Make addUniform take a precision

src/effects/SkAlphaThresholdFilter.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 "SkAlphaThresholdFilter.h"
 #include "SkBitmap.h"
 #include "SkReadBuffer.h"
@@ skipping 125 matching lines @@
 };
 
 void GrGLAlphaThresholdEffect::emitCode(GrGLFPBuilder* builder,
                                         const GrFragmentProcessor&,
                                         const char* outputColor,
                                         const char* inputColor,
                                         const TransformedCoordsArray& coords,
                                         const TextureSamplerArray& samplers) {
     fInnerThresholdVar = builder->addUniform(
         GrGLProgramBuilder::kFragment_Visibility,
-        kFloat_GrSLType, "inner_threshold");
+        kFloat_GrSLType, kDefault_GrSLPrecision,
+        "inner_threshold");
     fOuterThresholdVar = builder->addUniform(
         GrGLProgramBuilder::kFragment_Visibility,
-        kFloat_GrSLType, "outer_threshold");
+        kFloat_GrSLType, kDefault_GrSLPrecision,
+        "outer_threshold");
 
     GrGLFPFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
     SkString coords2D = fsBuilder->ensureFSCoords2D(coords, 0);
     SkString maskCoords2D = fsBuilder->ensureFSCoords2D(coords, 1);
 
     fsBuilder->codeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str());
     fsBuilder->codeAppendf("\t\tvec2 mask_coord = %s;\n", maskCoords2D.c_str());
     fsBuilder->codeAppend("\t\tvec4 input_color = ");
     fsBuilder->appendTextureLookup(samplers[0], "coord");
     fsBuilder->codeAppend(";\n");
@@ skipping 206 matching lines @@
                                                   (U8CPU)(SkColorGetG(source) * scale),
                                                   (U8CPU)(SkColorGetB(source) * scale));
                 }
             }
             dptr[y * dst->width() + x] = output_color;
         }
     }
 
     return true;
 }