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") {
-  sources = [
-    "search_widget_view.h",
-    "search_widget_view.mm",
-    "search_widget_view_controller.h",
-    "search_widget_view_controller.mm",
-  ]
-
   deps = [
+    ":search_widget",
     "//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",
@@ skipping 12 matching lines @@
     "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" ]
 
   entitlements_target = ":entitlements"
   info_plist_target = ":tweak_info_plist"
 }
+
+source_set("search_widget") {
+  sources = [
+    "search_widget_view.h",

[lpromero, 2017/04/13 17:26:08]

You also need to move to this source_set the deps needed for these files.

[lody, 2017/04/14 13:56:09]

Done.

+    "search_widget_view.mm",
+    "search_widget_view_controller.h",
+    "search_widget_view_controller.mm",
+  ]
+  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" ]
+}