Add unit test and showcase support for search widget.

ios/chrome/search_widget_extension/BUILD.gn

 # Copyright 2017 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/ios/rules.gni")
 import("//build/config/mac/base_rules.gni")
 import("//build/mac/tweak_info_plist.gni")
 import("//ios/build/chrome_build.gni")
 
 tweak_info_plist("tweak_info_plist") {
   info_plist = "Info.plist"
 }
 
 compile_plist("entitlements") {
   format = "xml1"
   substitutions = [ "IOS_BUNDLE_ID_PREFIX=$ios_app_bundle_id_prefix" ]
   output_name = "$target_gen_dir/search_widget_extension.appex.entitlements"
   plist_templates =
       [ "entitlements/external/search_widget_extension.appex.entitlements" ]
 }
 
 ios_appex_bundle("search_widget_extension") {
+  deps = [
+    ":search_widget",
+  ]
+
+  extra_substitutions = [
+    "CHROME_CHANNEL_SCHEME=$url_channel_scheme",
+    "CHROMIUM_SHORT_NAME=$chromium_short_name",
+    "WIDGET_EXTENSION_BUNDLE_ID=$chromium_bundle_id.SearchTodayExtension",
+  ]
+
+  configs += [ "//build/config/compiler:enable_arc" ]

[sdefresne, 2017/04/19 15:54:56]

There are no "sources" in that target, so you can remove this line.

[lody, 2017/04/19 16:01:53]

Done.

+
+  entitlements_target = ":entitlements"
+  info_plist_target = ":tweak_info_plist"
+}
+
+source_set("search_widget") {
   sources = [
     "search_widget_view.h",
     "search_widget_view.mm",
     "search_widget_view_controller.h",
     "search_widget_view_controller.mm",
   ]
 
   deps = [
     "//base",
     "//components/open_from_clipboard:open_from_clipboard_impl",
-    "//components/prefs",
-    "//components/variations",
-    "//components/version_info",
-    "//ios/chrome/common",
     "//ios/chrome/common/app_group",
-    "//ios/chrome/common/app_group:client",
-    "//ios/chrome/common/physical_web",
-    "//ios/chrome/today_extension/strings",
-    "//ios/third_party/material_components_ios",
-    "//net",
-    "//ui/base",
   ]
 
   libs = [
     "Foundation.framework",
     "NotificationCenter.framework",
     "UIKit.framework",
   ]
 
-  extra_substitutions = [
-    "CHROME_CHANNEL_SCHEME=$url_channel_scheme",
-    "CHROMIUM_SHORT_NAME=$chromium_short_name",
-    "WIDGET_EXTENSION_BUNDLE_ID=$chromium_bundle_id.SearchTodayExtension",
+  configs += [ "//build/config/compiler:enable_arc" ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "search_widget_view_controller_unittest.mm",
   ]
-
+  deps = [
+    ":search_widget",
+    "//testing/gtest",
+  ]
   configs += [ "//build/config/compiler:enable_arc" ]
-
-  entitlements_target = ":entitlements"
-  info_plist_target = ":tweak_info_plist"
 }