Ignore failure on internal bot

BUG=skia:3023
TBR=egdaniel@google.com

Review URL: https://codereview.chromium.org/640063004
Picture shader resource caching.

Replace the current/naive shader caching mechanism with a more general
implementation based on SkResourceCache.

Caching the bitmap shader itself (as opposed to just the tile bitmap)
makes for a chunkier key, but OTOH avoids allocating new shaders on
cache hit.

R=reed@google.com,mtklein@google.com

Review URL: https://codereview.chromium.org/671683004
Use correct size for font style name search.

This fixes an out of bounds read introduced with
a4c4a2d8cd65abb1e5ac20813831cdb9ace6c7ee
"Replace SkTypeface::Style with SkFontStyle."

BUG=chromium:425856

Review URL: https://codereview.chromium.org/645223006