fix ios build

NOTREECHECKS=true
NOTRY=true
TBR=

Review URL: https://codereview.chromium.org/641063002
try again to fix ios build

TBR=
NOTRY=true
NOTREECHECKS=true

Review URL: https://codereview.chromium.org/638403002
Add SkBBoxHierarchy::reserve() as an optional size hint.

I want to play around with how SkTileGrid stores its tiles.  Having a
cap on the number of insert() calls can be pretty handy.

While I'm at it, I gave flush() a default empty impl.  Like reserve(),
it's really an optional hook for subclasses.

BUG=skia:

Review URL: https://codereview.chromium.org/639933003
rename command line flag to avoid conflict, use very verbose

TBR=
NOTRY=true
NOTREECHECKS=true

Review URL: https://codereview.chromium.org/645573003
gl programs rewrite

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/07a255310aca9f3e83bf741dc663a58818ad681c

Review URL: https://codereview.chromium.org/628633003