Build pdf_cfgas_stringformatter_fuzzer

Change-Id: I518b842d63af413684e3af3e203335a9726357ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1535194
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#643425}

pdf/pdfium/fuzzers/BUILD.gn

@@ -38,6 +38,7 @@ group("pdf_fuzzers") {
     if (pdf_enable_xfa) {
       deps += [
         ":pdf_bidi_fuzzer",
+        ":pdf_cfgas_stringformatter_fuzzer",
         ":pdf_cfx_barcode_fuzzer",
         ":pdf_codec_jpeg_fuzzer",
         ":pdf_css_fuzzer",
@@ -290,6 +291,13 @@ if (pdf_enable_v8) {
       ]
     }
 
+    fuzzer_test("pdf_cfgas_stringformatter_fuzzer") {
+      sources = []
+      deps = [
+        "//third_party/pdfium/testing/fuzzers:pdf_cfgas_stringformatter_fuzzer_src",
+      ]
+    }
+
     fuzzer_test("pdfium_xfa_fuzzer") {
       sources = []
       deps = [