Use high precision vertex attributes.

src/gpu/GrDefaultGeoProcFactory.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDefaultGeoProcFactory.h"
 
 #include "GrInvariantOutput.h"
@@ skipping 175 matching lines @@
         , fViewMatrix(viewMatrix)
         , fLocalMatrix(localMatrix)
         , fCoverage(coverage)
         , fFlags(gpTypeFlags)
         , fUsesLocalCoords(usesLocalCoords)
         , fCoverageIgnored(coverageIgnored) {
         this->initClassID<DefaultGeoProc>();
         bool hasColor = SkToBool(gpTypeFlags & GrDefaultGeoProcFactory::kColor_GPType);
         bool hasLocalCoord = SkToBool(gpTypeFlags & GrDefaultGeoProcFactory::kLocalCoord_GPType);
         bool hasCoverage = SkToBool(gpTypeFlags & GrDefaultGeoProcFactory::kCoverage_GPType);
-        fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType));
+        fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType,
+                                                       kHigh_GrSLPrecision));
         if (hasColor) {
             fInColor = &this->addVertexAttrib(Attribute("inColor", kVec4ub_GrVertexAttribType));
         }
         if (hasLocalCoord) {
             fInLocalCoords = &this->addVertexAttrib(Attribute("inLocalCoord",
                                                               kVec2f_GrVertexAttribType));
             this->setHasLocalCoords();
         }
         if (hasCoverage) {
             fInCoverage = &this->addVertexAttrib(Attribute("inCoverage",
@@ skipping 52 matching lines @@
                                                            const SkMatrix& localMatrix,
                                                            uint8_t coverage) {
     return DefaultGeoProc::Create(gpTypeFlags,
                                   color,
                                   viewMatrix,
                                   localMatrix,
                                   usesLocalCoords,
                                   coverageIgnored,
                                   coverage);
 }