Roll src/third_party/skia/ 134ff5c9c..20efb41db (5 commits).
Roll src/third_party/skia/ 134ff5c9c..20efb41db (5 commits).

https://chromium.googlesource.com/skia.git/+log/134ff5c9cf99..20efb41dbbbe

$ git log 134ff5c9c..20efb41db --date=short --no-merges --format='%ad %ae %s'
2016-04-12 mtklein distinguish distinct matrixconvolution benchmarks
2016-04-12 herb Blitter for repeat RGBA8888->RGBA8888.
2016-04-12 brianosman Add missing F16 case to reverse pixel config conversion
2016-04-12 bungeman Begin switch to SkFontStyle for legacy calls.
2016-04-12 brianosman sRGB support for distance field text.

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=borenet@google.com

Review URL: https://codereview.chromium.org/1880963004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#386884}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk