Adding search widget UI and functionality.

ios/chrome/search_widget_extension/BUILD.gn

Index: ios/chrome/search_widget_extension/BUILD.gn
diff --git a/ios/chrome/search_widget_extension/BUILD.gn b/ios/chrome/search_widget_extension/BUILD.gn
index 4b632490e6e12e935e5972a5968cc2eb6ea1639e..b6923b0046ee2b2cd264f9718500ffd3cca49184 100644
--- a/ios/chrome/search_widget_extension/BUILD.gn
+++ b/ios/chrome/search_widget_extension/BUILD.gn
@@ -43,6 +43,7 @@ source_set("search_widget") {
   ]
 
   deps = [
+    ":resources",
     "//base",
     "//components/open_from_clipboard:open_from_clipboard_impl",
     "//ios/chrome/common/app_group",
@@ -68,3 +69,24 @@ source_set("unit_tests") {
   ]
   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}}",
+  ]
+}