Add arb_texture_rectangle support properly in GLES3 shaders

src/gpu/gl/builders/GrGLProgramBuilder.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLProgramBuilder.h"
 
 #include "GrAutoLocaleSetter.h"
@@ skipping 79 matching lines @@
         GrSLType samplerType = get_sampler_type(processor.textureAccess(t));
         localSamplerUniforms[t] = fUniformHandler.addUniform(kFragment_GrShaderFlag, samplerType,
                                                              kDefault_GrSLPrecision, name.c_str());
         outSamplers->emplace_back(localSamplerUniforms[t], processor.textureAccess(t));
         if (kSamplerExternal_GrSLType == samplerType) {
             const char* externalFeatureString = this->glslCaps()->externalTextureExtensionString();
             // We shouldn't ever create a GrGLTexture that requires external sampler type 
             SkASSERT(externalFeatureString);
             fFS.addFeature(1 << GrGLSLFragmentShaderBuilder::kExternalTexture_GLSLPrivateFeature,
                            externalFeatureString);
+        } else if (kSampler2DRect_GrSLType == samplerType) {
+            const char* rectangleFeatureString =
+                    this->glslCaps()->rectangleTextureExtensionString();
+            fFS.addFeature(1 << GrGLSLFragmentShaderBuilder::kRectangleTexture_GLSLPrivateFeature,
+                           rectangleFeatureString);
         }
     }
 }
 
 bool GrGLProgramBuilder::compileAndAttachShaders(GrGLSLShaderBuilder& shader,
                                                  GrGLuint programId,
                                                  GrGLenum type,
                                                  SkTDArray<GrGLuint>* shaderIds) {
     GrGLGpu* gpu = this->gpu();
     GrGLuint shaderId = GrGLCompileAndAttachShader(gpu->glContext(),
@@ skipping 152 matching lines @@
                            fUniformHandles,
                            programID,
                            fUniformHandler.fUniforms,
                            fVaryingHandler.fPathProcVaryingInfos,
                            fGeometryProcessor,
                            fXferProcessor,
                            fFragmentProcessors,
                            &fSamplerUniforms);
 }