Generalize valgrind suppressions for NV driver.

Review URL: https://codereview.chromium.org/723603003
Followup: remove unnecessary SkTRefArray

BUG=skia:

Review URL: https://codereview.chromium.org/719113004
Make GrGpuResource::gpuMemorySize non-virtual w/ onGpuMemorySize virtual impl

BUG=skia:2889

Review URL: https://codereview.chromium.org/702413003
Rebaseline for s4-Debug for 6fee786210bd2.
Fix use of NULL ptr in GrContext::drawRect

BUG=skia:3122
TBR=mtklein@google.com

Review URL: https://codereview.chromium.org/724443002
cleanup comments

BUG=skia:

Review URL: https://codereview.chromium.org/715233005
Reland "Move from libstlport to libc++ for Android framework builds" (patchset #1 id:1 of https://codereview.chromium.org/718793003/)

> Original issue's description:
> > Move from libstlport to libc++ for Android framework builds
> >
> > Committed: https://skia.googlesource.com/skia/+/ce259510a738fab05a0d456440104f5aba1c9d72
>
> TBR=tomhudson@google.com,djsollen@google.com
> NOTREECHECKS=true
> NOTRY=true
>
> Committed: https://skia.googlesource.com/skia/+/3c3fe7ce4893204eb8bcf885e8a1d539763bca5d

TBR=tomhudson@google.com,djsollen@google.com
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/717303002
Rebase gm's for first time that were in no-comparion

TBR=
BUG=skia:

Review URL: https://codereview.chromium.org/715363006