Add precompiled headers to GN build for large targets.

skia/BUILD.gn

 # Copyright (c) 2013 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("//build/config/ui.gni")
 import("//testing/test.gni")
 if (current_cpu == "arm") {
   import("//build/config/arm.gni")
 }
@@ skipping 423 matching lines @@
   if (is_clang) {
     # Skia won't compile with some of the more strict clang warnings.
     # e.g. it does:
     #  SkASSERT(!"sk_out_of_memory");
     configs -= [ "//build/config/clang:extra_warnings" ]
   }
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":skia_library_config",
+    "//build/config:precompiled_headers",
     "//build/config/compiler:no_chromium_code",
   ]
   public_configs = [ ":skia_config" ]
 
   deps = [
     ":skia_opts",
     "//base",
     "//base/third_party/dynamic_annotations",
     "//third_party/zlib",
   ]
@@ skipping 184 matching lines @@
       "tools/filter_fuzz_stub/filter_fuzz_stub.cc",
     ]
 
     deps = [
       ":skia",
       "//base",
       "//base/test:test_support",
     ]
   }
 }