[libfuzzer] proto-based renderer fuzzer draft

content/test/fuzzer/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Fuzzers for content/ components.
 
 import("//testing/libfuzzer/fuzzer_test.gni")
+import("//third_party/protobuf/proto_library.gni")
 
 # Empty group for package discovery.
 group("fuzzer") {
 }
 
 # gn complains of private dependencies in component build.
 if (!is_component_build) {
   source_set("fuzzer_support") {
     sources = [
       "fuzzer_support.cc",
@@ skipping 42 matching lines @@
     sources = [
       "clear_site_data_fuzzer.cc",
     ]
     deps = [
       ":fuzzer_support",
       "//base",
       "//content/browser:for_content_tests",
     ]
     seed_corpus = "//content/test/data/fuzzer_corpus/clear_site_data/"
   }
+
+  fuzzer_test("renderer_proto_tree_fuzzer") {
+    sources = [
+      "renderer_proto_tree_fuzzer.cc",
+    ]
+    deps = [
+      ":fuzzer_support",
+      ":html_tree_proto",
+      "//third_party/libprotobuf-mutator",
+    ]
+  }
+
+  proto_library("html_tree_proto") {
+    sources = [
+      "html_tree.proto",
+    ]
+    testonly = true
+  }
 }