Use texture size to determine precision of texture coord varyings

src/gpu/gl/builders/GrGLProgramBuilder.h

Index: src/gpu/gl/builders/GrGLProgramBuilder.h
diff --git a/src/gpu/gl/builders/GrGLProgramBuilder.h b/src/gpu/gl/builders/GrGLProgramBuilder.h
index 973ae5e07820a1e24cb228980983f4d0500d8c44..b7458b3e8fb8b850f728fc6530e5053d901cbcd3 100644
--- a/src/gpu/gl/builders/GrGLProgramBuilder.h
+++ b/src/gpu/gl/builders/GrGLProgramBuilder.h
@@ -30,9 +30,9 @@
 class GrGLUniformBuilder {
 public:
     enum ShaderVisibility {
-        kVertex_Visibility   = 0x1,
-        kGeometry_Visibility = 0x2,
-        kFragment_Visibility = 0x4,
+        kVertex_Visibility   = 1 << kVertex_GrShaderType,
+        kGeometry_Visibility = 1 << kGeometry_GrShaderType,
+        kFragment_Visibility = 1 << kFragment_GrShaderType,
     };
 
     virtual ~GrGLUniformBuilder() {}
@@ -344,12 +344,6 @@ protected:
         SkString fSourceCoords;
     };
 
-    void addCoordVarying(const char* name, GrGLVarying* v, const char* uniName,
-                         const char* sourceCoords) {
-        this->addVarying(name, v);
-        fCoordVaryings.push_back(TransformVarying(*v, uniName, sourceCoords));
-    }
-
     const char* rtAdjustment() const { return "rtAdjustment"; }
 
     // number of each input/output type in a single allocation block, used by many builders