Make addUniform take a precision

src/effects/SkArithmeticMode.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 "SkArithmeticMode.h"
 #include "SkColorPriv.h"
 #include "SkReadBuffer.h"
@@ skipping 353 matching lines @@
         fsBuilder->codeAppend("\t\tvec4 bgColor = ");
         fsBuilder->appendTextureLookup(samplers[0], coords[0].c_str(), coords[0].getType());
         fsBuilder->codeAppendf(";\n");
         dstColor = "bgColor";
     } else {
         dstColor = fsBuilder->dstColor();
     }
 
     SkASSERT(dstColor);
     fKUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
-                                kVec4f_GrSLType, "k");
+                                kVec4f_GrSLType, kDefault_GrSLPrecision,
+                                "k");
     const char* kUni = builder->getUniformCStr(fKUni);
 
     // We don't try to optimize for this case at all
     if (NULL == inputColor) {
         fsBuilder->codeAppendf("\t\tconst vec4 src = vec4(1);\n");
     } else {
         fsBuilder->codeAppendf("\t\tvec4 src = %s;\n", inputColor);
         if (gUseUnpremul) {
             fsBuilder->codeAppendf("\t\tsrc.rgb = clamp(src.rgb / src.a, 0.0, 1.0);\n");
         }
@@ skipping 56 matching lines @@
                                          background);
     }
     return true;
 }
 
 #endif
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkArithmeticMode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkArithmeticMode_scalar)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END