Adding search widget UI and functionality.

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") {
@@ skipping 22 matching lines @@
   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",
+    "ui_util.h",
+    "ui_util.mm",
   ]
 
   deps = [
+    ":resources",
     "//base",
     "//components/open_from_clipboard:open_from_clipboard_impl",
     "//ios/chrome/common/app_group",
   ]
 
   libs = [
     "Foundation.framework",
     "NotificationCenter.framework",
     "UIKit.framework",
   ]
 
   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" ]
 }
+
+bundle_data("resources") {
+  visibility = [ ":*" ]
+  sources = [
+    "resources/quick_action_camera_search.png",
+    "resources/quick_action_camera_search@2x.png",
+    "resources/quick_action_camera_search@3x.png",
+    "resources/quick_action_incognito_search.png",
+    "resources/quick_action_incognito_search@2x.png",
+    "resources/quick_action_incognito_search@3x.png",
+    "resources/quick_action_search.png",
+    "resources/quick_action_search@2x.png",
+    "resources/quick_action_search@3x.png",
+    "resources/quick_action_voice_search.png",
+    "resources/quick_action_voice_search@2x.png",
+    "resources/quick_action_voice_search@3x.png",
+  ]
+  outputs = [
+    "{{bundle_resources_dir}}/{{source_file_part}}",
+  ]
+}