Add sampler precision to GrTextureAccess

include/gpu/GrTypesPriv.h

Index: include/gpu/GrTypesPriv.h
diff --git a/include/gpu/GrTypesPriv.h b/include/gpu/GrTypesPriv.h
index a0451537720e66c797762e36b434c8fc6a05a8ee..a2facfa6cfc0f2c65d95fda4c96646323e68a202 100644
--- a/include/gpu/GrTypesPriv.h
+++ b/include/gpu/GrTypesPriv.h
@@ -204,6 +204,10 @@ static inline bool GrSLTypeIsSamplerType(GrSLType type) {
     GR_STATIC_ASSERT(10 == kSampler2DRect_GrSLType);
 }
 
+static inline bool GrSLTypeAcceptsPrecision(GrSLType type) {
+    return GrSLTypeIsNumeric(type) || GrSLTypeIsSamplerType(type);
+}
+
 //////////////////////////////////////////////////////////////////////////////
 
 /**