Split ui.lib to avoid hitting 4 GB limit

chrome/browser/ui/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/chromecast_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
 import("//device/vr/features.gni")
 import("//extensions/features/features.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
 import("//rlz/features/features.gni")
 import("//ui/base/ui_features.gni")
 
 config("ui_warnings") {
   if (is_clang) {
     # TODO(thakis): Remove this once http://crbug.com/383820 is figured out
     cflags = [ "-Wno-nonnull" ]
   }
 }
 
 # Use a static library here because many test binaries depend on this but don't
 # require many files from it. This makes linking more efficient.
 split_static_library("ui") {
-  # Split into multiple static libraries on Windows official builds, where we
-  # run into a 2GB max size limit.
-  if (is_win && is_official_build) {
+  # Split into multiple static libraries on Windows builds. We have hit size
+  # limits on Windows official builds and on goma builds when symbol_level = 2
+  # is selected. Always splitting on Windows builds is simpler than trying to
+  # perfectly calculate the scenarios where it is required.
+  if (is_win) {
     split_count = 5
   } else {
     split_count = 1
   }
 
   sources = [
     "accelerator_utils.h",
     "android/android_about_app_info.cc",
     "android/android_about_app_info.h",
     "android/external_protocol_dialog_android.cc",
@@ skipping 3491 matching lines @@
       "test/test_confirm_bubble_model.cc",
       "test/test_confirm_bubble_model.h",
     ]
     deps += [ "//chrome/test:test_support_ui" ]
   }
 
   if (enable_extensions) {
     deps += [ "//extensions/browser" ]
   }
 }