MD Downloads: add first meaningful paint metrics to UMA

chrome/browser/resources/md_downloads/crisper.js

Index: chrome/browser/resources/md_downloads/crisper.js
diff --git a/chrome/browser/resources/md_downloads/crisper.js b/chrome/browser/resources/md_downloads/crisper.js
index 9af2257456fedade036894da24c178ffa0818489..db6b390d312fb21c26f86e231294d402adcc7899 100644
--- a/chrome/browser/resources/md_downloads/crisper.js
+++ b/chrome/browser/resources/md_downloads/crisper.js
@@ -64,8 +64,8 @@ cr.define("downloads",function(){var Toolbar=Polymer({is:"downloads-toolbar",pro
 // Copyright 2015 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.
-cr.define("downloads",function(){var Manager=Polymer({is:"downloads-manager",properties:{hasDownloads_:{observer:"hasDownloadsChanged_",type:Boolean},hasShadow_:{type:Boolean,value:false,reflectToAttribute:true},inSearchMode_:{type:Boolean,value:false},items_:{type:Array,value:function(){return[]}},spinnerActive_:{type:Boolean,notify:true}},hostAttributes:{loading:true},listeners:{"downloads-list.scroll":"onListScroll_","toolbar.search-changed":"onSearchChanged_"},observers:["itemsChanged_(items_.*)"],clearAll_:function(){this.set("items_",[])},hasDownloadsChanged_:function(){if(loadTimeData.getBoolean("allowDeletingHistory"))this.$.toolbar.downloadsShowing=this.hasDownloads_;if(this.hasDownloads_)this.$["downloads-list"].fire("iron-resize")},insertItems_:function(index,list){this.splice.apply(this,["items_",index,0].concat(list));this.updateHideDates_(index,index+list.length);this.removeAttribute("loading");this.spinnerActive_=false},itemsChanged_:function(){this.hasDownloads_=this.items_.length>0},noDownloadsText_:function(){return loadTimeData.getString(this.inSearchMode_?"noSearchResults":"noDownloads")},onCanExecute_:function(e){e=e;switch(e.command.id){case"undo-command":e.canExecute=this.$.toolbar.canUndo();break;case"clear-all-command":e.canExecute=this.$.toolbar.canClearAll();break;case"find-command":e.canExecute=true;break}},onCommand_:function(e){if(e.command.id=="clear-all-command")downloads.ActionService.getInstance().clearAll();else if(e.command.id=="undo-command")downloads.ActionService.getInstance().undo();else if(e.command.id=="find-command")this.$.toolbar.onFindCommand()},onListScroll_:function(){var list=this.$["downloads-list"];if(list.scrollHeight-list.scrollTop-list.offsetHeight<=100){downloads.ActionService.getInstance().loadMore()}this.hasShadow_=list.scrollTop>0},onLoad_:function(){cr.ui.decorate("command",cr.ui.Command);document.addEventListener("canExecute",this.onCanExecute_.bind(this));document.addEventListener("command",this.onCommand_.bind(this));downloads.ActionService.getInstance().loadMore()},onSearchChanged_:function(){this.inSearchMode_=downloads.ActionService.getInstance().isSearching()},removeItem_:function(index){this.splice("items_",index,1);this.updateHideDates_(index,index);this.onListScroll_()},updateHideDates_:function(start,end){for(var i=start;i<=end;++i){var current=this.items_[i];if(!current)continue;var prev=this.items_[i-1];var hideDate=!!prev&&prev.date_string==current.date_string;this.set("items_."+i+".hideDate",hideDate)}},updateItem_:function(index,data){this.set("items_."+index,data);this.updateHideDates_(index,index);var list=this.$["downloads-list"];list.updateSizeForItem(index)}});Manager.clearAll=function(){Manager.get().clearAll_()};Manager.get=function(){return queryRequiredElement("downloads-manager")};Manager.insertItems=function(index,list){Manager.get().insertItems_(index,list)};Manager.onLoad=function(){Manager.get().onLoad_()};Manager.removeItem=function(index){Manager.get().removeItem_(index)};Manager.updateItem=function(index,data){Manager.get().updateItem_(index,data)};return{Manager:Manager}});
