AutoSize TextView - correct pixel transformations

When configuring a TextView to auto-size via min/max/granularity
do the calculations in float pixels and only convert to int (via
rounding, see TypedArray#getDimensionPixelSize) to produce the
final text size values to be used by the auto-size algorithm.
This is because the previous version where the values were
initially directly converted to pixels and only after used in
calculations was losing precision and was not consistent with how
we deal with preset configuration (and the developer
expectations).

Practically

textView1.setAutoSizeTextTypeUniformWithConfiguration(10, 20, 2,
        TypedValue.COMPLEX_UNIT_SP)

and

textView2.setAutoSizeTextTypeUniformWithPresetSizes(
         new int[] {10, 12, 14, 16, 18, 20},
         TypedValue.COMPLEX_UNIT_SP);

produce exactly the same values in pixels to choose from when
auto-sizing (on any device) =>
(TextView#getAutoSizeTextAvailableSizes())

Bug: 38185233
Bug: 37265610
Test: attached in the same topic
Change-Id: I95cbbf4674e98f080d7752ae350df26b4adf31b4