Introduce gpu_fuzzer to fuzz the GPU command buffers

gpu/BUILD.gn

 # Copyright 2014 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.
 
 # GYP-to-GN project mappings:
 #
 #  gpu.gyp:command_buffer_client => //gpu/command_buffer/client
 #
 #  gpu.gyp:command_buffer_common => //gpu/command_buffer/common
 #
@@ skipping 13 matching lines @@
 #
 #  gpu.gyp:gpu_ipc => //gpu/ipc
 #
 #  gpu.gyp:disk_cache_proto => //gpu/command_buffer/service:disk_cache_proto
 #
 #  command_buffer/command_buffer.gyp:gles2_utils =>
 #     //gpu/command_buffer/common:gles2_utils
 #
 # gpu/skia_bindings/skia_bindings.gyp:gpu_skia_bindings => //gpu/skia_bindings
 
+import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
 import("//build/config/ui.gni")
 
 config("gpu_implementation") {
   defines = [ "GPU_IMPLEMENTATION" ]
 }
 
 component("gpu") {
   public_deps = [
     "//gpu/command_buffer/client:client_sources",
@@ skipping 354 matching lines @@
     "//testing/gtest",
     "//testing/perf",
     "//ui/gfx/geometry",
     "//ui/gl",
     "//ui/gl/init",
   ]
 
   # This target should not require the Chrome executable to run.
   assert_no_deps = [ "//chrome" ]
 }
+
+fuzzer_test("gpu_fuzzer") {
+  sources = [
+    "command_buffer/tests/fuzzer_main.cc",
+  ]
+
+  deps = [
+    ":gpu",
+    "//base",
+    "//base/third_party/dynamic_annotations",
+    "//gpu/command_buffer/common:gles2_utils",
+    "//ui/gfx/geometry",
+    "//ui/gl",
+    "//ui/gl:test_support",
+  ]
+
+  libfuzzer_options = [
+    "max_len=16384",
+    "use_traces=1",
+  ]
+}