GN: build dump_record

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3021

Change-Id: I447ef9a880e5b13103bac76d41e176c7940c8512
Reviewed-on: https://skia-review.googlesource.com/3021
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
diff --git a/BUILD.gn b/BUILD.gn
index a215494..41536e8 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1003,4 +1003,16 @@
     ]
     testonly = true
   }
+
+  executable("dump_record") {
+    sources = [
+      "tools/DumpRecord.cpp",
+      "tools/dump_record.cpp",
+    ]
+    deps = [
+      ":flags",
+      ":skia",
+    ]
+    testonly = true
+  }
 }