHTML = innerHTML;
-  bar.hidden = false;
-  if (isWarning)
-    bar.classList.add('warning');
-  else
-    bar.classList.remove('warning');
-
-  // Make sure that any links in the HTML are targeting the top level.
-  var links = bar.querySelectorAll('a');
-  for (var i = 0; i < links.length; i++)
-    links[i].target = '_top';
-
-  this.positionNotificationBar();
-};
-
-/**
- * Shows a notification about whether there are any synced results, and whether
- * there are other forms of browsing history on the server.
- * @param {boolean} hasSyncedResults Whether there are synced results.
- * @param {boolean} includeOtherFormsOfBrowsingHistory Whether to include
- *     a sentence about the existence of other forms of browsing history.
- */
-HistoryView.prototype.showWebHistoryNotification = function(
-    hasSyncedResults, includeOtherFormsOfBrowsingHistory) {
-  var message = '';
-
-  if (loadTimeData.getBoolean('isUserSignedIn')) {
-    message += '<span>' + loadTimeData.getString(
-        hasSyncedResults ? 'hasSyncedResults' : 'noSyncedResults') + '</span>';
-  }
-
-  if (includeOtherFormsOfBrowsingHistory) {
-    message += ' ' /* A whitespace to separate <span>s. */ + '<span>' +
-        loadTimeData.getString('otherFormsOfBrowsingHistory') + '</span>';
-  }
-
-  if (message)
-    this.showNotification(message, false /* isWarning */);
-};
-
-/**
- * @param {Visit} visit The visit about to be removed from this view.
- */
-HistoryView.prototype.onBeforeRemove = function(visit) {
-  assert(this.currentVisits_.indexOf(visit) >= 0);
-
-  var rowIndex = this.focusGrid_.getRowIndexForTarget(document.activeElement);
-  if (rowIndex == -1)
-    return;
-
-  var rowToFocus = this.focusGrid_.rows[rowIndex + 1] ||
-                   this.focusGrid_.rows[rowIndex - 1];
-  if (rowToFocus)
-    rowToFocus.getEquivalentElement(document.activeElement).focus();
-};
-
-/** @param {Visit} visit The visit about to be unstarred. */
-HistoryView.prototype.onBeforeUnstarred = function(visit) {
-  assert(this.currentVisits_.indexOf(visit) >= 0);
-  assert(visit.bookmarkStar == document.activeElement);
-
-  var rowIndex = this.focusGrid_.getRowIndexForTarget(document.activeElement);
-  var row = this.focusGrid_.rows[rowIndex];
-
-  // Focus the title or domain when the bookmarked star is removed because the
-  // star will no longer be focusable.
-  row.root.querySelector('[focus-type=title], [focus-type=domain]').focus();
-};
-
-/** @param {Visit} visit The visit that was just unstarred. */
-HistoryView.prototype.onAfterUnstarred = function(visit) {
-  this.updateFocusGrid_();
-};
-
-/**
- * Removes a single entry from the view. Also removes gaps before and after
- * entry if necessary.
- * @param {Visit} visit The visit to be removed.
- */
-HistoryView.prototype.removeVisit = function(visit) {
-  var entry = visit.domNode_;
-  var previousEntry = entry.previousSibling;
-  var nextEntry = entry.nextSibling;
-  var toRemove = [entry];
-
-  // If there is no previous entry, and the next entry is a gap, remove it.
-  if (!previousEntry && nextEntry && nextEntry.classList.contains('gap'))
-    toRemove.push(nextEntry);
-
-  // If there is no next entry, and the previous entry is a gap, remove it.
-  if (!nextEntry && previousEntry && previousEntry.classList.contains('gap'))
-    toRemove.push(previousEntry);
-
-  // If both the next and previous entries are gaps, remove the next one.
-  if (nextEntry && nextEntry.classList.contains('gap') &&
-      previousEntry && previousEntry.classList.contains('gap')) {
-    toRemove.push(nextEntry);
-  }
-
-  // If removing the last entry on a day, remove the entire day.
-  var dayResults = findAncestorByClass(entry, 'day-results');
-  if (dayResults && dayResults.querySelectorAll('.entry').length <= 1) {
-    toRemove.push(dayResults.previousSibling);  // Remove the 'h3'.
-    toRemove.push(dayResults);
-  }
-
-  // Callback to be called when each node has finished animating. It detects
-  // when all the animations have completed.
-  function onRemove() {
-    for (var i = 0; i < toRemove.length; ++i) {
-      if (toRemove[i].parentNode)
-        return;
-    }
-    onEntryRemoved();
-  }
-
-  // Kick off the removal process.
-  for (var i = 0; i < toRemove.length; ++i) {
-    removeNode(toRemove[i], onRemove, this);
-  }
-  this.updateFocusGrid_();
-
-  var index = this.currentVisits_.indexOf(visit);
-  if (index >= 0)
-    this.currentVisits_.splice(index, 1);
-
-  this.model_.removeVisit(visit);
-};
-
-/**
- * Called when an individual history entry has been removed from the page.
- * This will only be called when all the elements affected by the deletion
- * have been removed from the DOM and the animations have completed.
- */
-HistoryView.prototype.onEntryRemoved = function() {
-  this.updateSelectionEditButtons();
-
-  if (this.model_.getSize() == 0) {
-    this.clear_();
-    this.onModelReady(true);  // Shows "No entries" message.
-  }
-};
-
-/**
- * Adjusts the position of the notification bar based on the size of the page.
- */
-HistoryView.prototype.positionNotificationBar = function() {
-  var bar = $('notification-bar');
-  var container = $('top-container');
-
-  // If the bar does not fit beside the editing controls, or if it contains
-  // more than one message, put it into the overflow state.
