Atlas generation numbers is not tracking plot changes -- disable it
Atlas generation numbers is not tracking plot changes -- disable it

The atlas generation number is used avoid checking if each glyph has
a valid plot location. If the atlas generation number ever misses
an eviction of a plot, then some glyph atlas coordinates will be considered
valid when in fact they are stale.

Fix: Always check the texture coordinates of every glyph. Don't use the
atlas generation numbering to reduce work.

Bug: chromium:1045016
Change-Id: I287d3bbcd0a5d679327002595ae50e0f775dca12
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/267096
Reviewed-by: Jim Van Verth <509afb0bfbb23ecaaf1fb3323209f531b45e75a6@google.com>
Commit-Queue: Herb Derby <9e12a3d2bbf73546e47cc9958f6ba8f3215b7eaf@google.com>

google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia