Add search_engines and precache components to GN build.

components/search_engines/BUILD.gn

Index: components/search_engines/BUILD.gn
diff --git a/components/search_engines/BUILD.gn b/components/search_engines/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..734ec72b41b36c705ce044b08c4fdb9765d60588
--- /dev/null
+++ b/components/search_engines/BUILD.gn
@@ -0,0 +1,73 @@
+# 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("//tools/json_to_struct/json_to_struct.gni")
+
+static_library("search_engines") {
+  sources = [
+    "default_search_manager.cc",
+    "default_search_manager.h",
+    "default_search_policy_handler.cc",
+    "default_search_policy_handler.h",
+    "keyword_table.cc",
+    "keyword_table.h",
+    "keyword_web_data_service.cc",
+    "keyword_web_data_service.h",
+    "search_engine_type.h",
+    "search_engines_pref_names.cc",
+    "search_engines_pref_names.h",
+    "search_engines_switches.cc",
+    "search_engines_switches.h",
+    "search_host_to_urls_map.cc",
+    "search_host_to_urls_map.h",
+    "search_terms_data.cc",
+    "search_terms_data.h",
+    "template_url.cc",
+    "template_url.h",
+    "template_url_data.cc",
+    "template_url_data.h",
+    "template_url_fetcher.cc",
+    "template_url_fetcher.h",
+    "template_url_id.h",
+    "template_url_parser.cc",
+    "template_url_parser.h",
+    "template_url_prepopulate_data.cc",
+    "template_url_prepopulate_data.h",
+    "template_url_service.cc",
+    "template_url_service.h",
+    "template_url_service_client.h",
+    "template_url_service_observer.h",
+    "util.cc",
+    "util.h",
+  ]
+
+  deps = [
+    ":prepopulated_engines",
+    "//base",
+    "//components/keyed_service/core",
+    "//components/metrics/proto",
+    "//components/policy",
+    "//components/pref_registry",
+    "//components/rappor",
+    "//components/strings",
+    "//components/url_fixer",
+    "//components/webdata/common",
+    "//google_apis",
+    "//net",
+    "//sql",
+    "//sync",
+    "//third_party/libxml",
+    "//ui/gfx",
+    "//url",
+    #'google_core_browser',  TODO(GYP)
+  ]
+}
+
+json_to_struct("prepopulated_engines") {
+  visibility = ":*"
+
+  source = "prepopulated_engines.json"
+  schema_file = "prepopulated_engines_schema.json"
+  namespace = "TemplateURLPrepopulateData"
+}