IWYU for fuzz binary

Bug: skia:
Change-Id: I6d04fad4d5089c97761d6082b6c39f047e90fd52
Reviewed-on: https://skia-review.googlesource.com/123223
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Stan Iliev <stani@google.com>
Auto-Submit: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Stan Iliev <stani@google.com>
diff --git a/fuzz/fuzz.cpp b/fuzz/fuzz.cpp
index 29a70e2..baaefd3 100644
--- a/fuzz/fuzz.cpp
+++ b/fuzz/fuzz.cpp
@@ -29,6 +29,7 @@
 #endif
 
 #include <iostream>
+#include <map>
 #include <regex>
 #include <signal.h>
 #include "sk_tool_utils.h"