Add fuzzer for FDE CSS syntax parser.

testing/libfuzzer/fuzzers.gyp

 # Copyright 2016 PDFium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'pdf_enable_v8%': 1,
     'pdf_enable_xfa%': 0,  # Set to 1 in standalone builds by standalone.gypi.
   },
   'target_defaults': {
@@ skipping 101 matching lines @@
           'type': 'executable',
           'dependencies': [
             '../../pdfium.gyp:pdfium',
           ],
           'sources': [
             'pdf_codec_tiff_fuzzer.cc',
             'unittest_main.cc',
             '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"', {
       'targets': [
         {
           'target_name': 'pdf_jpx_fuzzer',
           'type': 'executable',
           'dependencies': [
             '../../pdfium.gyp:pdfium',
           ],
           'sources': [
             'pdf_jpx_fuzzer.cc',
             'unittest_main.cc',
           ],
         },
       ],
     }],
   ],
   # Empty target so that nonxfa builds work.
   'targets': [
     {
       'target_name': 'empty_target',
       'type': 'none',
     }
   ],
 }