Implement texel buffers

src/gpu/glsl/GrGLSLProgramBuilder.h

Index: src/gpu/glsl/GrGLSLProgramBuilder.h
diff --git a/src/gpu/glsl/GrGLSLProgramBuilder.h b/src/gpu/glsl/GrGLSLProgramBuilder.h
index 4d253c73bf6b443fda1a1bd7c2e16e976cb368b2..3ce7daf349afa9ad6c66ee086505ec0302e2ddca 100644
--- a/src/gpu/glsl/GrGLSLProgramBuilder.h
+++ b/src/gpu/glsl/GrGLSLProgramBuilder.h
@@ -146,7 +146,14 @@ private:
                                 const GrGLSLExpr4& coverageIn,
                                 bool ignoresCoverage,
                                 GrPixelLocalStorageState plsState);
-    void emitSamplers(const GrProcessor& processor, GrGLSLSampler::SamplerArray* outTexSamplers);
+    void emitSamplers(const GrProcessor& processor,
+                      GrGLSLSampler::SamplerArray* outTexSamplers,
+                      GrGLSLSampler::SamplerArray* outBufferSamplers);
+    void emitSampler(GrSLType samplerType,
+                     GrPixelConfig,
+                     const char* name,
+                     GrShaderFlags visibility,
+                     GrGLSLSampler::SamplerArray* outSamplers);
     void emitFSOutputSwizzle(bool hasSecondaryOutput);
     bool checkSamplerCounts();