CL is https://chromium-review.googlesource.com/c/chromium/src/+/1144938

Verified on canary 70.0.3502.0

Approved!

CL had the wrong bug number, but these are the merge headers:

[iOS] Remove content flicker when exiting tab grid.

The tab grid animation includes a cross-fade from the grid cell's snapshot
to the tab's content view. In cases where these views are identical, the
crossfade was introducing a flicker.

This CL has the TabGridViewController track its initial frame, and it will
mark the animation layout if it has changed (due to rotation). The animation
will only crossfade the content if this change has happened.

The timing of the crossfade is also changed.


Bug: 865440
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I838641fbd069222aae98f541ec8b0b7515f1529c
Reviewed-on: https://chromium-review.googlesource.com/1144938
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Mark Cogan <marq@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#576832}(cherry picked from commit c386ff1919f8670e349764827947ff6a876df2fc)
Reviewed-on: https://chromium-review.googlesource.com/1150381
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/branch-heads/3497@{#103}
Cr-Branched-From: 271eaf50594eb818c9295dc78d364aea18c82ea8-refs/heads/master@{#576753}