The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c2a89e2c51ea4bb1b8de6aa40acc5a65d0f6c8f9

commit c2a89e2c51ea4bb1b8de6aa40acc5a65d0f6c8f9
Author: Gauthier Ambard <gambard@chromium.org>
Date: Tue Aug 28 09:54:29 2018

[iOS] Fix toolbar updater of rotation

This CL fixes the toolbar height calculated by the
LegacyToolbarUIUpdater on rotation. Previously the updater wasn't
notified on the rotation, leading to a wrong toolbar height after
rotation.

Bug:  849206 ,  876275 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I33c0f0ed4c535f2f6fbf9e089e0f38b00f6692e0
Reviewed-on: https://chromium-review.googlesource.com/1188571
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586636}
[modify] https://crrev.com/c2a89e2c51ea4bb1b8de6aa40acc5a65d0f6c8f9/ios/chrome/browser/ui/browser_view_controller.mm
[modify] https://crrev.com/c2a89e2c51ea4bb1b8de6aa40acc5a65d0f6c8f9/ios/chrome/browser/ui/toolbar/legacy_toolbar_ui_updater.h
[modify] https://crrev.com/c2a89e2c51ea4bb1b8de6aa40acc5a65d0f6c8f9/ios/chrome/browser/ui/toolbar/legacy_toolbar_ui_updater.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/37ef13f45bc1a02808167c1db8e9687ec3e4a386

commit 37ef13f45bc1a02808167c1db8e9687ec3e4a386
Author: Gauthier Ambard <gambard@chromium.org>
Date: Wed Sep 19 08:04:18 2018

[iOS] Fix fullscreenOutOfWeb for NTP

This CL fixes the fullscreen implementation living outside of web for
the NTP and other scrolling issues on web page.
It also fixes the animation of the resizing when the animator is
triggered.

Bug:  849206 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I8a13b88af6808472ef84ef6902c75c398451c961
Reviewed-on: https://chromium-review.googlesource.com/1195487
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592340}
[modify] https://crrev.com/37ef13f45bc1a02808167c1db8e9687ec3e4a386/ios/chrome/browser/ui/BUILD.gn
[modify] https://crrev.com/37ef13f45bc1a02808167c1db8e9687ec3e4a386/ios/chrome/browser/ui/browser_view_controller.mm
[modify] https://crrev.com/37ef13f45bc1a02808167c1db8e9687ec3e4a386/ios/chrome/browser/ui/fullscreen/BUILD.gn
[modify] https://crrev.com/37ef13f45bc1a02808167c1db8e9687ec3e4a386/ios/chrome/browser/ui/fullscreen/fullscreen_mediator.mm
[modify] https://crrev.com/37ef13f45bc1a02808167c1db8e9687ec3e4a386/ios/chrome/browser/ui/fullscreen/fullscreen_web_view_resizer.h
[modify] https://crrev.com/37ef13f45bc1a02808167c1db8e9687ec3e4a386/ios/chrome/browser/ui/fullscreen/fullscreen_web_view_resizer.mm
[modify] https://crrev.com/37ef13f45bc1a02808167c1db8e9687ec3e4a386/ios/chrome/browser/ui/fullscreen/fullscreen_web_view_resizer_unittest.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ae0aa26508cc424b3928b1ed4bf49db846264f36

commit ae0aa26508cc424b3928b1ed4bf49db846264f36
Author: Gauthier Ambard <gambard@chromium.org>
Date: Wed Sep 19 08:52:28 2018

[iOS] Fix the fullscreen scrolling offset

The scrolling offset of the WKWebView should be handled in the
FullscreenResizer, not in Web when the flag is enabled.
This wasn't the case before because the flag was created in the middle
of the refactoring of the existing function.

Bug:  849206 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I89675ee01c43fe8eecda56f690d08ffb4eabe263
Reviewed-on: https://chromium-review.googlesource.com/1196368
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592349}
[modify] https://crrev.com/ae0aa26508cc424b3928b1ed4bf49db846264f36/ios/chrome/browser/ui/fullscreen/fullscreen_web_view_resizer.mm
[modify] https://crrev.com/ae0aa26508cc424b3928b1ed4bf49db846264f36/ios/web/web_state/ui/crw_web_view_content_view.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/130703ac5940ec802fcf22d9ed3bef6320f061e1

commit 130703ac5940ec802fcf22d9ed3bef6320f061e1
Author: Gauthier Ambard <gambard@chromium.org>
Date: Wed Sep 19 09:04:04 2018

[iOS] Don't always compensate fullscreen resizing

This CL changes the way the fullscreen resizer is compensating the frame
changes by updating the content offset of the scroll view.
When the WebState is set up the first time, the content offset shouldn't
be updated.

Bug:  849206 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Ibface28fd9d0459c411aa74de6bb3075c62eb004
Reviewed-on: https://chromium-review.googlesource.com/1225981
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592350}
[modify] https://crrev.com/130703ac5940ec802fcf22d9ed3bef6320f061e1/ios/chrome/browser/ui/fullscreen/fullscreen_web_view_resizer.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8240b0090f2fb5e4bd9a35e1ecbd761786d00b58

commit 8240b0090f2fb5e4bd9a35e1ecbd761786d00b58
Author: Gauthier Ambard <gambard@chromium.org>
Date: Tue Sep 25 09:09:26 2018

[iOS] Update snapshot for FullscreenOutOfWeb

The snapshot of the page are taken based on the WebState's view frame.
When Fullscreen is done out of Web, the WebState's view frame is changed
based on the fullscreen progress. So when it is enabled, the snapshot
should be taken relatively to its superview.

Bug:  849206 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I13f2ad0377a6088467dd289d0cbadb7106e08019
Reviewed-on: https://chromium-review.googlesource.com/1238255
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593869}
[modify] https://crrev.com/8240b0090f2fb5e4bd9a35e1ecbd761786d00b58/ios/chrome/browser/snapshots/snapshot_generator.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ab8fe8a52e6cf13e2eee4ab328be85577dd57935

commit ab8fe8a52e6cf13e2eee4ab328be85577dd57935
Author: Justin Cohen <justincohen@google.com>
Date: Wed Oct 03 14:18:32 2018

[ios] Correct new tab animation with fullscreen features enabled.

Also note that -correctMissingSafeArea in content suggestions VC can be
bypassed when the BrowserContainerFullscreen feature is enabled.

BUG:  849206 ,  836730 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Id876a66b1509cdec64a645b59c296186c31fa8e1
Reviewed-on: https://chromium-review.googlesource.com/c/1255984
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596203}
[modify] https://crrev.com/ab8fe8a52e6cf13e2eee4ab328be85577dd57935/ios/chrome/browser/ui/browser_view_controller.mm
[modify] https://crrev.com/ab8fe8a52e6cf13e2eee4ab328be85577dd57935/ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.mm

Verified on 71.0.3572.0 Canary, iPhone X  iOS 11.4.1
Looks good.
https://drive.google.com/file/d/1QhdHnTrBhxoySgdrWw0-WBwBLC3EgTQI/view