fix(textures): adjust premultiplyAlpha handling for Safari 8 (movistar) compatibility

[pecoram]

No description provided.

[chiefcll]

I'm fairly certain this is wrong.

Recommendation
Request changes. As written, this trades a movistar bug for a double-premultiply regression on every honored device, and leaves the producer (premultiplyAlpha = upload intent) and consumer (WebGlCtxTexture) contracts inconsistent. Preferred paths, in order:

Fix movistar via config (premultiplyAlphaHonored: false/'auto') with no source change

You should review this
#52

[pecoram]

I'm fairly certain this is wrong.

Recommendation Request changes. As written, this trades a movistar bug for a double-premultiply regression on every honored device, and leaves the producer (premultiplyAlpha = upload intent) and consumer (WebGlCtxTexture) contracts inconsistent. Preferred paths, in order:

Fix movistar via config (premultiplyAlphaHonored: false/'auto') with no source change

You should review this #52

Keep in mind that we've released it (with a patch) and haven't received any reports yet. We tested #52, and it didn't work as well.