Add precompiled headers to GN build for large targets.

chrome/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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/chrome_tests.gni")
 import("//chrome/test/base/js2gtest.gni")
@@ skipping 66 matching lines @@
     "logging/win/log_file_printer.cc",
     "logging/win/log_file_printer.h",
     "logging/win/log_file_reader.cc",
     "logging/win/log_file_reader.h",
     "logging/win/mof_data_parser.cc",
     "logging/win/mof_data_parser.h",
     "logging/win/test_log_collector.cc",
     "logging/win/test_log_collector.h",
   ]
 
+  configs += [ "//build/config:precompiled_headers" ]
+
   # New deps should go in the non-iOS section below.
   public_deps = [
     "//content/test:test_support",
   ]
   deps = [
     "//base:prefs_test_support",
     "//base/test:test_support",
     "//chrome:resources",
     "//chrome:strings",
     "//chrome/app:test_support",
@@ skipping 124 matching lines @@
       "../common/safe_browsing/ipc_protobuf_message_test.proto",
     ]
   }
 
   test("interactive_ui_tests") {
     sources =
         rebase_path(chrome_tests_gypi_values.chrome_interactive_ui_test_sources,
                     ".",
                     "//chrome")
 
+    configs += [ "//build/config:precompiled_headers" ]
     defines = [ "HAS_OUT_OF_PROC_TEST_RUNNER" ]
     ldflags = []
 
     deps = [
       "//base/allocator",
       "//chrome/browser",
       "//chrome/browser/devtools",
       "//chrome/renderer",
       "//chrome/test:test_support",
       "//chrome:resources",
@@ skipping 299 matching lines @@
     ]
     sources +=
         rebase_path(chrome_tests_gypi_values.chrome_browser_tests_sources,
                     ".",
                     "//chrome")
     sources += rebase_path(
             chrome_tests_gypi_values.chrome_browser_extensions_test_support_sources,
             ".",
             "//chrome")
 
+    configs += [ "//build/config:precompiled_headers" ]
+
     deps = [
       ":browser_tests_js_webui",
       ":sync_integration_test_support",
       ":test_support",
       "//base",
       "//base:i18n",
       "//base/allocator",
       "//base/test:test_support",
       "//chrome:browser_tests_pak",
       "//chrome:packed_extra_resources",
@@ skipping 586 matching lines @@
               "//chrome")
     }
   }
 
   test("unit_tests") {
     sources =
         rebase_path(chrome_tests_unit_gypi_values.chrome_unit_tests_sources,
                     ".",
                     "//chrome")
 
+    configs += [ "//build/config:precompiled_headers" ]
     defines = []
 
     deps = [
       # NOTE: New depndencies should generally be added in the OS!="ios"
       # dependencies block below, rather than here.
       # Unit tests should only depend on:
       # 1) everything that the chrome binaries depend on:
       "//chrome:browser_dependencies",
       "//chrome:child_dependencies",
 
@@ skipping 604 matching lines @@
     "//third_party/mojo/src/mojo/edk/system",
   ]
 
   if (!is_android && use_ash) {
     sources += rebase_path(
             chrome_tests_unit_gypi_values.chrome_test_support_unit_ash_sources,
             ".",
             "//chrome")
   }
 }