Revert "Delete the ViewManager and WindowManager services."

mojo/services/view_manager/interfaces/BUILD.gn

Index: mojo/services/view_manager/interfaces/BUILD.gn
diff --git a/mojo/services/native_viewport/interfaces/BUILD.gn b/mojo/services/view_manager/interfaces/BUILD.gn
similarity index 70%
copy from mojo/services/native_viewport/interfaces/BUILD.gn
copy to mojo/services/view_manager/interfaces/BUILD.gn
index 49a7d96c9f7d93881e537ee310c2025d5b786b62..8d687a09f2b64b1fc3fa840ae16f4a4d07e1c952 100644
--- a/mojo/services/native_viewport/interfaces/BUILD.gn
+++ b/mojo/services/view_manager/interfaces/BUILD.gn
@@ -7,15 +7,19 @@ import("$mojo_sdk_root/mojo/public/tools/bindings/mojom.gni")
 
 mojom("interfaces") {
   sources = [
-    "native_viewport.mojom",
+    "animations.mojom",
+    "view_manager.mojom",
+    "view_manager_constants.mojom",
   ]
 
   import_dirs = [ get_path_info("../../", "abspath") ]
 
-  public_deps = [
+  mojo_sdk_deps = [ "mojo/public/interfaces/application" ]
+
+  deps = [
     "../../geometry/interfaces",
-    "../../gpu/interfaces",
     "../../input_events/interfaces",
+    "../../native_viewport/interfaces",
     "../../surfaces/interfaces:surface_id",
   ]
 }