+cr.define("downloads",function(){var Manager=Polymer({is:"downloads-manager",properties:{hasDownloads_:{observer:"hasDownloadsChanged_",type:Boolean},hasShadow_:{type:Boolean,value:false,reflectToAttribute:true},inSearchMode_:{type:Boolean,value:false},items_:{type:Array,value:function(){return[]}},spinnerActive_:{type:Boolean,notify:true}},hostAttributes:{loading:true},listeners:{"downloads-list.scroll":"onListScroll_","toolbar.search-changed":"onSearchChanged_"},observers:["itemsChanged_(items_.*)"],loaded_:new PromiseResolver,clearAll_:function(){this.set("items_",[])},hasDownloadsChanged_:function(){if(loadTimeData.getBoolean("allowDeletingHistory"))this.$.toolbar.downloadsShowing=this.hasDownloads_;if(this.hasDownloads_)this.$["downloads-list"].fire("iron-resize")},insertItems_:function(index,list){this.splice.apply(this,["items_",index,0].concat(list));this.updateHideDates_(index,index+list.length);if(this.hasAttribute("loading")){this.removeAttribute("loading");this.loaded_.resolve()}this.spinnerActive_=false},itemsChanged_:function(){this.hasDownloads_=this.items_.length>0},noDownloadsText_:function(){return loadTimeData.getString(this.inSearchMode_?"noSearchResults":"noDownloads")},onCanExecute_:function(e){e=e;switch(e.command.id){case"undo-command":e.canExecute=this.$.toolbar.canUndo();break;case"clear-all-command":e.canExecute=this.$.toolbar.canClearAll();break;case"find-command":e.canExecute=true;break}},onCommand_:function(e){if(e.command.id=="clear-all-command")downloads.ActionService.getInstance().clearAll();else if(e.command.id=="undo-command")downloads.ActionService.getInstance().undo();else if(e.command.id=="find-command")this.$.toolbar.onFindCommand()},onListScroll_:function(){var list=this.$["downloads-list"];if(list.scrollHeight-list.scrollTop-list.offsetHeight<=100){downloads.ActionService.getInstance().loadMore()}this.hasShadow_=list.scrollTop>0},onLoad_:function(){cr.ui.decorate("command",cr.ui.Command);document.addEventListener("canExecute",this.onCanExecute_.bind(this));document.addEventListener("command",this.onCommand_.bind(this));downloads.ActionService.getInstance().loadMore();return this.loaded_.promise},onSearchChanged_:function(){this.inSearchMode_=downloads.ActionService.getInstance().isSearching()},removeItem_:function(index){this.splice("items_",index,1);this.updateHideDates_(index,index);this.onListScroll_()},updateHideDates_:function(start,end){for(var i=start;i<=end;++i){var current=this.items_[i];if(!current)continue;var prev=this.items_[i-1];var hideDate=!!prev&&prev.date_string==current.date_string;this.set("items_."+i+".hideDate",hideDate)}},updateItem_:function(index,data){this.set("items_."+index,data);this.updateHideDates_(index,index);var list=this.$["downloads-list"];list.updateSizeForItem(index)}});Manager.clearAll=function(){Manager.get().clearAll_()};Manager.get=function(){return queryRequiredElement("downloads-manager")};Manager.insertItems=function(index,list){Manager.get().insertItems_(index,list)};Manager.onLoad=function(){return Manager.get().onLoad_()};Manager.removeItem=function(index){Manager.get().removeItem_(index)};Manager.updateItem=function(index,data){Manager.get().updateItem_(index,data)};return{Manager:Manager}});
 // Copyright 2015 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.
-window.addEventListener("load",function(){downloads.Manager.onLoad();document.fonts.load("bold 12px Roboto")});
+window.addEventListener("load",function(){downloads.Manager.onLoad().then(function(){requestIdleCallback(function(){chrome.send("metricsHandler:recordTime",["Downloads.ResultsRenderedTime",window.performance.now()]);document.fonts.load("bold 12px Roboto")})})});