-  var shouldOverflow =
-      (bar.getBoundingClientRect().top >=
-           $('editing-controls').getBoundingClientRect().bottom) ||
-      bar.childElementCount > 1;
-  container.classList.toggle('overflow', shouldOverflow);
-};
-
-/**
- * @param {!Element} el An element to look for.
- * @return {boolean} Whether |el| is in |this.focusGrid_|.
- */
-HistoryView.prototype.isInFocusGrid = function(el) {
-  return this.focusGrid_.getRowIndexForTarget(el) != -1;
-};
-
-// HistoryView, private: ------------------------------------------------------
-
-/**
- * Clear the results in the view.  Since we add results piecemeal, we need
- * to clear them out when we switch to a new page or reload.
- * @private
- */
-HistoryView.prototype.clear_ = function() {
-  var alertOverlay = $('alertOverlay');
-  if (alertOverlay && alertOverlay.classList.contains('showing'))
-    hideConfirmationOverlay();
-
-  // Remove everything but <h3 id="results-header"> (the first child).
-  while (this.resultDiv_.children.length > 1) {
-    this.resultDiv_.removeChild(this.resultDiv_.lastElementChild);
-  }
-  $('results-header').textContent = '';
-
-  this.currentVisits_.forEach(function(visit) {
-    visit.isRendered = false;
-  });
-  this.currentVisits_ = [];
-
-  document.body.classList.remove('has-results');
-};
-
-/**
- * Record that the given visit has been rendered.
- * @param {Visit} visit The visit that was rendered.
- * @private
- */
-HistoryView.prototype.setVisitRendered_ = function(visit) {
-  visit.isRendered = true;
-  this.currentVisits_.push(visit);
-};
-
-/**
- * Generates and adds the grouped visits DOM for a certain domain. This
- * includes the clickable arrow and domain name and the visit entries for
- * that domain.
- * @param {Element} results DOM object to which to add the elements.
- * @param {string} domain Current domain name.
- * @param {Array} domainVisits Array of visits for this domain.
- * @private
- */
-HistoryView.prototype.getGroupedVisitsDOM_ = function(
-    results, domain, domainVisits) {
-  // Add a new domain entry.
-  var siteResults = results.appendChild(
-      createElementWithClassName('li', 'site-entry'));
-
-  var siteDomainWrapper = siteResults.appendChild(
-      createElementWithClassName('div', 'site-domain-wrapper'));
-  // Make a row that will contain the arrow, the favicon and the domain.
-  var siteDomainRow = siteDomainWrapper.appendChild(
-      createElementWithClassName('div', 'site-domain-row'));
-
-  if (this.model_.editingEntriesAllowed) {
-    var siteDomainCheckbox =
-        createElementWithClassName('input', 'domain-checkbox');
-
-    siteDomainCheckbox.type = 'checkbox';
-    siteDomainCheckbox.addEventListener('click', domainCheckboxClicked);
-    siteDomainCheckbox.domain_ = domain;
-    siteDomainCheckbox.setAttribute('aria-label', domain);
-    siteDomainRow.appendChild(siteDomainCheckbox);
-  }
-
-  var siteArrow = siteDomainRow.appendChild(
-      createElementWithClassName('div', 'site-domain-arrow'));
-  var siteFavicon = siteDomainRow.appendChild(
-      createElementWithClassName('div', 'favicon'));
-  var siteDomain = siteDomainRow.appendChild(
-      createElementWithClassName('div', 'site-domain'));
-  var siteDomainLink = siteDomain.appendChild(new ActionLink);
-  siteDomainLink.textContent = domain;
-  var numberOfVisits = createElementWithClassName('span', 'number-visits');
-  var domainElement = document.createElement('span');
-
-  numberOfVisits.textContent =
-      loadTimeData.getStringF('numberVisits',
-                              domainVisits.length.toLocaleString());
-  siteDomain.appendChild(numberOfVisits);
-
-  domainVisits[0].loadFavicon_(siteFavicon);
-
-  siteDomainWrapper.addEventListener(
-      'click', this.toggleGroupedVisits_.bind(this));
-
-  if (this.model_.isSupervisedProfile) {
-    siteDomainRow.appendChild(
-        getFilteringStatusDOM(domainVisits[0].hostFilteringBehavior));
-  }
-
-  siteResults.appendChild(siteDomainWrapper);
-  var resultsList = siteResults.appendChild(
-      createElementWithClassName('ol', 'site-results'));
-  resultsList.classList.add('grouped');
-
-  // Collapse until it gets toggled.
-  resultsList.style.height = 0;
-  resultsList.setAttribute('aria-hidden', 'true');
-
-  // Add the results for each of the domain.
-  var isMonthGroupedResult = this.getRangeInDays() == HistoryModel.Range.MONTH;
-  for (var j = 0, visit; visit = domainVisits[j]; j++) {
-    resultsList.appendChild(visit.getResultDOM({
-      focusless: true,
-      useMonthDate: isMonthGroupedResult,
-    }));
-    this.setVisitRendered_(visit);
-  }
-};
-
-/**
- * Enables or disables the time range buttons.
- * @private
- */
-HistoryView.prototype.updateRangeButtons_ = function() {
-  // The enabled state for the previous, today and next buttons.
-  var previousState = false;
-  var todayState = false;
-  var nextState = false;
-  var usePage = (this.getRangeInDays() == HistoryModel.Range.ALL_TIME);
-
-  // Use pagination for most recent visits, offset otherwise.
-  // TODO(sergiu): Maybe send just one variable in the future.
-  if (usePage) {
-    if (this.getPage() != 0) {
-      nextState = true;
-      todayState = true;
-    }
-    previousState = this.model_.hasMoreResults();
-  } else {
-    if (this.getOffset() != 0) {
-      nextState = true;
-      todayState = true;
-    }
-    previousState = !this.model_.isQueryFinished_;
-  }
-
-  $('range-previous').disabled = !previousState;
-  $('range-today').disabled = !todayState;
-  $('range-next').disabled = !nextState;
-};
-
-/**
- * Groups visits by domain, sorting them by the number of visits.
