[ios clean] Moves animator and presenters under transitions

ios/clean/chrome/browser/ui/transitions/BUILD.gn

Index: ios/clean/chrome/browser/ui/transitions/BUILD.gn
diff --git a/ios/clean/chrome/browser/ui/transitions/BUILD.gn b/ios/clean/chrome/browser/ui/transitions/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..0fb5b0bc6515b3dab38f73bb738c94b1a2df5f9b
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/transitions/BUILD.gn
@@ -0,0 +1,20 @@
+# 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("transitions") {
+  sources = [
+    "zoom_transition_controller.h",
+    "zoom_transition_controller.mm",
+    "zooming_menu_transition_controller.h",
+    "zooming_menu_transition_controller.mm",
+  ]
+
+  configs += [ "//build/config/compiler:enable_arc" ]
+
+  deps = [
+    "//base",
+    "//ios/clean/chrome/browser/ui/transitions/animators",
+    "//ios/clean/chrome/browser/ui/transitions/presenters",
+  ]
+}