Make addUniform take a precision

src/gpu/effects/GrTextureDomain.cpp

Index: src/gpu/effects/GrTextureDomain.cpp
diff --git a/src/gpu/effects/GrTextureDomain.cpp b/src/gpu/effects/GrTextureDomain.cpp
index c6a9a22a946183632bec88249c9208625fe1d12e..b5b9ae46d93a555c883e79946a62edf285a85877 100644
--- a/src/gpu/effects/GrTextureDomain.cpp
+++ b/src/gpu/effects/GrTextureDomain.cpp
@@ -56,8 +56,9 @@ void GrTextureDomain::GLDomain::sampleTexture(GrGLShaderBuilder* builder,
         if (textureDomain.fIndex >= 0) {
             uniName.appendS32(textureDomain.fIndex);
         }
-        fDomainUni = program->addUniform(GrGLProgramBuilder::kFragment_Visibility, kVec4f_GrSLType,
-                uniName.c_str(), &name);
+        fDomainUni = program->addUniform(GrGLProgramBuilder::kFragment_Visibility,
+                                         kVec4f_GrSLType, kDefault_GrSLPrecision,
+                                         uniName.c_str(), &name);
         fDomainName = name;
     }