Change pdf/pdfium/fuzzers/BUILD.gn to use dicts and seed corpora

pdf/pdfium/fuzzers/dicts/pdf_codec_tiff.dict

Index: pdf/pdfium/fuzzers/dicts/pdf_codec_tiff.dict
diff --git a/pdf/pdfium/fuzzers/dicts/pdf_codec_tiff.dict b/pdf/pdfium/fuzzers/dicts/pdf_codec_tiff.dict
new file mode 100644
index 0000000000000000000000000000000000000000..8f04b5af1ba20b9c79f6c337b478f0ba97300373
--- /dev/null
+++ b/pdf/pdfium/fuzzers/dicts/pdf_codec_tiff.dict
@@ -0,0 +1,51 @@
+#
+# AFL dictionary for TIFF images
+# ------------------------------
+#
+# Just the basic, standard-originating sections; does not include vendor
+# extensions.
+#
+# Created by Michal Zalewski <lcamtuf@google.com>
+#
+
+header_ii="II*\x00"
+header_mm="MM\x00*"
+
+section_100="\x00\x01"
+section_101="\x01\x01"
+section_102="\x02\x01"
+section_103="\x03\x01"
+section_106="\x06\x01"
+section_107="\x07\x01"
+section_10D="\x0d\x01"
+section_10E="\x0e\x01"
+section_10F="\x0f\x01"
+section_110="\x10\x01"
+section_111="\x11\x01"
+section_112="\x12\x01"
+section_115="\x15\x01"
+section_116="\x16\x01"
+section_117="\x17\x01"
+section_11A="\x1a\x01"
+section_11B="\x1b\x01"
+section_11C="\x1c\x01"
+section_11D="\x1d\x01"
+section_11E="\x1e\x01"
+section_11F="\x1f\x01"
+section_122="\"\x01"
+section_123="#\x01"
+section_124="$\x01"
+section_125="%\x01"
+section_128="(\x01"
+section_129=")\x01"
+section_12D="-\x01"
+section_131="1\x01"
+section_132="2\x01"
+section_13B=";\x01"
+section_13C="<\x01"
+section_13D="=\x01"
+section_13E=">\x01"
+section_13F="?\x01"
+section_140="@\x01"
+section_FE="\xfe\x00"
+section_FF="\xff\x00"