MD WebUI: Make cr-lazy-render get() synchronous

chrome/browser/resources/md_history/app.crisper.js

 // Copyright 2016 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.
 function PromiseResolver() {
   this.resolve_;
   this.reject_;
   this.promise_ = new Promise(function(resolve, reject) {
     this.resolve_ = resolve;
     this.reject_ = reject;
   }.bind(this));
@@ skipping 5369 matching lines @@
   }
 });
 
 // Copyright 2016 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.
 Polymer({
   is: 'cr-lazy-render',
   "extends": 'template',
   behaviors: [ Polymer.Templatizer ],
-  _renderPromise: null,
-  _child: null,
+  child_: null,
   get: function() {
-    if (!this._renderPromise) {
-      this._renderPromise = new Promise(function(resolve) {
-        this._debounceTemplate(function() {
-          this._render();
-          this._renderPromise = null;
-          resolve(this.getIfExists());
-        }.bind(this));
-      }.bind(this));
-    }
-    return this._renderPromise;
+    if (!this.child_) this.render_();
+    return this.child_;
   },
   getIfExists: function() {
-    return this._child;
+    return this.child_;
   },
-  _render: function() {
+  render_: function() {
     if (!this.ctor) this.templatize(this);
     var parentNode = this.parentNode;
-    if (parentNode && !this._child) {
+    if (parentNode && !this.child_) {
       var instance = this.stamp({});
-      this._child = instance.root.querySelector('*');
+      this.child_ = instance.root.firstElementChild;
       parentNode.insertBefore(instance.root, this);
     }
   },
   _forwardParentProp: function(prop, value) {
-    if (this._child) this._child._templateInstance[prop] = value;
+    if (this.child_) this.child_._templateInstance[prop] = value;
   },
   _forwardParentPath: function(path, value) {
-    if (this._child) this._child._templateInstance.notifyPath(path, value, true);
+    if (this.child_) this.child_._templateInstance.notifyPath(path, value, true);
   }
 });
 
 (function() {
   'use strict';
   Polymer.IronA11yAnnouncer = Polymer({
     is: 'iron-a11y-announcer',
     properties: {
       mode: {
         type: String,
@@ skipping 700 matching lines @@
     if (this.searchTerm == search) return;
     this.searchTerm = search;
     var searchField = this.$['main-toolbar'].getSearchField();
     searchField.showAndFocus();
     searchField.setValue(search);
   },
   onSearchChanged_: function(event) {
     this.searchTerm = event.detail;
   },
   onInfoButtonTap_: function() {
-    this.$.syncNotice.get().then(function(dropdown) {
-      dropdown.positionTarget = this.$$('#info-button-icon');
-      if (dropdown.style.display == 'none') dropdown.open();
-    }.bind(this));
+    var dropdown = this.$.syncNotice.get();
+    dropdown.positionTarget = this.$$('#info-button-icon');
+    if (dropdown.style.display == 'none') dropdown.open();
   },
   onClearSelectionTap_: function() {
     this.fire('unselect-all');
   },
   onDeleteTap_: function() {
     this.fire('delete-selected');
   },
   get searchBar() {
     return this.$['main-toolbar'].getSearchField();
   },
@@ skipping 1969 matching lines @@
   },
   unselectAllItems: function(count) {
     var selectedList = this.getSelectedList_();
     if (selectedList) selectedList.unselectAllItems(count);
   },
   deleteSelectedWithPrompt: function() {
     if (!loadTimeData.getBoolean('allowDeletingHistory')) return;
     var browserService = md_history.BrowserService.getInstance();
     browserService.recordAction('RemoveSelected');
     if (this.queryState.searchTerm != '') browserService.recordAction('SearchResultRemove');
-    this.$.dialog.get().then(function(dialog) {
-      dialog.showModal();
-    });
+    this.$.dialog.get().showModal();
   },
   groupedRangeChanged_: function(range, oldRange) {
     this.selectedPage_ = range == HistoryRange.ALL_TIME ? 'infinite-list' : 'grouped-list';
     if (oldRange == undefined) return;
     this.queryHistory(false);
     this.fire('history-view-changed');
   },
   loadMoreHistory_: function() {
     this.queryHistory(true);
   },
@@ skipping 18 matching lines @@
     md_history.BrowserService.getInstance().recordAction('CancelRemoveSelected');
     var dialog = assert(this.$.dialog.getIfExists());
     dialog.close();
   },
   closeMenu_: function() {
     var menu = this.$.sharedMenu.getIfExists();
     if (menu) menu.closeMenu();
   },
   toggleMenu_: function(e) {
     var target = e.detail.target;
-    return this.$.sharedMenu.get().then(function(menu) {
-      menu.toggleMenu(target, e.detail);
-    });
+    var menu = this.$.sharedMenu.get();
+    menu.toggleMenu(target, e.detail);
   },
   onMoreFromSiteTap_: function() {
     md_history.BrowserService.getInstance().recordAction('EntryMenuShowMoreFromSite');
     var menu = assert(this.$.sharedMenu.getIfExists());
     this.fire('search-domain', {
       domain: menu.itemData.item.domain
     });
     menu.closeMenu();
   },
   onRemoveFromHistoryTap_: function() {
@@ skipping 165 matching lines @@
     };
   },
   onSignInTap_: function() {
     chrome.send('startSignInFlow');
   },
   onListScroll_: function() {
     var menu = this.$.menu.getIfExists();
     if (menu) menu.closeMenu();
   },
   onToggleMenu_: function(e) {
-    this.$.menu.get().then(function(menu) {
-      menu.toggleMenu(e.detail.target, e.detail.tag);
-      if (menu.menuOpen) {
-        md_history.BrowserService.getInstance().recordHistogram(SYNCED_TABS_HISTOGRAM_NAME, SyncedTabsHistogram.SHOW_SESSION_MENU, SyncedTabsHistogram.LIMIT);
-      }
-    });
+    var menu = this.$.menu.get();
+    menu.toggleMenu(e.detail.target, e.detail.tag);
+    if (menu.menuOpen) {
+      md_history.BrowserService.getInstance().recordHistogram(SYNCED_TABS_HISTOGRAM_NAME, SyncedTabsHistogram.SHOW_SESSION_MENU, SyncedTabsHistogram.LIMIT);
+    }
   },
   onOpenAllTap_: function() {
     var menu = assert(this.$.menu.getIfExists());
     var browserService = md_history.BrowserService.getInstance();
     browserService.recordHistogram(SYNCED_TABS_HISTOGRAM_NAME, SyncedTabsHistogram.OPEN_ALL, SyncedTabsHistogram.LIMIT);
     browserService.openForeignSessionAllTabs(menu.itemData);
     menu.closeMenu();
   },
   onDeleteSessionTap_: function() {
     var menu = assert(this.$.menu.getIfExists());
@@ skipping 312 matching lines @@
 
        case HistoryRange.MONTH:
         histogramValue = HistoryPageViewHistogram.GROUPED_MONTH;
         break;
       }
       break;
     }
     md_history.BrowserService.getInstance().recordHistogram('History.HistoryPageView', histogramValue, HistoryPageViewHistogram.END);
   }
 });