tree 8ba047b2e63925550ed617740908856a6f1f34f1
parent eb8d11c2b75160471800d82228102768610c3d0b
author Lijin Shen <lazzzis@google.com> 1657920787 +0000
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1657920787 +0000

Fix crash when back press is performed when no valid tab exists.

Before refactoring, app is moved to background if back press is
performed before valid tab exists.

This CL fixes the bug and adds some unittests.

This also fixes the bug that metric recording is missed when
mTabModelSelectorSupplier.get() returns null.

Bug: 1344873
Change-Id: Ic3e06ba98d0fa7f792af30494df2e9f47e1a6316
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3765453
Reviewed-by: Theresa Sullivan <twellington@chromium.org>
Commit-Queue: Lijin Shen <lazzzis@google.com>
Cr-Commit-Position: refs/heads/main@{#1024911}