Add missing include to fix generated files bot

Change-Id: I93ff7e5f1062c6a85152c587fcedc34e9257dd27
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/319345
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/src/sksl/SkSLASTNode.h b/src/sksl/SkSLASTNode.h
index 795acbb..5922cd5 100644
--- a/src/sksl/SkSLASTNode.h
+++ b/src/sksl/SkSLASTNode.h
@@ -12,6 +12,7 @@
 #include "src/sksl/SkSLString.h"
 #include "src/sksl/ir/SkSLModifiers.h"
 
+#include <algorithm>
 #include <vector>
 
 namespace SkSL {