Save favicon during reading list distillation

ios/chrome/browser/dom_distiller/BUILD.gn

Index: ios/chrome/browser/dom_distiller/BUILD.gn
diff --git a/ios/chrome/browser/dom_distiller/BUILD.gn b/ios/chrome/browser/dom_distiller/BUILD.gn
index 67b4e9e30af5a4bb68066b54a345daa4a315539e..45d3b003c5dbc9db526e8c0d84da0f4996f758f0 100644
--- a/ios/chrome/browser/dom_distiller/BUILD.gn
+++ b/ios/chrome/browser/dom_distiller/BUILD.gn
@@ -8,17 +8,25 @@ source_set("dom_distiller") {
     "distiller_viewer.h",
     "dom_distiller_service_factory.cc",
     "dom_distiller_service_factory.h",
+    "favicon_observer_factory_impl.h",
+    "favicon_observer_factory_impl.mm",
   ]
   deps = [
     "//base",
     "//components/dom_distiller/core",
     "//components/dom_distiller/ios",
+    "//components/favicon/ios",
     "//components/keyed_service/core",
     "//components/keyed_service/ios",
     "//components/leveldb_proto",
+    "//ios/chrome/browser/bookmarks",
     "//ios/chrome/browser/browser_state",
+    "//ios/chrome/browser/favicon",
+    "//ios/chrome/browser/history",
+    "//ios/public/provider/web",
     "//ios/web",
     "//ui/gfx",
+    "//url",
   ]
   public_deps = [
     "//components/dom_distiller/core",