content: add header files of public that were not listed in the BUILD.gn file

content/test/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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
@@ skipping 476 matching lines @@
     "layouttest_support.cc",
   ]
 
   deps = [
     ":test_support",
     "//cc",
     "//cc/blink",
     "//content/browser:for_content_tests",
     "//content/child:for_content_tests",
     "//content/public/common",
+    "//content/public/renderer",
     "//content/renderer:for_content_tests",
     "//content/shell/test_runner:test_runner",
     "//device/bluetooth",
     "//device/gamepad/public/cpp:shared_with_blink",
     "//device/sensors/public/cpp:full",
     "//services/ui/public/cpp/gpu",
     "//skia",
     "//ui/accessibility:ax_gen",
     "//ui/events/blink",
     "//ui/gfx:test_support",
@@ skipping 1322 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }