Add field to OmniboxIconView for tests

We want to check that the view is showing some icon in tests. This
exposes a readonly property for that case.

Bug: 963894
Change-Id: I2649ad4d4615cb41b4589cab6142978f747b97cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1627375
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Cr-Commit-Position: refs/heads/master@{#663050}
2 files changed