Add precompiled headers to GN build for large targets.

content/public/common/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/features.gni")
 import("//content/common/common.gni")
 import("//third_party/mojo/src/mojo/public/tools/bindings/mojom.gni")
 
 # See //content/BUILD.gn for how this works.
 group("common") {
@@ skipping 16 matching lines @@
   ]
 }
 
 source_set("common_sources") {
   visibility = [ "//content/*" ]
 
   sources = rebase_path(content_common_gypi_values.public_common_sources,
                         ".",
                         "//content")
 
-  configs += [ "//content:content_implementation" ]
+  configs += [
+    "//build/config:precompiled_headers",
+    "//content:content_implementation",
+  ]
 
   public_deps = [
     "//content/common",
     "//third_party/mojo/src/mojo/public/cpp/bindings",
   ]
   deps = [
     "//net",
     "//skia",
     "//third_party/WebKit/public:blink_headers",
     "//third_party/icu",
@@ skipping 10 matching lines @@
 }
 
 mojom("mojo_bindings") {
   sources = [
     "background_sync.mojom",
     "mojo_geoposition.mojom",
     "permission_status.mojom",
     "service_worker_event_status.mojom",
   ]
 }