Roll src/third_party/skia/ 46646506f..457f54df1 (3 commits).
Roll src/third_party/skia/ 46646506f..457f54df1 (3 commits).

https://chromium.googlesource.com/skia.git/+log/46646506f1c9..457f54df1e67

$ git log 46646506f..457f54df1 --date=short --no-merges --format='%ad %ae %s'
2015-12-11 msarett Change computeOutputColorType() to mimic old behavior
2015-12-11 scroggo Add test for previously unflattenables
2015-12-11 scroggo Fix a crash in SkParsePath::FromSVGString

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

Review URL: https://codereview.chromium.org/1521603003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#364795}

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