Add arb_texture_rectangle support properly in GLES3 shaders

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 c94a85534f7fb7b3ec767ecced979b2a50c7af30..71011c63d0fac3dcdeb97740e6862bb17cdd31ad 100644
--- a/src/gpu/glsl/GrGLSLShaderBuilder.cpp
+++ b/src/gpu/glsl/GrGLSLShaderBuilder.cpp
@@ -67,14 +67,14 @@ void GrGLSLShaderBuilder::appendTextureLookup(SkString* out,
         if (varyingType == kVec2f_GrSLType) {
             out->appendf("%s(%s, textureSize(%s) * %s)",
                          GrGLSLTexture2DFunctionName(varyingType, samplerType,
-                                                     glslCaps->generation()),
+                                                     *glslCaps),
                          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()),
+                                                     *glslCaps),
                          uniformHandler->getUniformCStr(sampler.fSamplerUniform),
                          uniformHandler->getUniformCStr(sampler.fSamplerUniform),
                          coordName,
@@ -82,7 +82,7 @@ void GrGLSLShaderBuilder::appendTextureLookup(SkString* out,
         }
     } else {
         out->appendf("%s(%s, %s)",
-                     GrGLSLTexture2DFunctionName(varyingType, samplerType, glslCaps->generation()),
+                     GrGLSLTexture2DFunctionName(varyingType, samplerType, *glslCaps),
                      uniformHandler->getUniformCStr(sampler.fSamplerUniform),
                      coordName);
     }