- * @param {Array} visits Visits received from the query results.
- * @param {Element} results Object where the results are added to.
- * @private
- */
-HistoryView.prototype.groupVisitsByDomain_ = function(visits, results) {
-  var visitsByDomain = {};
-  var domains = [];
-
-  // Group the visits into a dictionary and generate a list of domains.
-  for (var i = 0, visit; visit = visits[i]; i++) {
-    var domain = visit.domain_;
-    if (!visitsByDomain[domain]) {
-      visitsByDomain[domain] = [];
-      domains.push(domain);
-    }
-    visitsByDomain[domain].push(visit);
-  }
-  var sortByVisits = function(a, b) {
-    return visitsByDomain[b].length - visitsByDomain[a].length;
-  };
-  domains.sort(sortByVisits);
-
-  for (var i = 0; i < domains.length; ++i) {
-    var domain = domains[i];
-    this.getGroupedVisitsDOM_(results, domain, visitsByDomain[domain]);
-  }
-};
-
-/**
- * Adds the results for a month.
- * @param {Array} visits Visits returned by the query.
- * @param {Node} parentNode Node to which to add the results to.
- * @private
- */
-HistoryView.prototype.addMonthResults_ = function(visits, parentNode) {
-  if (visits.length == 0)
-    return;
-
-  var monthResults = /** @type {HTMLOListElement} */(parentNode.appendChild(
-      createElementWithClassName('ol', 'month-results')));
-  // Don't add checkboxes if entries can not be edited.
-  if (!this.model_.editingEntriesAllowed)
-    monthResults.classList.add('no-checkboxes');
-
-  this.groupVisitsByDomain_(visits, monthResults);
-};
-
-/**
- * Adds the results for a certain day. This includes a title with the day of
- * the results and the results themselves, grouped or not.
- * @param {Array} visits Visits returned by the query.
- * @param {Node} parentNode Node to which to add the results to.
- * @private
- */
-HistoryView.prototype.addDayResults_ = function(visits, parentNode) {
-  if (visits.length == 0)
-    return;
-
-  var firstVisit = visits[0];
-  var day = parentNode.appendChild(createElementWithClassName('h3', 'day'));
-  day.appendChild(document.createTextNode(firstVisit.dateRelativeDay));
-  if (firstVisit.continued) {
-    day.appendChild(document.createTextNode(' ' +
-                                            loadTimeData.getString('cont')));
-  }
-  var dayResults = /** @type {HTMLElement} */(parentNode.appendChild(
-      createElementWithClassName('ol', 'day-results')));
-
-  // Don't add checkboxes if entries can not be edited.
-  if (!this.model_.editingEntriesAllowed)
-    dayResults.classList.add('no-checkboxes');
-
-  if (this.model_.getGroupByDomain()) {
-    this.groupVisitsByDomain_(visits, dayResults);
-  } else {
-    var lastTime;
-
-    for (var i = 0, visit; visit = visits[i]; i++) {
-      // If enough time has passed between visits, indicate a gap in browsing.
-      var thisTime = visit.date.getTime();
-      if (lastTime && lastTime - thisTime > BROWSING_GAP_TIME)
-        dayResults.appendChild(createElementWithClassName('li', 'gap'));
-
-      // Insert the visit into the DOM.
-      dayResults.appendChild(visit.getResultDOM({ addTitleFavicon: true }));
-      this.setVisitRendered_(visit);
-
-      lastTime = thisTime;
-    }
-  }
-};
-
-/**
- * Adds the text that shows the current interval, used for week and month
- * results.
- * @param {Node} resultsFragment The element to which the interval will be
- *     added to.
- * @private
- */
-HistoryView.prototype.addTimeframeInterval_ = function(resultsFragment) {
-  if (this.getRangeInDays() == HistoryModel.Range.ALL_TIME)
-    return;
-
-  // If this is a time range result add some text that shows what is the
-  // time range for the results the user is viewing.
-  var timeFrame = resultsFragment.appendChild(
-      createElementWithClassName('h2', 'timeframe'));
-  // TODO(sergiu): Figure the best way to show this for the first day of
-  // the month.
-  timeFrame.appendChild(
-      document.createTextNode(this.model_.queryInterval));
-};
-
-/**
- * Update the page with results.
- * @param {boolean} doneLoading Whether the current request is complete.
- * @private
- */
-HistoryView.prototype.displayResults_ = function(doneLoading) {
-  // Either show a page of results received for the all time results or all the
-  // received results for the weekly and monthly view.
-  var results = this.model_.visits_;
-  if (this.getRangeInDays() == HistoryModel.Range.ALL_TIME) {
-    var rangeStart = this.pageIndex_ * RESULTS_PER_PAGE;
-    var rangeEnd = rangeStart + RESULTS_PER_PAGE;
-    results = this.model_.getNumberedRange(rangeStart, rangeEnd);
-  }
-  var searchText = this.model_.getSearchText();
-  var groupByDomain = this.model_.getGroupByDomain();
-
-  if (searchText) {
-    var headerText;
-    if (!doneLoading) {
-      headerText = loadTimeData.getStringF('searchResultsFor', searchText);
-    } else if (results.length == 0) {
-      headerText = loadTimeData.getString('noSearchResults');
-    } else {
-      var resultId = results.length == 1 ? 'searchResult' : 'searchResults';
-      headerText = loadTimeData.getStringF('foundSearchResults',
-                                           results.length,
-                                           loadTimeData.getString(resultId),
-                                           searchText);
-    }
-    $('results-header').textContent = headerText;
-
-    this.addTimeframeInterval_(this.resultDiv_);
-
-    var searchResults = createElementWithClassName('ol', 'search-results');
-
-    // Don't add checkboxes if entries can not be edited.
