Add GLSL support for texelFetch

include/gpu/GrCaps.h

Index: include/gpu/GrCaps.h
diff --git a/include/gpu/GrCaps.h b/include/gpu/GrCaps.h
index d698a4142c2b5f783d1753e8678f18b96615b7de..6d11b137e4ab1b299ede42e949e980bc2399c569 100644
--- a/include/gpu/GrCaps.h
+++ b/include/gpu/GrCaps.h
@@ -63,6 +63,7 @@ public:
     bool dstReadInShaderSupport() const { return fDstReadInShaderSupport; }
     bool dualSourceBlendingSupport() const { return fDualSourceBlendingSupport; }
     bool integerSupport() const { return fIntegerSupport; }
+    bool texelBufferSupport() const { return fTexelBufferSupport; }
 
     /**
     * Get the precision info for a variable of type kFloat_GrSLType, kVec2f_GrSLType, etc in a
@@ -111,6 +112,7 @@ protected:
     bool fDstReadInShaderSupport : 1;
     bool fDualSourceBlendingSupport : 1;
     bool fIntegerSupport : 1;
+    bool fTexelBufferSupport : 1;
 
     bool fShaderPrecisionVaries;
     PrecisionInfo fFloatPrecisions[kGrShaderTypeCount][kGrSLPrecisionCount];