Don't apply 2DScaleTransformWithCompositedDescendants on text

2DScaleTransformWithCompositedDescendants will cause bluriness of text
due to
1. non ideal raster scale;
2. loss of eligibility of raster translation for pixel alignment;
3. loss of LCD text.

Nevertheless, if a non-integral scale does apply to adjacent layers
containing text, if the layers have opaque backgrounds (which is the
most common case where there might be visible seams between layers),
our CalculateClearForOpaqueRasterRects() [1] mechanism will eliminate
the seams without needing 2DScaleTransformWithCompositedDescendants.

[1] https://source.chromium.org/chromium/chromium/src/+/main:cc/paint/clear_for_opaque_raster.h;drc=3f7a9d89de4c434583d520384b01ce87178ce888;l=25

Bug: 40084005
Change-Id: I2012afb45aae2974d81451f6c22c953e23fcde1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6333986
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1429576}