-    if (!this.model_.editingEntriesAllowed)
-      searchResults.classList.add('no-checkboxes');
-
-    if (doneLoading) {
-      for (var i = 0, visit; visit = results[i]; i++) {
-        if (!visit.isRendered) {
-          searchResults.appendChild(visit.getResultDOM({
-            isSearchResult: true,
-            addTitleFavicon: true
-          }));
-          this.setVisitRendered_(visit);
-        }
-      }
-    }
-    this.resultDiv_.appendChild(searchResults);
-  } else {
-    var resultsFragment = document.createDocumentFragment();
-
-    this.addTimeframeInterval_(resultsFragment);
-
-    var noResults = results.length == 0 && doneLoading;
-    $('results-header').textContent = noResults ?
-        loadTimeData.getString('noResults') : '';
-
-    if (noResults)
-      return;
-
-    if (this.getRangeInDays() == HistoryModel.Range.MONTH &&
-        groupByDomain) {
-      // Group everything together in the month view.
-      this.addMonthResults_(results, resultsFragment);
-    } else {
-      var dayStart = 0;
-      var dayEnd = 0;
-      // Go through all of the visits and process them in chunks of one day.
-      while (dayEnd < results.length) {
-        // Skip over the ones that are already rendered.
-        while (dayStart < results.length && results[dayStart].isRendered)
-          ++dayStart;
-        var dayEnd = dayStart + 1;
-        while (dayEnd < results.length && results[dayEnd].continued)
-          ++dayEnd;
-
-        this.addDayResults_(
-            results.slice(dayStart, dayEnd), resultsFragment);
-      }
-    }
-
-    // Add all the days and their visits to the page.
-    this.resultDiv_.appendChild(resultsFragment);
-  }
-  // After the results have been added to the DOM, determine the size of the
-  // time column.
-  this.setTimeColumnWidth_();
-};
-
-var focusGridRowSelector = [
-  ':-webkit-any(.day-results, .search-results) > .entry:not(.fade-out)',
-  '.expand .grouped .entry:not(.fade-out)',
-  '.site-domain-wrapper'
-].join(', ');
-
-/** @private */
-HistoryView.prototype.updateFocusGrid_ = function() {
-  var rows = this.resultDiv_.querySelectorAll(focusGridRowSelector);
-  this.focusGrid_.destroy();
-
-  for (var i = 0; i < rows.length; ++i) {
-    assert(rows[i].parentNode);
-    this.focusGrid_.addRow(new HistoryFocusRow(rows[i], this.resultDiv_));
-  }
-  this.focusGrid_.ensureRowActive();
-};
-
-/**
- * Update the visibility of the page navigation buttons.
- * @private
- */
-HistoryView.prototype.updateNavBar_ = function() {
-  this.updateRangeButtons_();
-
-  // If grouping by domain is enabled, there's a control bar on top, don't show
-  // the one on the bottom as well.
-  if (!loadTimeData.getBoolean('groupByDomain')) {
-    $('newest-button').hidden = this.pageIndex_ == 0;
-    $('newer-button').hidden = this.pageIndex_ == 0;
-    $('older-button').hidden =
-        this.model_.rangeInDays_ != HistoryModel.Range.ALL_TIME ||
-        !this.model_.hasMoreResults();
-  }
-};
-
-/**
- * Updates the visibility of the 'Clear browsing data' button.
- * Only used on mobile platforms.
- * @private
- */
-HistoryView.prototype.updateClearBrowsingDataButton_ = function() {
-  // Ideally, we should hide the 'Clear browsing data' button whenever the
-  // soft keyboard is visible. This is not possible, so instead, hide the
-  // button whenever the search field has focus.
-  $('clear-browsing-data').hidden =
-      (document.activeElement === $('search-field'));
-};
-
-/**
- * Dynamically sets the min-width of the time column for history entries.
- * This ensures that all entry times will have the same width, without
- * imposing a fixed width that may not be appropriate for some locales.
- * @private
- */
-HistoryView.prototype.setTimeColumnWidth_ = function() {
-  // Find the maximum width of all the time elements on the page.
-  var times = this.resultDiv_.querySelectorAll('.entry .time');
-  Array.prototype.forEach.call(times, function(el) {
-    el.style.minWidth = '-webkit-min-content';
-  });
-  var widths = Array.prototype.map.call(times, function(el) {
-    // Add an extra pixel to prevent rounding errors from causing the text to
-    // be ellipsized at certain zoom levels (see crbug.com/329779).
-    return el.clientWidth + 1;
-  });
-  Array.prototype.forEach.call(times, function(el) {
-    el.style.minWidth = '';
-  });
-  var maxWidth = widths.length ? Math.max.apply(null, widths) : 0;
-
-  // Add a dynamic stylesheet to the page (or replace the existing one), to
-  // ensure that all entry times have the same width.
-  var styleEl = $('timeColumnStyle');
-  if (!styleEl) {
-    styleEl = document.head.appendChild(document.createElement('style'));
-    styleEl.id = 'timeColumnStyle';
-  }
-  styleEl.textContent = '.entry .time { min-width: ' + maxWidth + 'px; }';
-};
-
-/**
- * Toggles an element in the grouped history.
- * @param {Event} e The event with element |e.target| which was clicked on.
- * @private
- */
-HistoryView.prototype.toggleGroupedVisits_ = function(e) {
-  var entry = findAncestorByClass(/** @type {Element} */(e.target),
-                                  'site-entry');
-  var innerResultList = entry.querySelector('.site-results');
-
-  if (entry.classList.contains('expand')) {
-    innerResultList.style.height = 0;
-    innerResultList.setAttribute('aria-hidden', 'true');
-  } else {
-    innerResultList.setAttribute('aria-hidden', 'false');
-    innerResultList.style.height = 'auto';
-    // transition does not work on height:auto elements so first set
-    // the height to auto so that it is computed and then set it to the
-    // computed value in pixels so the transition works properly.
