Dirty mipmaps whenever we upload new contents for a texture.

Found a bug where we rendered with two identically sized textures. On
the first frame, everything worked. On subsequent frames, we would get
the other texture from the cache, causing us to inherit the mips from
the wrong texture.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1836143003

Review URL: https://codereview.chromium.org/1836143003
1 file changed