bug fix for cubic low precision

src/gpu/effects/GrBezierEffect.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBezierEffect.h"
 
 #include "gl/builders/GrGLProgramBuilder.h"
@@ skipping 303 matching lines @@
     : INHERITED (factory) {
     const GrCubicEffect& ce = processor.cast<GrCubicEffect>();
     fEdgeType = ce.getEdgeType();
 }
 
 void GrGLCubicEffect::emitCode(const EmitArgs& args) {
     GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
     const GrCubicEffect& gp = args.fGP.cast<GrCubicEffect>();
 
     GrGLVertToFrag v(kVec4f_GrSLType);
-    args.fPB->addVarying("CubicCoeffs", &v);
+    args.fPB->addVarying("CubicCoeffs", &v, GrGLShaderVar::kHigh_Precision);
     vsBuilder->codeAppendf("%s = %s;", v.vsOut(), gp.inCubicCoeffs()->fName);
 
     // setup coord outputs
     vsBuilder->codeAppendf("%s = %s;", vsBuilder->positionCoords(), gp.inPosition()->fName);
     vsBuilder->codeAppendf("%s = %s;", vsBuilder->localCoords(), gp.inPosition()->fName);
 
     // setup position varying
     vsBuilder->codeAppendf("%s = %s * vec3(%s, 1);", vsBuilder->glPosition(), vsBuilder->uViewM(),
                            gp.inPosition()->fName);
 
@@ skipping 121 matching lines @@
                                                GrTexture*[]) {
     GrGeometryProcessor* gp;
     do {
         GrPrimitiveEdgeType edgeType = static_cast<GrPrimitiveEdgeType>(
                                                     random->nextULessThan(kGrProcessorEdgeTypeCnt));
         gp = GrCubicEffect::Create(edgeType, caps);
     } while (NULL == gp);
     return gp;
 }