Performance: Move GPU code to GlyphRun and inline

Move the GPU glyph drawing code into the glyph run drawing translation
unit. Inline the per glyph/path functions. This results in about 15%
speedup.

Change-Id: Iee98140d668bb3cbcb77dd5a1fb2f83778f79d12
Reviewed-on: https://skia-review.googlesource.com/145889
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
4 files changed