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

Add dictionaries and seed corpora from AFL.
All of the additions were shown to significantly help afl-fuzz fuzz the target fuzzers.

BUG=611337

Review-Url: https://codereview.chromium.org/2168263005
Cr-Commit-Position: refs/heads/master@{#407292}

pdf/pdfium/fuzzers/BUILD.gn

@@ -33,6 +33,7 @@ fuzzer_test("pdf_jpx_fuzzer") {
   deps = [
     "//third_party/pdfium/testing/libfuzzer:pdf_jpx_fuzzer",
   ]
+  seed_corpus = "corpora/pdf_jpx"
 }
 
 if (pdf_enable_xfa) {
@@ -41,6 +42,7 @@ if (pdf_enable_xfa) {
     deps = [
       "//third_party/pdfium/testing/libfuzzer:pdf_codec_bmp_fuzzer",
     ]
+    seed_corpus = "corpora/pdf_codec_bmp"
   }
 
   fuzzer_test("pdf_codec_gif_fuzzer") {
@@ -48,6 +50,8 @@ if (pdf_enable_xfa) {
     deps = [
       "//third_party/pdfium/testing/libfuzzer:pdf_codec_gif_fuzzer",
     ]
+    dict = "dicts/pdf_codec_gif.dict"
+    seed_corpus = "corpora/pdf_codec_gif"
   }
 
   fuzzer_test("pdf_codec_jpeg_fuzzer") {
@@ -55,6 +59,8 @@ if (pdf_enable_xfa) {
     deps = [
       "//third_party/pdfium/testing/libfuzzer:pdf_codec_jpeg_fuzzer",
     ]
+    dict = "dicts/pdf_codec_jpeg.dict"
+    seed_corpus = "corpora/pdf_codec_jpeg"
   }
 
   fuzzer_test("pdf_codec_png_fuzzer") {
@@ -62,6 +68,8 @@ if (pdf_enable_xfa) {
     deps = [
       "//third_party/pdfium/testing/libfuzzer:pdf_codec_png_fuzzer",
     ]
+    dict = "dicts/pdf_codec_png.dict"
+    seed_corpus = "corpora/pdf_codec_png"
   }
 
   fuzzer_test("pdf_codec_tiff_fuzzer") {
@@ -69,6 +77,8 @@ if (pdf_enable_xfa) {
     deps = [
       "//third_party/pdfium/testing/libfuzzer:pdf_codec_tiff_fuzzer",
     ]
+    dict = "dicts/pdf_codec_tiff.dict"
+    seed_corpus = "corpora/pdf_codec_tiff"
   }
 
   fuzzer_test("pdf_css_fuzzer") {

pdf/pdfium/fuzzers/dicts/pdf_codec_gif.dict

+#
+# AFL dictionary for GIF images
+# -----------------------------
+#
+# Created by Michal Zalewski <lcamtuf@google.com>
+#
+
+header_87a="87a"
+header_89a="89a"
+header_gif="GIF"
+
+marker_2c=","
+marker_3b=";"
+
+section_2101="!\x01\x12"
+section_21f9="!\xf9\x04"
+section_21fe="!\xfe"
+section_21ff="!\xff\x11"

pdf/pdfium/fuzzers/dicts/pdf_codec_jpeg.dict

+#
+# AFL dictionary for JPEG images
+# ------------------------------
+#
+# Created by Michal Zalewski <lcamtuf@google.com>
+#
+
+header_jfif="JFIF\x00"
+header_jfxx="JFXX\x00"
+
+section_ffc0="\xff\xc0"
+section_ffc2="\xff\xc2"
+section_ffc4="\xff\xc4"
+section_ffd0="\xff\xd0"
+section_ffd8="\xff\xd8"
+section_ffd9="\xff\xd9"
+section_ffda="\xff\xda"
+section_ffdb="\xff\xdb"
+section_ffdd="\xff\xdd"
+section_ffe0="\xff\xe0"
+section_ffe1="\xff\xe1"
+section_fffe="\xff\xfe"

pdf/pdfium/fuzzers/dicts/pdf_codec_png.dict

+#
+# AFL dictionary for PNG images
+# -----------------------------
+#
+# Just the basic, standard-originating sections; does not include vendor
+# extensions.
+#
+# Created by Michal Zalewski <lcamtuf@google.com>
+#
+
+header_png="\x89PNG\x0d\x0a\x1a\x0a"
+
+section_IDAT="IDAT"
+section_IEND="IEND"
+section_IHDR="IHDR"
+section_PLTE="PLTE"
+section_bKGD="bKGD"
+section_cHRM="cHRM"
+section_fRAc="fRAc"
+section_gAMA="gAMA"
+section_gIFg="gIFg"
+section_gIFt="gIFt"
+section_gIFx="gIFx"
+section_hIST="hIST"
+section_iCCP="iCCP"
+section_iTXt="iTXt"
+section_oFFs="oFFs"
+section_pCAL="pCAL"
+section_pHYs="pHYs"
+section_sBIT="sBIT"
+section_sCAL="sCAL"
+section_sPLT="sPLT"
+section_sRGB="sRGB"
+section_sTER="sTER"
+section_tEXt="tEXt"
+section_tIME="tIME"
+section_tRNS="tRNS"
+section_zTXt="zTXt"

pdf/pdfium/fuzzers/dicts/pdf_codec_tiff.dict

+#
+# 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"