The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8ee016ec326cfe6d28084200695d8c6c6e2024b5

commit 8ee016ec326cfe6d28084200695d8c6c6e2024b5
Author: Patrick Noland <pnoland@google.com>
Date: Wed Jan 24 11:44:53 2018

Add about://flags entry for scroll anchor serialization

Also fixes a crash encountered when enabling the flag for the first
time.

R: skobes@chromium.org, jochen@chromium.org
Bug:  804281 
Change-Id: Ie857f49cad146aac1fa20e77c13a697f06fa47b0
Reviewed-on: https://chromium-review.googlesource.com/878721
Commit-Queue: Patrick Noland <pnoland@google.com>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Steve Kobes <skobes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531501}
[modify] https://crrev.com/8ee016ec326cfe6d28084200695d8c6c6e2024b5/chrome/browser/about_flags.cc
[modify] https://crrev.com/8ee016ec326cfe6d28084200695d8c6c6e2024b5/chrome/browser/flag_descriptions.cc
[modify] https://crrev.com/8ee016ec326cfe6d28084200695d8c6c6e2024b5/chrome/browser/flag_descriptions.h
[modify] https://crrev.com/8ee016ec326cfe6d28084200695d8c6c6e2024b5/content/child/runtime_features.cc
[modify] https://crrev.com/8ee016ec326cfe6d28084200695d8c6c6e2024b5/content/public/common/content_features.cc
[modify] https://crrev.com/8ee016ec326cfe6d28084200695d8c6c6e2024b5/content/public/common/content_features.h
[modify] https://crrev.com/8ee016ec326cfe6d28084200695d8c6c6e2024b5/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp
[modify] https://crrev.com/8ee016ec326cfe6d28084200695d8c6c6e2024b5/third_party/WebKit/Source/platform/exported/WebRuntimeFeatures.cpp
[modify] https://crrev.com/8ee016ec326cfe6d28084200695d8c6c6e2024b5/third_party/WebKit/public/platform/WebRuntimeFeatures.h
[modify] https://crrev.com/8ee016ec326cfe6d28084200695d8c6c6e2024b5/tools/metrics/histograms/enums.xml

Your change meets the bar and is auto-approved for M65. Please go ahead and merge the CL to branch 3325 manually. Please contact milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), bhthompson@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Tested the issue on Mac 10.13.3, Windows 10 and Ubuntu 14.04 using Chrome version M66 - 66.0.3331.0 as per the issue mentioned in original comment. Observed that issue is working as intended (Able to enable the flag #enable-scroll-anchor-serialization in chrome://flags and relaunch the Chrome without any crash). Hence adding TE-Verified label. Attached the screencast for reference.

Deleted: 804281.webm 4.1 MB

	804281.webm 4.1 MB View Download

Pls merge your change to M65 branch 3325 ASAP so we can pick it up for next M65 dev release. Thank you.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b41cf04751ef011db52232e3ff365fe63e415583

commit b41cf04751ef011db52232e3ff365fe63e415583
Author: Patrick Noland <pnoland@google.com>
Date: Thu Jan 25 17:00:35 2018

Add about://flags entry for scroll anchor serialization

Also fixes a crash encountered when enabling the flag for the first
time.

R: skobes@chromium.org, jochen@chromium.org
Bug:  804281 
Change-Id: Ie857f49cad146aac1fa20e77c13a697f06fa47b0
Reviewed-on: https://chromium-review.googlesource.com/878721
Commit-Queue: Patrick Noland <pnoland@google.com>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Steve Kobes <skobes@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#531501}(cherry picked from commit 8ee016ec326cfe6d28084200695d8c6c6e2024b5)
Reviewed-on: https://chromium-review.googlesource.com/887141
Reviewed-by: Patrick Noland <pnoland@google.com>
Cr-Commit-Position: refs/branch-heads/3325@{#91}
Cr-Branched-From: bc084a8b5afa3744a74927344e304c02ae54189f-refs/heads/master@{#530369}
[modify] https://crrev.com/b41cf04751ef011db52232e3ff365fe63e415583/chrome/browser/about_flags.cc
[modify] https://crrev.com/b41cf04751ef011db52232e3ff365fe63e415583/chrome/browser/flag_descriptions.cc
[modify] https://crrev.com/b41cf04751ef011db52232e3ff365fe63e415583/chrome/browser/flag_descriptions.h
[modify] https://crrev.com/b41cf04751ef011db52232e3ff365fe63e415583/content/child/runtime_features.cc
[modify] https://crrev.com/b41cf04751ef011db52232e3ff365fe63e415583/content/public/common/content_features.cc
[modify] https://crrev.com/b41cf04751ef011db52232e3ff365fe63e415583/content/public/common/content_features.h
[modify] https://crrev.com/b41cf04751ef011db52232e3ff365fe63e415583/third_party/WebKit/Source/core/layout/ScrollAnchor.cpp
[modify] https://crrev.com/b41cf04751ef011db52232e3ff365fe63e415583/third_party/WebKit/Source/platform/exported/WebRuntimeFeatures.cpp
[modify] https://crrev.com/b41cf04751ef011db52232e3ff365fe63e415583/third_party/WebKit/public/platform/WebRuntimeFeatures.h
[modify] https://crrev.com/b41cf04751ef011db52232e3ff365fe63e415583/tools/metrics/histograms/enums.xml

Verified the fix on Mac 10.12.6, Win-10 and Ubuntu 14.04 using Chrome dev version #65.0.3325.31 as per the comment #0 and issue description.
Attaching screen cast for reference.
Observed that ScrollAnchorSerialization is added to chrome://flags.
Hence, the fix is working as expected. 
Adding the verified labels.

Thanks...!!

Deleted: 804281.mp4 1.1 MB

	804281.mp4 1.1 MB View Download