-    var height = innerResultList.clientHeight;
-    innerResultList.style.height = 0;
-    setTimeout(function() {
-      innerResultList.style.height = height + 'px';
-    }, 0);
-  }
-
-  entry.classList.toggle('expand');
-
-  var root = entry.querySelector('.site-domain-wrapper');
-
-  this.focusGrid_.rows.forEach(function(row) {
-    row.makeActive(row.root == root);
-  });
-
-  this.updateFocusGrid_();
-};
-
-///////////////////////////////////////////////////////////////////////////////
-// State object:
-/**
- * An 'AJAX-history' implementation.
- * @param {HistoryModel} model The model we're representing.
- * @param {HistoryView} view The view we're representing.
- * @constructor
- */
-function PageState(model, view) {
-  // Enforce a singleton.
-  if (PageState.instance) {
-    return PageState.instance;
-  }
-
-  this.model = model;
-  this.view = view;
-
-  if (typeof this.checker_ != 'undefined' && this.checker_) {
-    clearInterval(this.checker_);
-  }
-
-  // TODO(glen): Replace this with a bound method so we don't need
-  //     public model and view.
-  this.checker_ = window.setInterval(function() {
-    var hashData = this.getHashData();
-    var page = parseInt(hashData.page, 10);
-    var range = parseInt(hashData.range, 10);
-    var offset = parseInt(hashData.offset, 10);
-    if (hashData.q != this.model.getSearchText() ||
-        page != this.view.getPage() ||
-        range != this.model.rangeInDays ||
-        offset != this.model.offset) {
-      this.view.setPageState(hashData.q, page, range, offset);
-    }
-  }.bind(this), 50);
-}
-
-/**
- * Holds the singleton instance.
- */
-PageState.instance = null;
-
-/**
- * @return {Object} An object containing parameters from our window hash.
- */
-PageState.prototype.getHashData = function() {
-  var result = {
-    q: '',
-    page: 0,
-    range: 0,
-    offset: 0
-  };
-
-  if (!window.location.hash)
-    return result;
-
-  var hashSplit = window.location.hash.substr(1).split('&');
-  for (var i = 0; i < hashSplit.length; i++) {
-    var pair = hashSplit[i].split('=');
-    if (pair.length > 1)
-      result[pair[0]] = decodeURIComponent(pair[1].replace(/\+/g, ' '));
-  }
-
-  return result;
-};
-
-/**
- * Set the hash to a specified state, this will create an entry in the
- * session history so the back button cycles through hash states, which
- * are then picked up by our listener.
- * @param {string} term The current search string.
- * @param {number} page The page currently being viewed.
- * @param {HistoryModel.Range} range The range to view or search over.
- * @param {number} offset Set the begining of the query to the specific offset.
- */
-PageState.prototype.setUIState = function(term, page, range, offset) {
-  // Make sure the form looks pretty.
-  $('search-field').value = term;
-  var hash = this.getHashData();
-  if (hash.q != term || hash.page != page || hash.range != range ||
-      hash.offset != offset) {
-    window.location.hash = PageState.getHashString(term, page, range, offset);
-  }
-};
-
-/**
- * Static method to get the hash string for a specified state
- * @param {string} term The current search string.
- * @param {number} page The page currently being viewed.
- * @param {HistoryModel.Range} range The range to view or search over.
- * @param {number} offset Set the begining of the query to the specific offset.
- * @return {string} The string to be used in a hash.
- */
-PageState.getHashString = function(term, page, range, offset) {
-  // Omit elements that are empty.
-  var newHash = [];
-
-  if (term)
-    newHash.push('q=' + encodeURIComponent(term));
-
-  if (page)
-    newHash.push('page=' + page);
-
-  if (range)
-    newHash.push('range=' + range);
-
-  if (offset)
-    newHash.push('offset=' + offset);
-
-  return newHash.join('&');
-};
-
-///////////////////////////////////////////////////////////////////////////////
-// Document Functions:
-/**
- * Window onload handler, sets up the page.
- */
-function load() {
-  uber.onContentFrameLoaded();
-  FocusOutlineManager.forDocument(document);
-
-  var searchField = $('search-field');
-
-  historyModel = new HistoryModel();
-  historyView = new HistoryView(historyModel);
-  pageState = new PageState(historyModel, historyView);
-
-  // Create default view.
-  var hashData = pageState.getHashData();
-  var page = parseInt(hashData.page, 10) || historyView.getPage();
-  var range = /** @type {HistoryModel.Range} */(parseInt(hashData.range, 10)) ||
-      historyView.getRangeInDays();
-  var offset = parseInt(hashData.offset, 10) || historyView.getOffset();
-  historyView.setPageState(hashData.q, page, range, offset);
-
-  if ($('overlay')) {
-    cr.ui.overlay.setupOverlay($('overlay'));
-    cr.ui.overlay.globalInitialization();
-  }
-  HistoryFocusManager.getInstance().initialize();
-
-  var doSearch = function(e) {
-    recordUmaAction('HistoryPage_Search');
-    historyView.setSearch(searchField.value);
-
-    if (isMobileVersion())
-      searchField.blur();  // Dismiss the keyboard.
-  };
-
-  var removeMenu = getRequiredElement('remove-visit');
-  // Decorate remove-visit before disabling/hiding because the values are
-  // overwritten when decorating a MenuItem that has a Command.
