Roll src/third_party/skia 0faed58:5dd918b

Summary of changes available at:
https://chromium.googlesource.com/skia/+log/0faed58..5dd918b

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

Commits in this roll:
5dd918b fmalita@chromium.org Suppress test_imagegenerator_factory
2bcab82 reed@google.com remove code from SK_SUPPORT_LEGACY_NEWFROMGENERATOR, eliminates caller of deprecated SkInstallDiscardablePixelRef
48392b7 reed@google.com fix leaked generator
cd56f81 fmalita@chromium.org SkImageSource
506c802 bsalomon@google.com Add helper for creating leaf FPs inside GrFP::TestCreate functions
07344a5 mtklein@chromium.org Revert of SkPx: new approach to fixed-point SIMD (patchset #9 id:160001 of https://codereview.chromium.org/1317233005/ )
ec00d94 egdaniel@google.com Move some of the adding stencil attachment logic of Gpu and into Render Target.
37497dc rmistry@google.com Update SkWhitelistChecksums.cpp with the checksums of the fonts on the CT slave machines.
82c93b4 mtklein@chromium.org SkPx: new approach to fixed-point SIMD
b5b6032 bsalomon@google.com Test that GrFragmentProcessors work without input colors.
0faed58 mtklein@chromium.org cmake_build: support SKIA_OUT and BUILDTYPE
59ce45f bsalomon@google.com Revert of Test that GrFragmentProcessors work without input colors. (patchset #2 id:20001 of https://codereview.chromium.org/1341853002/ )
72c58e7 bsalomon@google.com Test that GrFragmentProcessors work without input colors.
3833daa robertphillips@google.com Fix GPU-only snapping bug in mask blur rendering
efd50da reed@google.com impl preroll for all image backends
5a744b7 mtklein@chromium.org Have SkVarAlloc::alloc() use sk_malloc_throw.
a46ada5 mtklein@chromium.org SkValidatingReadBuffer: make sure we don't call readTypeface().
8725e53 reed@google.com fix leak in test

Review URL: https://codereview.chromium.org/1346453006

Cr-Commit-Position: refs/heads/master@{#348775}

DEPS

@@ -35,7 +35,7 @@ vars = {
   'chromium_git': 'https://chromium.googlesource.com',
   'libvpx_revision': 'ac1772e3db5c885b554f6a72ca9dbac4245cb0e2',
   'sfntly_revision': '1bdaae8fc788a5ac8936d68bf24f37d977a13dac',
-  'skia_revision': '0faed58bc781adc8f21786943ffada1a0fc69b5a',
+  'skia_revision': '5dd918bb6f56dd0a4e400b5107fcfff1e4dcc3c1',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.