Use high precision vertex attributes.

src/gpu/effects/GrBezierEffect.cpp

Index: src/gpu/effects/GrBezierEffect.cpp
diff --git a/src/gpu/effects/GrBezierEffect.cpp b/src/gpu/effects/GrBezierEffect.cpp
index 582558027addb4cbac3916f20989d80573f720c8..840645e5c0940b626e0f7596c10dd5c8dbe4ff6f 100644
--- a/src/gpu/effects/GrBezierEffect.cpp
+++ b/src/gpu/effects/GrBezierEffect.cpp
@@ -200,7 +200,8 @@ GrConicEffect::GrConicEffect(GrColor color, const SkMatrix& viewMatrix, uint8_t
     , fCoverageScale(coverage)
     , fEdgeType(edgeType) {
     this->initClassID<GrConicEffect>();
-    fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType));
+    fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType,
+                                                   kHigh_GrSLPrecision));
     fInConicCoeffs = &this->addVertexAttrib(Attribute("inConicCoeffs",
                                                       kVec4f_GrVertexAttribType));
 }
@@ -401,7 +402,8 @@ GrQuadEffect::GrQuadEffect(GrColor color, const SkMatrix& viewMatrix, uint8_t co
     , fCoverageScale(coverage)
     , fEdgeType(edgeType) {
     this->initClassID<GrQuadEffect>();
-    fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType));
+    fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType,
+                                                   kHigh_GrSLPrecision));
     fInHairQuadEdge = &this->addVertexAttrib(Attribute("inHairQuadEdge",
                                                         kVec4f_GrVertexAttribType));
 }
@@ -614,7 +616,8 @@ GrCubicEffect::GrCubicEffect(GrColor color, const SkMatrix& viewMatrix,
     , fViewMatrix(viewMatrix)
     , fEdgeType(edgeType) {
     this->initClassID<GrCubicEffect>();
-    fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType));
+    fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType,
+                                                   kHigh_GrSLPrecision));
     fInCubicCoeffs = &this->addVertexAttrib(Attribute("inCubicCoeffs",
                                                         kVec4f_GrVertexAttribType));
 }