Add unit tests target to GN build.

chrome/tools/profile_reset/BUILD.gn

+# Copyright 2015 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.
+
+executable("jtl_compiler") {
+  sources = [
+    "//chrome/browser/profile_resetter/jtl_foundation.cc",
+    "//chrome/browser/profile_resetter/jtl_foundation.h",
+    "jtl_compiler_frontend.cc",
+  ]
+  deps = [
+    ":jtl_compiler_lib",
+    "//base",
+    "//crypto",
+  ]
+}
+
+source_set("jtl_compiler_lib") {
+  sources = [
+    "//chrome/browser/profile_resetter/jtl_foundation.h",
+    "//chrome/browser/profile_resetter/jtl_instructions.h",
+    "jtl_compiler.h",
+    "jtl_compiler.cc",
+    "jtl_parser.h",
+    "jtl_parser.cc",
+  ]
+  deps = [
+    "//base",
+    "//third_party/re2",
+  ]
+}