Link pdf_nametree_fuzzer.

Build a binary for the PDFium fuzzer added in
https://pdfium-review.googlesource.com/61470 .

Change-Id: Ibec0fb7289691e446d62af5557385aef1253d30c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873397Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708686}

pdf/pdfium/fuzzers/BUILD.gn

@@ -66,6 +66,9 @@ group("pdf_fuzzers") {
       }
     }
   }
+  if (is_clang) {
+    deps += [ ":pdf_nametree_fuzzer" ]
+  }
 }
 
 fuzzer_test("pdfium_fuzzer") {
@@ -358,6 +361,15 @@ if (pdf_enable_v8) {
   }
 }
 
+if (is_clang) {
+  fuzzer_test("pdf_nametree_fuzzer") {
+    sources = []
+    deps = [
+      "//third_party/pdfium/testing/fuzzers:pdf_nametree_fuzzer_src",
+    ]
+  }
+}
+
 proto_library("xfa_proto") {
   sources = [
     "pdfium_xfa_lpm_fuzzer/xfa.proto",