Abandon offset support with texel buffers

src/gpu/gl/GrGLGpu.h

Index: src/gpu/gl/GrGLGpu.h
diff --git a/src/gpu/gl/GrGLGpu.h b/src/gpu/gl/GrGLGpu.h
index 0b2198a8342ae69d66fb865140e1df56e94c383f..121fab76363d26fab984f61699d036f300f3146e 100644
--- a/src/gpu/gl/GrGLGpu.h
+++ b/src/gpu/gl/GrGLGpu.h
@@ -60,7 +60,7 @@ public:
     void bindTexture(int unitIdx, const GrTextureParams& params, bool allowSRGBInputs,
                      GrGLTexture* texture);
 
-    void bindTexelBuffer(int unitIdx, intptr_t offsetInBytes, GrPixelConfig, GrGLBuffer*);
+    void bindTexelBuffer(int unitIdx, GrPixelConfig, GrGLBuffer*);
 
     bool onGetReadPixelsInfo(GrSurface* srcSurface, int readWidth, int readHeight, size_t rowBytes,
                              GrPixelConfig readConfig, DrawPreference*,
@@ -508,9 +508,7 @@ private:
 
         GrGLuint        fTextureID;
         bool            fKnownBound;
-        intptr_t        fOffsetInBytes;
         GrPixelConfig   fTexelConfig;
-        size_t          fAttachedSizeInBytes;
         uint32_t        fAttachedBufferUniqueID;
         GrSwizzle       fSwizzle;
     };