Combine GPU drawing routines into one large routine

Combining drawDFGlyphRun, DrawBmpGlyphRunAsPaths, and DrawBmpGlyphRun
into regenerateGlyphRunList represents the code that must be
encapsulated into SkGlyphRunListDrawer.

Change-Id: Ia0a710200d8ca7f66495d220698915d87de5a079
Reviewed-on: https://skia-review.googlesource.com/144301
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
2 files changed