Add precompiled headers to GN build for large targets.

cc/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("//testing/test.gni")
 
 component("cc") {
   sources = [
     "animation/animation.cc",
     "animation/animation.h",
@@ skipping 491 matching lines @@
     "trees/tree_synchronizer.h",
   ]
 
   if (target_cpu == "x86" || target_cpu == "x64") {
     sources += [
       "raster/texture_compressor_etc1_sse.cc",
       "raster/texture_compressor_etc1_sse.h",
     ]
   }
 
+  configs += [ "//build/config:precompiled_headers" ]
+
   public_deps = [
     "//cc/base",
     "//skia",
   ]
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
     "//cc/surfaces:surface_id",
     "//gpu",
     "//gpu/command_buffer/client:gles2_interface",
@@ skipping 133 matching lines @@
     "test/test_task_graph_runner.cc",
     "test/test_task_graph_runner.h",
     "test/test_texture.cc",
     "test/test_texture.h",
     "test/test_tile_priorities.cc",
     "test/test_tile_priorities.h",
     "test/test_web_graphics_context_3d.cc",
     "test/test_web_graphics_context_3d.h",
   ]
 
+  configs += [ "//build/config:precompiled_headers" ]
   include_dirs = [
     ".",
     "test",
   ]
 
   public_deps = [
     ":cc",
     "//gpu:test_support",
   ]
   deps = [
@@ skipping 163 matching lines @@
     "surfaces/surface_aggregator_test_helpers.h",
     "surfaces/surface_aggregator_unittest.cc",
     "surfaces/surface_unittest.cc",
     "surfaces/surfaces_pixeltest.cc",
 
     # Setup.
     "test/cc_test_suite.cc",
     "test/run_all_unittests.cc",
   ]
 
+  configs += [ "//build/config:precompiled_headers" ]
   data = [
     "test/data/",
   ]
 
   deps = [
     ":cc",
     ":test_support",
     "//base/test:test_support",
     "//cc/surfaces",
     "//cc/surfaces:surface_id",
@@ skipping 54 matching lines @@
     "//ui/gl",
     "//ui/gl:test_support",
   ]
 
   if (is_android) {
     isolate_file = "cc_perftests.isolate"
   }
 }
 # When adding support for isolates, please have a look at run-time dependencies
 # in the cc_unittests_run target in cc_tests.gyp.