Use more than double buffering in SoftwareOutputDeviceMac

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 6935ee3a77802e6d0c5400bbbae8b694f51b9a16..00a498476fe9a2a5203ea1bf0b463693ec1acfd9 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -1070,6 +1070,7 @@ test("content_unittests") {
     "../browser/cocoa/system_hotkey_map_unittest.mm",
     "../browser/compositor/reflector_impl_unittest.cc",
     "../browser/compositor/software_browser_compositor_output_surface_unittest.cc",
+    "../browser/compositor/software_output_device_mac_unittest.mm",
     "../browser/compositor/software_output_device_ozone_unittest.cc",
     "../browser/devtools/devtools_http_handler_unittest.cc",
     "../browser/devtools/devtools_manager_unittest.cc",
@@ -1688,6 +1689,7 @@ test("content_unittests") {
       "//third_party/ocmock",
       "//ui/accelerated_widget_mac",
     ]
+    libs = [ "IOSurface.framework" ]
   }
   if (is_chromeos) {
     deps += [ "//chromeos" ]