Implement a fuzzer for skia paths.

skia/BUILD.gn

Index: skia/BUILD.gn
diff --git a/skia/BUILD.gn b/skia/BUILD.gn
index 9f0b5827c824fdbfec7f1d3d8d8e9bb1b46afea7..752a59f41fa1b85b47a69f8013f9ade8dd13d9f1 100644
--- a/skia/BUILD.gn
+++ b/skia/BUILD.gn
@@ -4,6 +4,7 @@
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
+import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
 if (current_cpu == "arm") {
   import("//build/config/arm.gni")
@@ -22,6 +23,7 @@ skia_support_pdf = !is_ios && (enable_basic_printing || enable_print_preview)
 
 declare_args() {
   skia_whitelist_serialized_typefaces = false
+
   # TODO(crbug.com/607933): Once GYP is no longer supported, port iOS to use
   # optimised skia.
   skia_build_no_opts = is_ios
@@ -758,4 +760,14 @@ if (!is_ios) {
       "//build/config/sanitizers:deps",
     ]
   }
+
+  fuzzer_test("path_fuzzer") {
+    sources = [
+      "tools/path_fuzzer/path_fuzzer.cc",
+    ]
+
+    deps = [
+      ":skia",
+    ]
+  }
 }