Implement support for rendering color emoji on Windows

This change adds support to the DirectWrite scaler context
for detection of color fonts. If it detects a color font and
the glyph is a color glyph, it will use DirectWrite's
TranslateColorGlyphRun API and generate an image of the
glyph that can then be rendered.

Chromium tests: https://codereview.chromium.org/2003853002

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Review-Url: https://codereview.chromium.org/1984943002
3 files changed