[Devtools] Added ability to add extension columns to network

third_party/WebKit/Source/devtools/front_end/network_group_lookup/NetworkProductGroupLookup.js

Index: third_party/WebKit/Source/devtools/front_end/network_group_lookup/NetworkProductGroupLookup.js
diff --git a/third_party/WebKit/Source/devtools/front_end/network_group_lookup/NetworkProductGroupLookup.js b/third_party/WebKit/Source/devtools/front_end/network_group_lookup/NetworkProductGroupLookup.js
index e8594675bb6c29548a594c973561218d840e389c..d76b01d2e719b96c211c3d92d1257ca6be8ee497 100644
--- a/third_party/WebKit/Source/devtools/front_end/network_group_lookup/NetworkProductGroupLookup.js
+++ b/third_party/WebKit/Source/devtools/front_end/network_group_lookup/NetworkProductGroupLookup.js
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
+ * @implements {Network.NetworkColumnExtensionInterface}
  * @implements {Network.NetworkGroupLookupInterface}
  */
 NetworkGroupLookup.NetworkProductGroupLookup = class {
@@ -13,4 +14,12 @@ NetworkGroupLookup.NetworkProductGroupLookup = class {
   lookup(request) {
     return ProductRegistry.nameForUrl(request.parsedURL);
   }
+  /**
+   * @override
+   * @param {!SDK.NetworkRequest} request
+   * @return {string}
+   */
+  lookupColumnValue(request) {
+    return this.lookup(request) || '';
+  }
 };