mac: ensure ui::Compositor exists for visible RWHVs

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/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build_overrides/v8.gni")
@@ skipping 181 matching lines @@
     ]
   }
 
   if (is_win) {
     deps += [ "//sandbox" ]
   }
 
   if (v8_use_external_startup_data) {
     deps += [ "//gin:gin" ]
   }
+
+  if (is_mac) {
+    deps += [ "//ui/accelerated_widget_mac" ]
+  }
 }
 
 # browsertest_support can be used by targets that run content_shell based
 # browser tests.
 source_set("browsertest_support") {
   testonly = true
 
   # See comment at the top of //content/BUILD.gn for why this is disabled in
   # component builds.
   if (is_component_build) {
@@ skipping 575 matching lines @@
     deps += [ "//third_party/iaccessible2" ]
   }
   if (is_mac) {
     # These flags are needed to run the test on Mac.
     # Search for comments about "xcode_settings" in chrome_tests.gypi.
     ldflags = [ "-Wl,-ObjC" ]
 
     deps += [
       "//third_party/mozilla",
       "//third_party/ocmock",
+      "//ui/accelerated_widget_mac",
     ]
   }
   if (is_chromeos) {
     sources -= [ "../browser/geolocation/wifi_data_provider_linux_unittest.cc" ]
     deps += [ "//chromeos" ]
   }
   if (is_android) {
     sources +=
         rebase_path(content_tests_gypi_values.content_unittests_android_sources,
                     ".",
@@ skipping 105 matching lines @@
 
 fuzzer_test("renderer_fuzzer") {
   sources = [
     "renderer_fuzzer.cc",
   ]
   deps = [
     ":test_support",
     "//content/shell:content_shell_lib",
   ]
 }