Roll external/skia 09a57b935..6e87eee2a (5 commits)

https://skia.googlesource.com/skia.git/+log/09a57b935..6e87eee2a

2018-01-18 reed@google.com add shadermaskfilter
2018-01-18 reed@google.com validate paint setters in readbuffer
2018-01-18 csmartdalton@google.com Extract a GrCCPathParser class that is decoupled from atlas ops
2018-01-18 ethannicholas@google.com SkSL now supports ternary lvalues
2018-01-18 reed@google.com detect fixed overflow in drawPoints

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Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

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Change-Id: I765da52d4180f50a84287e6d34131c6789b6d99d
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diff --git a/Android.bp b/Android.bp
index 07aed58..d4d29a5 100644
--- a/Android.bp
+++ b/Android.bp
@@ -397,6 +397,7 @@
         "src/effects/SkPaintImageFilter.cpp",
         "src/effects/SkPictureImageFilter.cpp",
         "src/effects/SkRRectsGaussianEdgeMaskFilter.cpp",
+        "src/effects/SkShaderMaskFilter.cpp",
         "src/effects/SkTableColorFilter.cpp",
         "src/effects/SkTableMaskFilter.cpp",
         "src/effects/SkTileImageFilter.cpp",
@@ -489,12 +490,12 @@
         "src/gpu/SkGr.cpp",
         "src/gpu/ccpr/GrCCAtlas.cpp",
         "src/gpu/ccpr/GrCCClipProcessor.cpp",
-        "src/gpu/ccpr/GrCCCoverageOp.cpp",
         "src/gpu/ccpr/GrCCCoverageProcessor.cpp",
         "src/gpu/ccpr/GrCCCoverageProcessor_GSImpl.cpp",
         "src/gpu/ccpr/GrCCCoverageProcessor_VSImpl.cpp",
         "src/gpu/ccpr/GrCCCubicShader.cpp",
         "src/gpu/ccpr/GrCCGeometry.cpp",
+        "src/gpu/ccpr/GrCCPathParser.cpp",
         "src/gpu/ccpr/GrCCPathProcessor.cpp",
         "src/gpu/ccpr/GrCCQuadraticShader.cpp",
         "src/gpu/ccpr/GrCCTriangleShader.cpp",
@@ -1349,6 +1350,7 @@
         "gm/samplerstress.cpp",
         "gm/savelayer.cpp",
         "gm/scaledstrokes.cpp",
+        "gm/shadermaskfilter.cpp",
         "gm/shadertext.cpp",
         "gm/shadertext2.cpp",
         "gm/shadertext3.cpp",
@@ -2268,6 +2270,7 @@
         "gm/samplerstress.cpp",
         "gm/savelayer.cpp",
         "gm/scaledstrokes.cpp",
+        "gm/shadermaskfilter.cpp",
         "gm/shadertext.cpp",
         "gm/shadertext2.cpp",
         "gm/shadertext3.cpp",