Add Store+Sync to reading list.

ios/chrome/browser/reading_list/proto/BUILD.gn

Index: ios/chrome/browser/reading_list/proto/BUILD.gn
diff --git a/chrome/browser/android/webapk/BUILD.gn b/ios/chrome/browser/reading_list/proto/BUILD.gn
similarity index 77%
copy from chrome/browser/android/webapk/BUILD.gn
copy to ios/chrome/browser/reading_list/proto/BUILD.gn
index 6bcd0ac4dc479305465907faf565904972b09a00..927a5eea83e167675b2cb6fee3186b0fced0cffa 100644
--- a/chrome/browser/android/webapk/BUILD.gn
+++ b/ios/chrome/browser/reading_list/proto/BUILD.gn
@@ -6,6 +6,9 @@ import("//third_party/protobuf/proto_library.gni")
 
 proto_library("proto") {
   sources = [
-    "webapk.proto",
+    "reading_list.proto",
+  ]
+  deps = [
+    "//components/sync/protocol",
   ]
 }