Autosize Label TextCompat pre android 8 doesn't autosize text

[AdamDiament]

Xamarin.Android Version (eg: 6.0):

7 and below have the issue. 8+ works as expected.

Operating System & Version (eg: Mac OSX 10.11):

Windows 10

Support Libraries Version (eg: 23.3.0):

using Android.Support.V4.Widget.TextViewCompat; (nuget package for compat not explicitly installed. I tried installing both v4 and v7 and it made no difference)

Describe your Issue:

TextViewCompat.SetAutoSizeTextTypeUniformWithConfiguration does not work as expected on android pre-8, when used in a custom renderer in a xamarin forms project. According to the docs it should provide backwards compatibility to android 4+. Font size should shrink as to not overflow the text bounds, it doesn't.

Steps to Reproduce (with link to sample solution if possible):

Sample solution zip: (rebuild as bin/obj folders were deleted).
TestAutoSizeTextView.zip

1. Rebuild the project and start on an Android 8 or higher device. The page loads and you see this screen with the text resizing correctly in the three labels with Aqua backgrounds.

2. Load the same project on an android 7 device. The following behaviour is seen, text doesn't resize as expected.

Include any relevant Exception Stack traces, build logs, adb logs:

N/A