[ios] Adds signin resources and styled text fields to ChromiumBrowserProvider.

ios/chrome/browser/providers/ui/BUILD.gn

Index: ios/chrome/browser/providers/ui/BUILD.gn
diff --git a/ios/chrome/browser/providers/ui/BUILD.gn b/ios/chrome/browser/providers/ui/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..2bfc848d1572d8a6f82ed7c19f327bb8eec54a50
--- /dev/null
+++ b/ios/chrome/browser/providers/ui/BUILD.gn
@@ -0,0 +1,16 @@
+# Copyright 2016 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.
+
+source_set("ui") {
+  sources = [
+    "chromium_styled_text_field.h",
+    "chromium_styled_text_field.mm",
+  ]
+  deps = [
+    "//base",
+    "//ios/public/provider/chrome/browser",
+  ]
+  libs = [ "UIKit.framework" ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}