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In CSS Color 4, RGB() and RGBA() were synonymized, along with allowing
whitespace to separate the channels instead of commas, introducing
a backslash as a new way to separate the alpha parameter, and allowing
percent values for the alpha parameter. This updates our parsing
behavior to reflect these changes, and enables now-passing WPT tests.
The new spec is at https://drafts.csswg.org/css-color/#rgb-functions.

Bug: 788707
Change-Id: Ib0f29009e477fc88cd1ceda03ff0ebb947a36ea3
Reviewed-on: https://chromium-review.googlesource.com/798831
Commit-Queue: Chris Nardi <hichris123@gmail.com>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521703}