It seems like the fakebox to omnibox animation is broken, and that is probably caused by the NTP calculating the layout for the doodle and then removing the doodle? 

Per discussion, dropping to P2.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/135ca470f325795782d8fce531716d93399ba9e8

commit 135ca470f325795782d8fce531716d93399ba9e8
Author: Justin Cohen <justincohen@google.com>
Date: Fri Aug 31 14:32:18 2018

[ios] Use the NTP's HeaderViewController traitCollection.

CSHVC isn't a typical child view controller because it's loaded inside a
UICollectionView header.  Perhaps due to this, in some situations the CSHVC.view
traitCollections appear to be UIUserInterfaceSizeClassUnspecified.  Instead
use CSHVC directly.

Bug:  869262 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Ide7b1ecea10f056ef83004055122a91e08fd2fd9
Reviewed-on: https://chromium-review.googlesource.com/1196966
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588018}
[modify] https://crrev.com/135ca470f325795782d8fce531716d93399ba9e8/ios/chrome/browser/ui/content_suggestions/content_suggestions_header_view_controller.mm

Your change meets the bar and is auto-approved for M70. Please go ahead and merge the CL to branch 3538 manually. Please contact milestone owner if you have questions.
Owners: benmason@(Android), kariahda@(iOS), geohsu@(ChromeOS), abdulsyed@(Desktop)

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

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

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kariahda@ This was merged here: https://chromium-review.googlesource.com/c/chromium/src/+/1204933  Is there a problem with the merge-bot?

Yes merged correctly, Justin. Thanks for checking. We're getting a bug started for bugdroid.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f3712d6c683140cc585b6694ffc18b85cc40c9b6

commit f3712d6c683140cc585b6694ffc18b85cc40c9b6
Author: Justin Cohen <justincohen@google.com>
Date: Tue Sep 04 19:33:38 2018

[ios] Use the NTP's HeaderViewController traitCollection.

CSHVC isn't a typical child view controller because it's loaded inside a
UICollectionView header.  Perhaps due to this, in some situations the CSHVC.view
traitCollections appear to be UIUserInterfaceSizeClassUnspecified.  Instead
use CSHVC directly.

Bug:  869262 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Ide7b1ecea10f056ef83004055122a91e08fd2fd9
Reviewed-on: https://chromium-review.googlesource.com/1196966
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#588018}(cherry picked from commit 135ca470f325795782d8fce531716d93399ba9e8)
Reviewed-on: https://chromium-review.googlesource.com/1204933
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/branch-heads/3538@{#34}
Cr-Branched-From: 79f7c91a2b2a2932cd447fa6f865cb6662fa8fa6-refs/heads/master@{#587811}
[modify] https://crrev.com/f3712d6c683140cc585b6694ffc18b85cc40c9b6/ios/chrome/browser/ui/content_suggestions/content_suggestions_header_view_controller.mm

Verified on chrome beta version 70.0.3538.13 on iPad Mini with iOS 11.4.1 following steps mentioned in comment #0.  Text color is normal and looks good.