Make addUniform take a precision

src/effects/SkDisplacementMapEffect.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 "SkDisplacementMapEffect.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
@@ skipping 515 matching lines @@
 
 void GrGLDisplacementMapEffect::emitCode(GrGLFPBuilder* builder,
                                          const GrFragmentProcessor&,
                                          const char* outputColor,
                                          const char* inputColor,
                                          const TransformedCoordsArray& coords,
                                          const TextureSamplerArray& samplers) {
     sk_ignore_unused_variable(inputColor);
 
     fScaleUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
-                                    kVec2f_GrSLType, "Scale");
+                                    kVec2f_GrSLType, kDefault_GrSLPrecision, "Scale");
     const char* scaleUni = builder->getUniformCStr(fScaleUni);
     const char* dColor = "dColor";
     const char* cCoords = "cCoords";
     const char* outOfBounds = "outOfBounds";
     const char* nearZero = "1e-6"; // Since 6.10352e−5 is the smallest half float, use
                                    // a number smaller than that to approximate 0, but
                                    // leave room for 32-bit float GPU rounding errors.
 
     GrGLFPFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
     fsBuilder->codeAppendf("\t\tvec4 %s = ", dColor);
@@ skipping 68 matching lines @@
 void GrGLDisplacementMapEffect::GenKey(const GrProcessor& proc,
                                        const GrGLCaps&, GrProcessorKeyBuilder* b) {
     const GrDisplacementMapEffect& displacementMap = proc.cast<GrDisplacementMapEffect>();
 
     uint32_t xKey = displacementMap.xChannelSelector();
     uint32_t yKey = displacementMap.yChannelSelector() << kChannelSelectorKeyBits;
 
     b->add32(xKey | yKey);
 }
 #endif