-  cr.ui.decorate(removeMenu, MenuItem);
-  removeMenu.disabled = !loadTimeData.getBoolean('allowDeletingHistory');
-  removeMenu.hidden = loadTimeData.getBoolean('hideDeleteVisitUI');
-
-  document.addEventListener('command', handleCommand);
-
-  searchField.addEventListener('search', doSearch);
-  $('search-button').addEventListener('click', doSearch);
-
-  $('more-from-site').addEventListener('activate', function(e) {
-    activeVisit.showMoreFromSite_();
-    activeVisit = null;
-  });
-
-  // Only show the controls if the command line switch is activated or the user
-  // is supervised.
-  if (loadTimeData.getBoolean('groupByDomain')) {
-    $('history-page').classList.add('big-topbar-page');
-    $('filter-controls').hidden = false;
-  }
-  // Hide the top container which has the "Clear browsing data" and "Remove
-  // selected entries" buttons if deleting history is not allowed.
-  if (!loadTimeData.getBoolean('allowDeletingHistory'))
-    $('top-container').hidden = true;
-
-  uber.setTitle(loadTimeData.getString('title'));
-
-  // Adjust the position of the notification bar when the window size changes.
-  window.addEventListener('resize',
-      historyView.positionNotificationBar.bind(historyView));
-
-  if (isMobileVersion()) {
-    // Move the search box out of the header.
-    var resultsDisplay = $('results-display');
-    resultsDisplay.parentNode.insertBefore($('search-field'), resultsDisplay);
-
-    window.addEventListener(
-        'resize', historyView.updateClearBrowsingDataButton_);
-
-// <if expr="is_ios">
-    // Trigger window resize event when search field is focused to force update
-    // of the clear browsing button, which should disappear when search field
-    // is active. The window is not resized when the virtual keyboard is shown
-    // on iOS.
-    searchField.addEventListener('focus', function() {
-      cr.dispatchSimpleEvent(window, 'resize');
-    });
-// </if>  /* is_ios */
-
-    // When the search field loses focus, add a delay before updating the
-    // visibility, otherwise the button will flash on the screen before the
-    // keyboard animates away.
-    searchField.addEventListener('blur', function() {
-      setTimeout(historyView.updateClearBrowsingDataButton_, 250);
-    });
-
-    // Move the button to the bottom of the page.
-    $('history-page').appendChild($('clear-browsing-data'));
-  } else {
-    window.addEventListener('message', function(e) {
-      e = /** @type {!MessageEvent<!{method: string}>} */(e);
-      if (e.data.method == 'frameSelected')
-        searchField.focus();
-    });
-    searchField.focus();
-  }
-
-// <if expr="is_ios">
-  function checkKeyboardVisibility() {
-    // Figure out the real height based on the orientation, becauase
-    // screen.width and screen.height don't update after rotation.
-    var screenHeight = window.orientation % 180 ? screen.width : screen.height;
-
-    // Assume that the keyboard is visible if more than 30% of the screen is
-    // taken up by window chrome.
-    var isKeyboardVisible = (window.innerHeight / screenHeight) < 0.7;
-
-    document.body.classList.toggle('ios-keyboard-visible', isKeyboardVisible);
-  }
-  window.addEventListener('orientationchange', checkKeyboardVisibility);
-  window.addEventListener('resize', checkKeyboardVisibility);
-// </if> /* is_ios */
-}
-
-/**
- * Handle all commands in the history page.
- * @param {!Event} e is a command event.
- */
-function handleCommand(e) {
-  switch (e.command.id) {
-    case 'remove-visit-command':
-      // Removing visited items needs to be done with a command in order to have
-      // proper focus. This is because the command event is handled after the
-      // menu dialog is no longer visible and focus has returned to the history
-      // items. The activate event is handled when the menu dialog is still
-      // visible and focus is lost.
-      // removeEntryFromHistory_ will update activeVisit to the newly focused
-      // history item.
-      assert(!$('remove-visit').disabled);
-      activeVisit.removeEntryFromHistory_(e);
-      break;
-  }
-}
-
-/**
- * Updates the filter status labels of a host/URL entry to the current value.
- * @param {Element} statusElement The div which contains the status labels.
- * @param {SupervisedUserFilteringBehavior} newStatus The filter status of the
- *     current domain/URL.
- */
-function updateHostStatus(statusElement, newStatus) {
-  var filteringBehaviorDiv =
-      statusElement.querySelector('.filtering-behavior');
-  // Reset to the base class first, then add modifier classes if needed.
-  filteringBehaviorDiv.className = 'filtering-behavior';
-  if (newStatus == SupervisedUserFilteringBehavior.BLOCK) {
-    filteringBehaviorDiv.textContent =
-        loadTimeData.getString('filterBlocked');
-    filteringBehaviorDiv.classList.add('filter-blocked');
-  } else {
-    filteringBehaviorDiv.textContent = '';
-  }
-}
-
-/**
- * Click handler for the 'Clear browsing data' dialog.
- * @param {Event} e The click event.
- */
-function openClearBrowsingData(e) {
-  recordUmaAction('HistoryPage_InitClearBrowsingData');
-  chrome.send('clearBrowsingData');
-}
-
-/**
- * Shows the dialog for the user to confirm removal of selected history entries.
- */
-function showConfirmationOverlay() {
-  $('alertOverlay').classList.add('showing');
-  $('overlay').hidden = false;
-  $('history-page').setAttribute('aria-hidden', 'true');
-  uber.invokeMethodOnParent('beginInterceptingEvents');
-
-  // Change focus to the overlay if any other control was focused by keyboard
-  // before. Otherwise, no one should have focus.
-  var focusOverlay = FocusOutlineManager.forDocument(document).visible &&
-                     document.activeElement != document.body;
-  if ($('history-page').contains(document.activeElement))
-    document.activeElement.blur();
-
-  if (focusOverlay) {
-    // Wait until the browser knows the button has had a chance to become
-    // visible.
