Actually build fuzzers with the pdfium_all target.

Change-Id: Icc6b62f92d1a82ec60d1dd463d93376088017827
Reviewed-on: https://pdfium-review.googlesource.com/4792
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

testing/libfuzzer/BUILD.gn

diff --git a/testing/libfuzzer/BUILD.gn b/testing/libfuzzer/BUILD.gn
index e15ac05..b64cc38 100644
--- a/testing/libfuzzer/BUILD.gn
+++ b/testing/libfuzzer/BUILD.gn
@@ -21,6 +21,33 @@
 }
 
 group("libfuzzer") {
+  testonly = true
+  deps = [
+    ":pdf_cmap_fuzzer",
+    ":pdf_codec_a85_fuzzer",
+    ":pdf_codec_fax_fuzzer",
+    ":pdf_codec_icc_fuzzer",
+    ":pdf_codec_jbig2_fuzzer",
+    ":pdf_codec_rle_fuzzer",
+    ":pdf_hint_table_fuzzer",
+    ":pdf_jpx_fuzzer",
+    ":pdf_psengine_fuzzer",
+    ":pdf_streamparser_fuzzer",
+  ]
+  if (pdf_enable_xfa) {
+    deps += [
+      ":pdf_cfx_barcode_fuzzer",
+      ":pdf_cfx_saxreader_fuzzer",
+      ":pdf_codec_bmp_fuzzer",
+      ":pdf_codec_gif_fuzzer",
+      ":pdf_codec_jpeg_fuzzer",
+      ":pdf_codec_png_fuzzer",
+      ":pdf_codec_tiff_fuzzer",
+      ":pdf_css_fuzzer",
+      ":pdf_fm2js_fuzzer",
+      ":pdf_xml_fuzzer",
+    ]
+  }
 }
 
 template("pdfium_fuzzer") {