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

Source/devtools/front_end/network/NetworkLogView.js

Index: Source/devtools/front_end/network/NetworkLogView.js
diff --git a/Source/devtools/front_end/network/NetworkLogView.js b/Source/devtools/front_end/network/NetworkLogView.js
index 5914e0f8d2b48631f0a6ca2dccc463faf9331f6b..f4c651bc4ef8f7b19bddcb2b264cb241592824b1 100644
--- a/Source/devtools/front_end/network/NetworkLogView.js
+++ b/Source/devtools/front_end/network/NetworkLogView.js
@@ -731,6 +731,7 @@ WebInspector.NetworkLogView.prototype = {
         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"));
@@ -829,7 +830,10 @@ WebInspector.NetworkLogView.prototype = {
         this._updateSummaryBar();
     },
 
-    _onRecordButtonClicked: function()
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _onRecordButtonClicked: function(event)
     {
         if (!this._recordButton.toggled)
             this._reset();
@@ -845,6 +849,18 @@ WebInspector.NetworkLogView.prototype = {
         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);
@@ -888,11 +904,25 @@ WebInspector.NetworkLogView.prototype = {
     /**
      * @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.