Enable precompiled headers for Blink on Windows

third_party/WebKit/Source/platform/BUILD.gn

Index: third_party/WebKit/Source/platform/BUILD.gn
diff --git a/third_party/WebKit/Source/platform/BUILD.gn b/third_party/WebKit/Source/platform/BUILD.gn
index cfffb1143e6e4f0a8159e3ea1fd1774471b869b8..01353b04a41b669407b205a9411f4a2a78450fc1 100644
--- a/third_party/WebKit/Source/platform/BUILD.gn
+++ b/third_party/WebKit/Source/platform/BUILD.gn
@@ -1,6 +1,6 @@
 # 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.
+# found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
@@ -46,6 +46,7 @@ component("blink_common") {
 
   configs += [
     "//build/config/compiler:wexit_time_destructors",
+    "//third_party/WebKit/Source:blink_pch",
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:non_test_config",
   ]
@@ -187,7 +188,7 @@ executable("character_data_generator") {
   ]
 }
 
-# Inspector protocol
+# Inspector protocol
 
 action("inspector_protocol_sources") {
   script = "inspector_protocol/CodeGenerator.py"
@@ -328,6 +329,7 @@ component("platform") {
   configs += [
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
+    "//third_party/WebKit/Source:blink_pch",
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:non_test_config",
   ]
@@ -478,6 +480,7 @@ source_set("test_support") {
   testonly = true
 
   configs += [
+    "//third_party/WebKit/Source:blink_pch",
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:inside_blink",
     "//third_party/WebKit/Source:non_test_config",
@@ -513,6 +516,7 @@ test("blink_heap_unittests") {
 
   configs += [
     "//third_party/WebKit/Source/wtf:wtf_config",
+    "//third_party/WebKit/Source:blink_pch",
     "//third_party/WebKit/Source:config",
   ]
 
@@ -563,6 +567,7 @@ test("blink_platform_unittests") {
 
   configs += [
     "//third_party/WebKit/Source/wtf:wtf_config",
+    "//third_party/WebKit/Source:blink_pch",
     "//third_party/WebKit/Source:config",
   ]
 
@@ -621,7 +626,7 @@ if (current_cpu == "arm") {
     #      ['OS=="android"', {
     #        'cflags!': ['-mthumb'],
     #      }],
-    #    ],
+    #    ],
 
     deps = [
       ":blink_common",