Enable precompiled headers for Blink on Windows

third_party/WebKit/Source/web/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/ui.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 import("//third_party/WebKit/Source/modules/modules.gni")
@@ skipping 15 matching lines @@
     "//third_party/WebKit/Source/modules",
     "//third_party/WebKit/Source/platform",
     "//third_party/angle:translator",
     "//third_party/icu",
     "//ui/gfx/geometry",
     "//v8",
   ]
 
   configs += [
     "//build/config/compiler:wexit_time_destructors",
+    "//third_party/WebKit/Source:blink_pch",
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:inside_blink",
     "//third_party/WebKit/Source:non_test_config",
   ]
 
   defines = [ "BLINK_WEB_IMPLEMENTATION=1" ]
 
   sources = web_gypi.web_files
 
   if (!use_default_render_theme) {
@@ skipping 26 matching lines @@
     "//third_party/WebKit/Source/core:testing",
     "//third_party/WebKit/Source/modules:modules_testing",
     "//third_party/WebKit/Source/wtf",
     "//v8",
   ]
 
   sources = [
     "WebTestingSupport.cpp",
   ]
 
-  configs += [ "//third_party/WebKit/Source:config" ]
+  configs += [
+    "//third_party/WebKit/Source:blink_pch",
+    "//third_party/WebKit/Source:config",
+  ]
 
   include_dirs = [ "$root_gen_dir/blink" ]
 }
 
 group("webkit_unit_tests_data") {
   data = [
     "tests/data/",
     "../core/paint/test_data/",
   ]
 }
@@ skipping 33 matching lines @@
   sources = [
     "tests/RunAllTests.cpp",
   ]
   sources += web_unittest_files
   sources += bindings_unittest_files
   sources += core_unittest_files
   sources += modules_unittest_files
   sources += platform_web_unittest_files
 
   configs += [
+    "//third_party/WebKit/Source:blink_pch",
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:inside_blink",
   ]
 
   if (is_android) {
     deps += [
       "//base:base_java",
       "//content/public/android:content_java",
       "//content/shell/android:content_shell_assets",
       "//net/android:net_java",
     ]
   }
 }