[ios] Adds a LocationBarController interface.

ios/shared/chrome/browser/ui/omnibox/BUILD.gn

Index: ios/shared/chrome/browser/ui/omnibox/BUILD.gn
diff --git a/ios/shared/chrome/browser/ui/omnibox/BUILD.gn b/ios/shared/chrome/browser/ui/omnibox/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..c27a6a17314da57154a8137862d8569ab1d3e19a
--- /dev/null
+++ b/ios/shared/chrome/browser/ui/omnibox/BUILD.gn
@@ -0,0 +1,17 @@
+# 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.
+
+source_set("omnibox") {
+  sources = [
+    "location_bar_controller.cc",
+    "location_bar_controller.h",
+    "location_bar_delegate.h",
+    "web_omnibox_edit_controller.cc",
+    "web_omnibox_edit_controller.h",
+  ]
+  deps = [
+    "//base",
+    "//components/omnibox/browser",
+  ]
+}