The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8309530bfed7acbabd6a64adc53c5c7f2102e745

commit 8309530bfed7acbabd6a64adc53c5c7f2102e745
Author: allada <allada@chromium.org>
Date: Tue Mar 28 00:53:30 2017

[Devtools] DataGrid & ViewportDataGrid now should resetNode for children

This patch should ensure that ViewportDataGrid and DataGrid play nice
with eachother when removing and adding items to the dom. The core issue
was that _depth in DataGrid was not being cleared when handled by
ViewportDataGrid. This is not a long term solution, but is something
meant to let us get by until we can refactor DataGrid.

R=caseq,dgozman
BUG= 696109 

Review-Url: https://codereview.chromium.org/2781593003
Cr-Commit-Position: refs/heads/master@{#459959}

[add] https://crrev.com/8309530bfed7acbabd6a64adc53c5c7f2102e745/third_party/WebKit/LayoutTests/http/tests/inspector-unit/datagrid-items-attached-to-dom-expected.txt
[add] https://crrev.com/8309530bfed7acbabd6a64adc53c5c7f2102e745/third_party/WebKit/LayoutTests/http/tests/inspector-unit/datagrid-items-attached-to-dom.js
[add] https://crrev.com/8309530bfed7acbabd6a64adc53c5c7f2102e745/third_party/WebKit/LayoutTests/http/tests/inspector-unit/viewport-datagrid-items-attached-to-dom-expected.txt
[add] https://crrev.com/8309530bfed7acbabd6a64adc53c5c7f2102e745/third_party/WebKit/LayoutTests/http/tests/inspector-unit/viewport-datagrid-items-attached-to-dom.js
[add] https://crrev.com/8309530bfed7acbabd6a64adc53c5c7f2102e745/third_party/WebKit/LayoutTests/http/tests/inspector-unit/viewport-datagrid-items-expandable-attached-to-dom-expected.txt
[add] https://crrev.com/8309530bfed7acbabd6a64adc53c5c7f2102e745/third_party/WebKit/LayoutTests/http/tests/inspector-unit/viewport-datagrid-items-expandable-attached-to-dom.js
[modify] https://crrev.com/8309530bfed7acbabd6a64adc53c5c7f2102e745/third_party/WebKit/Source/devtools/front_end/data_grid/DataGrid.js
[modify] https://crrev.com/8309530bfed7acbabd6a64adc53c5c7f2102e745/third_party/WebKit/Source/devtools/front_end/data_grid/ViewportDataGrid.js