The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/921c10a1210ad4db91abf5a2cdf115598c3e875f

commit 921c10a1210ad4db91abf5a2cdf115598c3e875f
Author: Hayato Ito <hayato@chromium.org>
Date: Mon Nov 27 08:04:29 2017

[IncrementalShadowDOM] Update bug id for a test which uses <content> element in UA shadow root

TBR=kochi,rakina

Bug:  788617 
Change-Id: I0154b2bf689f7d4f1cc6d57555c70c598368a8a6
Reviewed-on: https://chromium-review.googlesource.com/790036
Commit-Queue: Hayato Ito <hayato@chromium.org>
Reviewed-by: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519240}
[modify] https://crrev.com/921c10a1210ad4db91abf5a2cdf115598c3e875f/third_party/WebKit/LayoutTests/TestExpectations

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2ce1fe0f2b58d9eeb7d2bf78d988f618b56d31e9

commit 2ce1fe0f2b58d9eeb7d2bf78d988f618b56d31e9
Author: Takayoshi Kochi <kochi@chromium.org>
Date: Tue Jan 16 09:36:46 2018

Covnert internals.createUserAgehtShadowRoot() to create V1 shadow

This is a part of V0 UA shadow root conversion to V1.
 crbug.com/788617  drag and drop layout test is also fixed
with this CL.

Bug:  788617 ,  787717 
Change-Id: I4fcc6b6ebe017d443c486108209993e4f8bf39f4
Reviewed-on: https://chromium-review.googlesource.com/863843
Reviewed-by: Hayato Ito <hayato@chromium.org>
Commit-Queue: Takayoshi Kochi <kochi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#529389}
[modify] https://crrev.com/2ce1fe0f2b58d9eeb7d2bf78d988f618b56d31e9/third_party/WebKit/LayoutTests/TestExpectations
[modify] https://crrev.com/2ce1fe0f2b58d9eeb7d2bf78d988f618b56d31e9/third_party/WebKit/LayoutTests/fast/dom/shadow/drag-and-drop-in-user-agent-shadow.html
[modify] https://crrev.com/2ce1fe0f2b58d9eeb7d2bf78d988f618b56d31e9/third_party/WebKit/Source/core/testing/Internals.cpp