Add fuzzer for FDE CSS syntax parser.

testing/libfuzzer/fuzzers.gyp

Index: testing/libfuzzer/fuzzers.gyp
diff --git a/testing/libfuzzer/fuzzers.gyp b/testing/libfuzzer/fuzzers.gyp
index 3f1d8123b6c1628763a2d01941e92748040bc9f3..5f2a4d1bd94f6a34596577a62c78e4b62e0de791 100644
--- a/testing/libfuzzer/fuzzers.gyp
+++ b/testing/libfuzzer/fuzzers.gyp
@@ -15,6 +15,8 @@
     'include_dirs': [
       # This is implicit in GN.
       '<(DEPTH)',
+      '../../third_party/freetype/include',
+      '../../third_party/freetype/include/freetype',
     ],
     'conditions': [
       ['pdf_enable_v8==1', {
@@ -119,6 +121,17 @@
             'xfa_codec_fuzzer.h',
           ],
         },
+        {
+          'target_name': 'pdf_css_fuzzer',
+          'type': 'executable',
+          'dependencies': [
+            '../../pdfium.gyp:pdfium',
+          ],
+          'sources': [
+            'pdf_css_fuzzer.cc',
+            'unittest_main.cc',
+          ],
+        },
       ],
     }],
     ['OS=="linux"', {