Recognize 'optimizespeed' and 'optimizequality' for 'image-rendering' #13964
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In css_properties.json5 we list these keywords but we didn't recognize
them when parsing. Synchronize the two lists.
CSS Images L3 says the following about these two values:
"This property previously accepted the values optimizeSpeed and
optimizeQuality. These are now deprecated; a user agent must accept
them as valid values but must treat them as having the same behavior
as pixelated and auto respectively, and authors must not use them."
(https://drafts.csswg.org/css-images-3/#propdef-image-rendering)
Bug: 901669
Change-Id: Iecc4f38e711b14fa7b6fd4beb550abdaf99d5b46
Reviewed-on: https://chromium-review.googlesource.com/1319616
WPT-Export-Revision: 6cdc961469830b48c84ac20baf991c5c6cbc92be