Remove advance only mode from SkGlyph.

SkGlyph would be initialized with advances, but the bounding box, etc.
would be calculated later. Initialize the glyphs everything except, image
and path data.

+ Clean up private: section.

Change-Id: I016e820563690fc4a74c85cd73442675119dacbf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/219524
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Herb Derby <herb@google.com>
2 files changed