[Minimal UI] Increase size of controls to comply with Android GAR

The system UI app header can sometimes be 40dp tall but app header
controls need to be at least 48dp tall to comply with Android GAR.

If the system UI header is <48dp tall this CL will increase the size of
the web app header layout to be 48dp and add insets to the minimal UI
control buttons so that the icons are center-aligned with the system UI
controls.

If the system UI header is >=48dp, then the size of the web app header
will not be adjusted but the minimal UI controls will be center-aligned
within the web app header.

https://hsv.googleplex.com/6323490360655872

Bug: 410798227
Change-Id: I2ec06149b012ef86e5fc3522a1f63b6557d50864
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6490429
Reviewed-by: Vlad Korotkevich <vkorotkevich@google.com>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Adam Raine <asraine@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1459747}