SkSL workaround for appendf 1024 byte restriction

Bug: skia:
Change-Id: Ibb04e032e27e834b5e3e40c40522e756223f58ec
Reviewed-on: https://skia-review.googlesource.com/59680
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/sksl/SkSLCPPCodeGenerator.h b/src/sksl/SkSLCPPCodeGenerator.h
index 6727b9c..ea4d030 100644
--- a/src/sksl/SkSLCPPCodeGenerator.h
+++ b/src/sksl/SkSLCPPCodeGenerator.h
@@ -68,6 +68,8 @@
 
     void writePrivateVarValues();
 
+    void writeCodeAppend(const String& code);
+
     bool writeEmitCode(std::vector<const Variable*>& uniforms);
 
     void writeSetData(std::vector<const Variable*>& uniforms);