[Devtools] Added ability to add extension columns to network

third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js

Index: third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js
diff --git a/third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js b/third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js
index 2001eb2936f9424d3b3c932ba5effabb8408f2c6..5f26a5cfac156496a01c2ae9911db693842b3503 100644
--- a/third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js
+++ b/third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js
@@ -29,6 +29,9 @@ Network.NetworkLogViewColumns = class {
     /** @type {!Array.<!Network.NetworkLogViewColumns.Descriptor>} */
     this._columns = [];
 
+    /** @type {!Map<string, ?Network.NetworkColumnExtensionInterface>} */
+    this._columnExtensions = new Map();
+
     this._waterfallRequestsAreStale = false;
     this._waterfallScrollerWidthIsStale = true;
 
@@ -80,12 +83,13 @@ Network.NetworkLogViewColumns = class {
     this._columns = /** @type {!Array<!Network.NetworkLogViewColumns.Descriptor>} */ ([]);
     for (var currentConfigColumn of defaultColumns) {
       var columnConfig = /** @type {!Network.NetworkLogViewColumns.Descriptor} */ (
-          Object.assign(/** @type {!Object} */ ({}), defaultColumnConfig, currentConfigColumn));
+          Object.assign({}, defaultColumnConfig, currentConfigColumn));
       columnConfig.id = columnConfig.id;
       if (columnConfig.subtitle)
         columnConfig.titleDOMFragment = this._makeHeaderFragment(columnConfig.title, columnConfig.subtitle);
       this._columns.push(columnConfig);
     }
+    this._loadColumnExtensions();
     this._loadCustomColumnsAndSettings();
 
     this._popoverHelper = new UI.PopoverHelper(this._networkLogView.element);
@@ -327,6 +331,13 @@ Network.NetworkLogViewColumns = class {
   }
 
   /**
+   * @return {!Map<string, ?Network.NetworkColumnExtensionInterface>}
+   */
+  columnExtensions() {
+    return this._columnExtensions;
+  }
+
+  /**
    * @param {!Network.NetworkLogViewColumns.Descriptor} columnConfig
    */
   _toggleColumnVisibility(columnConfig) {
@@ -344,6 +355,43 @@ Network.NetworkLogViewColumns = class {
     this._persistantSettings.set(saveableSettings);
   }
 
+  _loadColumnExtensions() {
+    var extensions = self.runtime.extensions(Network.NetworkColumnExtensionInterface);
+    for (var i = 0; i < extensions.length; i++) {
+      var extension = extensions[i];
+      var title = extension.title();
+      var columnId = title.toLowerCase() + '-extension';
+
+      this._columnExtensions.set(columnId, null);
+      extension.instance().then(extensionInstanceResolved.bind(this, columnId));
+
+      var columnConfig = /** @type {!Network.NetworkLogViewColumns.Descriptor} */ (
+          Object.assign({}, Network.NetworkLogViewColumns._defaultColumnConfig, {
+            id: columnId,
+            title: title,
+            isResponseHeader: false,
+            isCustomHeader: false,
+            visible: true,
+            sortingFunction:
+                Network.NetworkRequestNode.ExtensionColumnComparator.bind(null, this._columnExtensions, columnId)
+          }));
+      const columnIndex = i + 1;
+      this._columns.splice(columnIndex, 0, columnConfig);
+      if (this._dataGrid)
+        this._dataGrid.addColumn(Network.NetworkLogViewColumns._convertToDataGridDescriptor(columnConfig), columnIndex);
+    }
+
+    /**
+     * @param {string} columnId
+     * @param {!Network.NetworkColumnExtensionInterface} instance
+     * @this {Network.NetworkLogViewColumns}
+     */
+    function extensionInstanceResolved(columnId, instance) {
+      this._columnExtensions.set(columnId, instance);
+      this._networkLogView.columnExtensionResolved();
+    }
+  }
+
   _loadCustomColumnsAndSettings() {
     var savedSettings = this._persistantSettings.get();
     var columnIds = Object.keys(savedSettings);
@@ -483,7 +531,7 @@ Network.NetworkLogViewColumns = class {
       return null;
 
     var columnConfig = /** @type {!Network.NetworkLogViewColumns.Descriptor} */ (
-        Object.assign(/** @type {!Object} */ ({}), Network.NetworkLogViewColumns._defaultColumnConfig, {
+        Object.assign({}, Network.NetworkLogViewColumns._defaultColumnConfig, {
           id: headerId,
           title: headerTitle,
           isResponseHeader: true,
@@ -814,3 +862,23 @@ Network.NetworkLogViewColumns.WaterfallSortIds = {
   Duration: 'duration',
   Latency: 'latency'
 };
+
+/**
+ * @interface
+ */
+Network.NetworkColumnExtensionInterface = function() {};
+
+Network.NetworkColumnExtensionInterface.prototype = {
+  /**
+   * @param {!SDK.NetworkRequest} request
+   * @return {string}
+   */
+  lookupColumnValue(request) {},
+
+  /**
+   * @param {!SDK.NetworkRequest} aRequest
+   * @param {!SDK.NetworkRequest} bRequest
+   * @return {number}
+   */
+  requestComparator(aRequest, bRequest) {}
+};