Lookup glyphs based on character code and language tag.

This is particularly important on Android where we expect the
FontManager to return different glyphs for the same character code
depending on language.

BUG=skia:2829
R=bungeman@google.com, tomhudson@google.com

Author: djsollen@google.com

Review URL: https://codereview.chromium.org/492763003
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