-    window.requestAnimationFrame(function() {
-      var button = cr.ui.overlay.getDefaultButton($('overlay'));
-      if (button)
-        button.focus();
-    });
-  }
-  $('alertOverlay').classList.toggle('focus-on-hide', focusOverlay);
-}
-
-/**
- * Hides the confirmation overlay used to confirm selected history entries.
- */
-function hideConfirmationOverlay() {
-  $('alertOverlay').classList.remove('showing');
-  $('overlay').hidden = true;
-  $('history-page').removeAttribute('aria-hidden');
-  uber.invokeMethodOnParent('stopInterceptingEvents');
-}
-
-/**
- * Shows the confirmation alert for history deletions and permits browser tests
- * to override the dialog.
- * @param {function()=} okCallback A function to be called when the user presses
- *     the ok button.
- * @param {function()=} cancelCallback A function to be called when the user
- *     presses the cancel button.
- */
-function confirmDeletion(okCallback, cancelCallback) {
-  alertOverlay.setValues(
-      loadTimeData.getString('removeSelected'),
-      loadTimeData.getString('deleteWarning'),
-      loadTimeData.getString('deleteConfirm'),
-      loadTimeData.getString('cancel'),
-      okCallback,
-      cancelCallback);
-  showConfirmationOverlay();
-}
-
-/**
- * Click handler for the 'Remove selected items' button.
- * Confirms the deletion with the user, and then deletes the selected visits.
- */
-function removeItems() {
-  recordUmaAction('HistoryPage_RemoveSelected');
-  if (!loadTimeData.getBoolean('allowDeletingHistory'))
-    return;
-
-  var checked = $('results-display').querySelectorAll(
-      '.entry-box input[type=checkbox]:checked:not([disabled])');
-  var disabledItems = [];
-  var toBeRemoved = [];
-
-  for (var i = 0; i < checked.length; i++) {
-    var checkbox = checked[i];
-    var entry = findAncestorByClass(checkbox, 'entry');
-    toBeRemoved.push(entry.visit);
-
-    // Disable the checkbox and put a strikethrough style on the link, so the
-    // user can see what will be deleted.
-    checkbox.disabled = true;
-    entry.visit.titleLink.classList.add('to-be-removed');
-    disabledItems.push(checkbox);
-    var integerId = parseInt(entry.visit.id_, 10);
-    // Record the ID of the entry to signify how many entries are above this
-    // link on the page.
-    recordUmaHistogram('HistoryPage.RemoveEntryPosition',
-                       UMA_MAX_BUCKET_VALUE,
-                       integerId);
-    if (integerId <= UMA_MAX_SUBSET_BUCKET_VALUE) {
-      recordUmaHistogram('HistoryPage.RemoveEntryPositionSubset',
-                         UMA_MAX_SUBSET_BUCKET_VALUE,
-                         integerId);
-    }
-    if (entry.parentNode.className == 'search-results')
-      recordUmaAction('HistoryPage_SearchResultRemove');
-  }
-
-  function onConfirmRemove() {
-    recordUmaAction('HistoryPage_ConfirmRemoveSelected');
-    historyModel.removeVisitsFromHistory(toBeRemoved,
-        historyView.reload.bind(historyView));
-    $('overlay').removeEventListener('cancelOverlay', onCancelRemove);
-    hideConfirmationOverlay();
-    if ($('alertOverlay').classList.contains('focus-on-hide') &&
-        FocusOutlineManager.forDocument(document).visible) {
-      $('search-field').focus();
-    }
-  }
-
-  function onCancelRemove() {
-    recordUmaAction('HistoryPage_CancelRemoveSelected');
-    // Return everything to its previous state.
-    for (var i = 0; i < disabledItems.length; i++) {
-      var checkbox = disabledItems[i];
-      checkbox.disabled = false;
-
-      var entry = findAncestorByClass(checkbox, 'entry');
-      entry.visit.titleLink.classList.remove('to-be-removed');
-    }
-    $('overlay').removeEventListener('cancelOverlay', onCancelRemove);
-    hideConfirmationOverlay();
-    if ($('alertOverlay').classList.contains('focus-on-hide') &&
-        FocusOutlineManager.forDocument(document).visible) {
-      $('remove-selected').focus();
-    }
-  }
-
-  if (checked.length) {
-    confirmDeletion(onConfirmRemove, onCancelRemove);
-    $('overlay').addEventListener('cancelOverlay', onCancelRemove);
-  }
-}
-
-/**
- * Handler for the 'click' event on a checkbox.
- * @param {Event} e The click event.
- */
-function checkboxClicked(e) {
-  handleCheckboxStateChange(/** @type {!HTMLInputElement} */(e.currentTarget),
-                            e.shiftKey);
-}
-
-/**
- * Post-process of checkbox state change. This handles range selection and
- * updates internal state.
- * @param {!HTMLInputElement} checkbox Clicked checkbox.
- * @param {boolean} shiftKey true if shift key is pressed.
- */
-function handleCheckboxStateChange(checkbox, shiftKey) {
-  updateParentCheckbox(checkbox);
-  var id = Number(checkbox.id.slice('checkbox-'.length));
-  // Handle multi-select if shift was pressed.
-  if (shiftKey && (selectionAnchor != -1)) {
-    var checked = checkbox.checked;
-    // Set all checkboxes from the anchor up to the clicked checkbox to the
-    // state of the clicked one.
-    var begin = Math.min(id, selectionAnchor);
-    var end = Math.max(id, selectionAnchor);
-    for (var i = begin; i <= end; i++) {
-      var ithCheckbox = document.querySelector('#checkbox-' + i);
-      if (ithCheckbox) {
-        ithCheckbox.checked = checked;
-        updateParentCheckbox(ithCheckbox);
-      }
-    }
-  }
-  selectionAnchor = id;
-
-  historyView.updateSelectionEditButtons();
-}
-
-/**
- * Handler for the 'click' event on a domain checkbox. Checkes or unchecks the
- * checkboxes of the visits to this domain in the respective group.
