[DevTools] Network: prefetch resource content when "preserveLog" is on.

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) 2010, 2011, 2012, 2013, 2014 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 713 matching lines @@
         this._recordButton.addEventListener("click", this._onRecordButtonClicked, this);
 
         this._clearButton = new WebInspector.StatusBarButton(WebInspector.UIString("Clear"), "clear-status-bar-item");
         this._clearButton.addEventListener("click", this._reset, this);
 
         this._largerRequestsButton = new WebInspector.StatusBarButton(WebInspector.UIString("Use small resource rows."), "network-larger-resources-status-bar-item");
         this._largerRequestsButton.toggled = WebInspector.settings.resourcesLargeRows.get();
         this._largerRequestsButton.addEventListener("click", this._toggleLargerRequests, this);
 
         this._preserveLogCheckbox = new WebInspector.StatusBarCheckbox(WebInspector.UIString("Preserve log"));
+        this._preserveLogCheckbox.inputElement.addEventListener("change", this._preserveLogCheckboxChanged.bind(this));
         this._preserveLogCheckbox.element.title = WebInspector.UIString("Do not clear log on page reload / navigation.");
 
         this._disableCacheCheckbox = new WebInspector.StatusBarCheckbox(WebInspector.UIString("Disable cache"));
         WebInspector.SettingsUI.bindCheckbox(this._disableCacheCheckbox.inputElement, WebInspector.settings.cacheDisabled);
         this._disableCacheCheckbox.element.title = WebInspector.UIString("Disable cache (while DevTools is open).");
     },
 
     /**
      * @param {!WebInspector.Event} event
      */
@@ skipping 78 matching lines @@
             this._updateDividersIfNeeded();
             var nodes = this._nodesByRequestId.valuesArray();
             for (var i = 0; i < nodes.length; ++i)
                 nodes[i].refreshGraph();
         }
 
         this._staleRequestIds = {};
         this._updateSummaryBar();
     },
 
-    _onRecordButtonClicked: function()
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _onRecordButtonClicked: function(event)
     {
         if (!this._recordButton.toggled)
             this._reset();
         this._toggleRecordButton(!this._recordButton.toggled);
     },
 
     /**
      * @param {boolean} toggled
      */
     _toggleRecordButton: function(toggled)
     {
         this._recordButton.toggled = toggled;
         this._recordButton.title = toggled ? WebInspector.UIString("Stop Recording Network Log") : WebInspector.UIString("Record Network Log");
     },
 
+    /**
+     * @param {?Event} event
+     */
+    _preserveLogCheckboxChanged: function(event)
+    {
+        if (!this._preserveLogCheckbox.checked())
+            return;
+        var requests = this._nodesByRequestId.valuesArray().map(function(node) { return node.request(); });
+        for (var i = 0; i < requests.length; ++i)
+            this._forceContentLoading(requests[i]);
+    },
+
     _reset: function()
     {
         this.dispatchEventToListeners(WebInspector.NetworkLogView.EventTypes.ViewCleared);
 
         this._clearSearchMatchedList();
         if (this._popoverHelper)
             this._popoverHelper.hidePopover();
 
         if (this._calculator)
             this._calculator.reset();
@@ skipping 23 matching lines @@
     {
         if (this._recordButton.toggled) {
             var request = /** @type {!WebInspector.NetworkRequest} */ (event.data);
             this._appendRequest(request);
         }
     },
 
     /**
      * @param {!WebInspector.NetworkRequest} request
      */
+    _forceContentLoading: function(request)
+    {
+        /**
+         * @param {?string} content
+         */
+        function dummyContentCallback(content) { }
+
+        request.requestContent(dummyContentCallback);
+    },
+
+    /**
+     * @param {!WebInspector.NetworkRequest} request
+     */
     _appendRequest: function(request)
     {
         var node = new WebInspector.NetworkDataGridNode(this, request);
         node[WebInspector.NetworkLogView._isFilteredOutSymbol] = true;
         node[WebInspector.NetworkLogView._isMatchingSearchQuerySymbol] = false;
+        // TODO: _forceContentLoading
 
         // In case of redirect request id is reassigned to a redirected
         // request and we need to update _nodesByRequestId and search results.
         var originalRequestNode = this._nodesByRequestId.get(request.requestId);
         if (originalRequestNode)
             this._nodesByRequestId.set(originalRequestNode.request().requestId, originalRequestNode);
         this._nodesByRequestId.set(request.requestId, node);
 
         // Pull all the redirects of the main request upon commit load.
         if (request.redirects) {
@@ skipping 987 matching lines @@
     return request.finished;
 }
 
 WebInspector.NetworkLogView.EventTypes = {
     ViewCleared: "ViewCleared",
     RowSizeChanged: "RowSizeChanged",
     RequestSelected: "RequestSelected",
     SearchCountUpdated: "SearchCountUpdated",
     SearchIndexUpdated: "SearchIndexUpdated"
 };