[DevTools] Improve UX of timeline column sort in Network panel.

Source/devtools/front_end/network/NetworkLogView.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008, 2009 Anthony Ricaud <rik@webkit.org>
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 480 matching lines @@
         return fragment;
     },
 
     _patchTimelineHeader: function()
     {
         var timelineSorting = createElement("select");
 
         var option = createElement("option");
         option.value = "startTime";
         option.label = WebInspector.UIString("Timeline");
+        option.disabled = true;
         timelineSorting.appendChild(option);
 
         option = createElement("option");
         option.value = "startTime";
-        option.label = WebInspector.UIString("Start Time");
+        option.label = WebInspector.UIString("Timeline \u2013 Start Time");
+        option.sortOrder = WebInspector.DataGrid.Order.Ascending;
         timelineSorting.appendChild(option);
 
         option = createElement("option");
         option.value = "responseTime";
-        option.label = WebInspector.UIString("Response Time");
+        option.label = WebInspector.UIString("Timeline \u2013 Response Time");
+        option.sortOrder = WebInspector.DataGrid.Order.Ascending;
         timelineSorting.appendChild(option);
 
         option = createElement("option");
         option.value = "endTime";
-        option.label = WebInspector.UIString("End Time");
+        option.label = WebInspector.UIString("Timeline \u2013 End Time");
+        option.sortOrder = WebInspector.DataGrid.Order.Ascending;
         timelineSorting.appendChild(option);
 
         option = createElement("option");
         option.value = "duration";
-        option.label = WebInspector.UIString("Duration");
+        option.label = WebInspector.UIString("Timeline \u2013 Total Duration");
+        option.sortOrder = WebInspector.DataGrid.Order.Descending;
         timelineSorting.appendChild(option);
 
         option = createElement("option");
         option.value = "latency";
-        option.label = WebInspector.UIString("Latency");
+        option.label = WebInspector.UIString("Timeline \u2013 Latency");
+        option.sortOrder = WebInspector.DataGrid.Order.Descending;
         timelineSorting.appendChild(option);
 
         var header = this._dataGrid.headerTableHeader("timeline");
         header.replaceChild(timelineSorting, header.firstChild);
+        header.createChild("div", "sort-order-icon-container").createChild("div", "sort-order-icon");
 
+        timelineSorting.selectedIndex = 1;
         timelineSorting.addEventListener("click", function(event) { event.consume(); }, false);
         timelineSorting.addEventListener("change", this._sortByTimeline.bind(this), false);
         this._timelineSortSelector = timelineSorting;
     },
 
     _createSortingFunctions: function()
     {
         this._sortingFunctions = {};
         this._sortingFunctions.name = WebInspector.NetworkDataGridNode.NameComparator;
         this._sortingFunctions.method = WebInspector.NetworkDataGridNode.RequestPropertyComparator.bind(null, "method", false);
@@ skipping 59 matching lines @@
         var selectedIndex = this._timelineSortSelector.selectedIndex;
         if (!selectedIndex)
             selectedIndex = 1; // Sort by start time by default.
         var selectedOption = this._timelineSortSelector[selectedIndex];
         var value = selectedOption.value;
 
         this._setCalculator(this._calculators[value]);
         var sortingFunction = this._sortingFunctions[value];
         this._dataGrid.sortNodes(sortingFunction);
         this._highlightNthMatchedRequestForSearch(this._updateMatchCountAndFindMatchIndex(this._currentMatchedRequestNode), false);
-        this._dataGrid.markColumnAsSortedBy("timeline", WebInspector.DataGrid.Order.Ascending);
+        this._dataGrid.markColumnAsSortedBy("timeline", selectedOption.sortOrder);
     },
 
     _updateSummaryBar: function()
     {
         var requestsNumber = this._nodesByRequestId.size;
 
         if (!requestsNumber) {
             if (this._summaryBarElement._isDisplayingWarning)
                 return;
             this._summaryBarElement._isDisplayingWarning = true;
@@ skipping 1398 matching lines @@
     if (request.endTime !== -1 && request.endTime < windowStart)
         return false;
     return true;
 }
 
 WebInspector.NetworkLogView.EventTypes = {
     RequestSelected: "RequestSelected",
     SearchCountUpdated: "SearchCountUpdated",
     SearchIndexUpdated: "SearchIndexUpdated"
 };