Implement GL support for buffer textures

src/gpu/glsl/GrGLSLShaderBuilder.cpp

Index: src/gpu/glsl/GrGLSLShaderBuilder.cpp
diff --git a/src/gpu/glsl/GrGLSLShaderBuilder.cpp b/src/gpu/glsl/GrGLSLShaderBuilder.cpp
index 30bf86d2106c98ac3960865d3f6373e601dd2e92..e4753e991b15d42c00f90ef0e7207948bbc21593 100644
--- a/src/gpu/glsl/GrGLSLShaderBuilder.cpp
+++ b/src/gpu/glsl/GrGLSLShaderBuilder.cpp
@@ -59,22 +59,20 @@ void GrGLSLShaderBuilder::emitFunction(GrSLType returnType,
 void GrGLSLShaderBuilder::appendTextureLookup(SkString* out,
                                               const GrGLSLTextureSampler& sampler,
                                               const char* coordName,
-                                              GrSLType varyingType) const {
+                                              GrSLType coordType) const {
     const GrGLSLCaps* glslCaps = fProgramBuilder->glslCaps();
     GrGLSLUniformHandler* uniformHandler = fProgramBuilder->uniformHandler();
     GrSLType samplerType = uniformHandler->getUniformVariable(sampler.fSamplerUniform).getType();
     if (samplerType == kSampler2DRect_GrSLType) {
-        if (varyingType == kVec2f_GrSLType) {
+        if (coordType == kVec2f_GrSLType) {
             out->appendf("%s(%s, textureSize(%s) * %s)",
-                         GrGLSLTexture2DFunctionName(varyingType, samplerType,
-                                                     glslCaps->generation()),
+                         GrGLSLTextureFunctionName(coordType, samplerType, glslCaps->generation()),
                          uniformHandler->getUniformCStr(sampler.fSamplerUniform),
                          uniformHandler->getUniformCStr(sampler.fSamplerUniform),
                          coordName);
         } else {
             out->appendf("%s(%s, vec3(textureSize(%s) * %s.xy, %s.z))",
-                         GrGLSLTexture2DFunctionName(varyingType, samplerType,
-                                                     glslCaps->generation()),
+                         GrGLSLTextureFunctionName(coordType, samplerType, glslCaps->generation()),
                          uniformHandler->getUniformCStr(sampler.fSamplerUniform),
                          uniformHandler->getUniformCStr(sampler.fSamplerUniform),
                          coordName,
@@ -82,7 +80,7 @@ void GrGLSLShaderBuilder::appendTextureLookup(SkString* out,
         }
     } else {
         out->appendf("%s(%s, %s)",
-                     GrGLSLTexture2DFunctionName(varyingType, samplerType, glslCaps->generation()),
+                     GrGLSLTextureFunctionName(coordType, samplerType, glslCaps->generation()),
                      uniformHandler->getUniformCStr(sampler.fSamplerUniform),
                      coordName);
     }