- * @param {Event} e The click event.
- */
-function domainCheckboxClicked(e) {
-  var siteEntry = findAncestorByClass(/** @type {Element} */(e.currentTarget),
-                                      'site-entry');
-  var checkboxes =
-      siteEntry.querySelectorAll('.site-results input[type=checkbox]');
-  for (var i = 0; i < checkboxes.length; i++)
-    checkboxes[i].checked = e.currentTarget.checked;
-  historyView.updateSelectionEditButtons();
-  // Stop propagation as clicking the checkbox would otherwise trigger the
-  // group to collapse/expand.
-  e.stopPropagation();
-}
-
-/**
- * Updates the domain checkbox for this visit checkbox if it has been
- * unchecked.
- * @param {Element} checkbox The checkbox that has been clicked.
- */
-function updateParentCheckbox(checkbox) {
-  if (checkbox.checked)
-    return;
-
-  var entry = findAncestorByClass(checkbox, 'site-entry');
-  if (!entry)
-    return;
-
-  var groupCheckbox = entry.querySelector('.site-domain-wrapper input');
-  if (groupCheckbox)
-    groupCheckbox.checked = false;
-}
-
-/**
- * Handle click event for entryBoxes.
- * @param {!Event} event A click event.
- */
-function entryBoxClick(event) {
-  event = /** @type {!MouseEvent} */(event);
-  // Do nothing if a bookmark star is clicked.
-  if (event.defaultPrevented)
-    return;
-  var element = event.target;
-  // Do nothing if the event happened in an interactive element.
-  for (; element != event.currentTarget; element = element.parentNode) {
-    switch (element.tagName) {
-      case 'A':
-      case 'BUTTON':
-      case 'INPUT':
-        return;
-    }
-  }
-  var checkbox = assertInstanceof($(event.currentTarget.getAttribute('for')),
-                                  HTMLInputElement);
-  checkbox.checked = !checkbox.checked;
-  handleCheckboxStateChange(checkbox, event.shiftKey);
-  // We don't want to focus on the checkbox.
-  event.preventDefault();
-}
-
-/**
- * Called when an individual history entry has been removed from the page.
- * This will only be called when all the elements affected by the deletion
- * have been removed from the DOM and the animations have completed.
- */
-function onEntryRemoved() {
-  historyView.onEntryRemoved();
-}
-
-/**
- * Triggers a fade-out animation, and then removes |node| from the DOM.
- * @param {Node} node The node to be removed.
- * @param {Function?} onRemove A function to be called after the node
- *     has been removed from the DOM.
- * @param {*=} opt_scope An optional scope object to call |onRemove| with.
- */
-function removeNode(node, onRemove, opt_scope) {
-  node.classList.add('fade-out'); // Trigger CSS fade out animation.
-
-  // Delete the node when the animation is complete.
-  node.addEventListener('transitionend', function(e) {
-    node.parentNode.removeChild(node);
-
-    // In case there is nested deletion happening, prevent this event from
-    // being handled by listeners on ancestor nodes.
-    e.stopPropagation();
-
-    if (onRemove)
-      onRemove.call(opt_scope);
-  });
-}
-
-/**
- * Builds the DOM elements to show the filtering status of a domain/URL.
- * @param {SupervisedUserFilteringBehavior} filteringBehavior The filter
- *     behavior for this item.
- * @return {Element} Returns the DOM elements which show the status.
- */
-function getFilteringStatusDOM(filteringBehavior) {
-  var filterStatusDiv = createElementWithClassName('div', 'filter-status');
-  var filteringBehaviorDiv =
-      createElementWithClassName('div', 'filtering-behavior');
-  filterStatusDiv.appendChild(filteringBehaviorDiv);
-
-  updateHostStatus(filterStatusDiv, filteringBehavior);
-  return filterStatusDiv;
-}
-
-
-///////////////////////////////////////////////////////////////////////////////
-// Chrome callbacks:
-
-/**
- * Our history system calls this function with results from searches.
- * @param {HistoryQuery} info An object containing information about the query.
- * @param {Array<HistoryEntry>} results A list of results.
- */
-function historyResult(info, results) {
-  historyModel.addResults(info, results);
-}
-
-/**
- * Called by the history backend after receiving results and after discovering
- * the existence of other forms of browsing history.
- * @param {boolean} hasSyncedResults Whether there are synced results.
- * @param {boolean} includeOtherFormsOfBrowsingHistory Whether to include
- *     a sentence about the existence of other forms of browsing history.
- */
-function showNotification(
-    hasSyncedResults, includeOtherFormsOfBrowsingHistory) {
-  historyView.showWebHistoryNotification(
-      hasSyncedResults, includeOtherFormsOfBrowsingHistory);
-}
-
-/**
- * Called by the history backend when history removal is successful.
- */
-function deleteComplete() {
-  historyModel.deleteComplete();
-}
-
-/**
- * Called by the history backend when history removal is unsuccessful.
- */
-function deleteFailed() {
-  window.console.log('Delete failed');
-}
-
-/**
- * Called when the history is deleted by someone else.
- */
-function historyDeleted() {
-  var anyChecked = document.querySelector('.entry input:checked') != null;
-  // Reload the page, unless the user has any items checked.
-  // TODO(dubroy): We should just reload the page & restore the checked items.
-  if (!anyChecked)
-    historyView.reload();
-}
-
-// Add handlers to HTML elements.
-document.addEventListener('DOMContentLoaded', load);
-
-// This event lets us enable and disable menu items before the menu is shown.
-document.addEventListener('canExecute', function(e) {
-  e.canExecute = true;
-});