Add search_engines and precache components to GN build.

components/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.
 
 # Collection of all components. You wouldn't link to this, but this is rather
 # to reference the files so they can be compiled by the build system.
 group("all_components") {
   visibility = "//:*"  # Only for the root targets to bring in.
 
   deps = [
@@ skipping 19 matching lines @@
     "//components/history/core/test",
     "//components/json_schema",
     "//components/language_usage_metrics",
     "//components/leveldb_proto",
     "//components/metrics",
     "//components/navigation_metrics",
     "//components/omaha_query_params",
     "//components/onc",
     "//components/os_crypt",
     "//components/policy",
+    "//components/precache/core",
+    "//components/precache/content",
     "//components/pref_registry",
     "//components/query_parser",
     "//components/rappor",
     "//components/resources:components_resources",
+    "//components/search_engines",
     "//components/startup_metric_utils",
     "//components/strings",
     "//components/tracing",
     "//components/translate/content/browser",
     "//components/translate/content/common",
     "//components/translate/content/renderer",
     "//components/translate/core/browser",
     "//components/translate/core/common",
     "//components/url_fixer",
     "//components/url_matcher",
@@ skipping 30 matching lines @@
       "//components/dom_distiller/core",  # Blocked on content.
       "//components/domain_reliability",  # Blocked on content.
       "//components/favicon_base",  # Should work, needs checking.
       "//components/favicon/core",  # Blocked on keyed service.
       "//components/feedback",  # Blocked on content.
       "//components/history/core/browser",  # Should work, needs checking.
       "//components/history/core/common",  # Should work, needs checking.
       "//components/history/core/test",  # Should work, needs checking.
       "//components/json_schema",  # Should work, needs checking.
       "//components/keyed_service/content",  # Blocked on content.
+      "//components/precache/core",  # Should work, needs checking.
+      "//components/precache/content",  # Blocked on content.
       "//components/policy",  # Blocked on content (indirectly via autofill).
       "//components/rappor",  # Should work, needs checking.
+      "//components/search_engines",  # Should work, needs checking.
       "//components/translate/content/browser",  # Blocked on content.
       "//components/translate/content/common",  # Blocked on content.
       "//components/translate/content/renderer",  # Blocked on content.
       "//components/usb_service",  # Blocked on content.
       "//components/user_prefs",  # Blocked on content.
       "//components/visitedlink/browser",  # Blocked on content.
       "//components/visitedlink/common",  # Blocked on content.
       "//components/visitedlink/renderer",  # Blocked on blink
       "//components/web_modal",  # Blocked on content.
     ]
   }
 
   if (!is_ios && !is_android) {
     deps += [
       "//components/storage_monitor",
     ]
   }
 }
+
+# TODO(GYP) components_unittests
+#test("components_unittests") {
+##  # Precache tests need these defines.
+#  configs += [ "//components/precache/core:precache_config" ]
+#}