Use texture size to determine precision of texture coord varyings

include/gpu/GrTypesPriv.h

Index: include/gpu/GrTypesPriv.h
diff --git a/include/gpu/GrTypesPriv.h b/include/gpu/GrTypesPriv.h
index 0ff4e5709e4928a7fa69c418c114ad0665ee0c21..83d85612b91b94133700e83b6ffd6b80f1643259 100644
--- a/include/gpu/GrTypesPriv.h
+++ b/include/gpu/GrTypesPriv.h
@@ -29,6 +29,15 @@ enum GrSLType {
 };
 static const int kGrSLTypeCount = kLast_GrSLType + 1;
 
+enum GrShaderType {
+    kVertex_GrShaderType,
+    kGeometry_GrShaderType,
+    kFragment_GrShaderType,
+
+    kLastkFragment_GrShaderType = kFragment_GrShaderType
+};
+static const int kGrShaderTypeCount = kLastkFragment_GrShaderType + 1;
+
 /**
  * Gets the vector size of the SLType. Returns -1 for void, matrices, and samplers.
  */