The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/222cced63f41cf7214483734f4c0b775f7659a97

commit 222cced63f41cf7214483734f4c0b775f7659a97
Author: allada <allada@chromium.org>
Date: Sat Mar 18 00:26:33 2017

[Devtools] Added ability to add extension columns to network

This patch introduces the ability to add extension columns and it bound
the networkGroupingRequests experiment to it (only shown when experiment
is on right now).

See: http://imgur.com/a/WOUqw

R=caseq
BUG= 701973 

Review-Url: https://codereview.chromium.org/2756583002
Cr-Commit-Position: refs/heads/master@{#457910}

[modify] https://crrev.com/222cced63f41cf7214483734f4c0b775f7659a97/third_party/WebKit/Source/devtools/front_end/network/NetworkDataGridNode.js
[modify] https://crrev.com/222cced63f41cf7214483734f4c0b775f7659a97/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js
[modify] https://crrev.com/222cced63f41cf7214483734f4c0b775f7659a97/third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js
[modify] https://crrev.com/222cced63f41cf7214483734f4c0b775f7659a97/third_party/WebKit/Source/devtools/front_end/network_group_lookup/NetworkProductGroupLookup.js
[modify] https://crrev.com/222cced63f41cf7214483734f4c0b775f7659a97/third_party/WebKit/Source/devtools/front_end/network_group_lookup/module.json