Add flag to switch between native and app notifications.

PiperOrigin-RevId: 836352152

sharing/BUILD

@@ -113,7 +113,6 @@ cc_library(
         "transfer_metadata.h",
         "transfer_metadata_builder.h",
     ],
-    compatible_with = ["//buildenv/target:non_prod"],
     visibility = [
         "//location/nearby/apps/better_together/windows/nearby_share:__subpackages__",
         "//location/nearby/cpp/sharing:__subpackages__",

sharing/flags/generated/nearby_sharing_feature_flags.h

@@ -104,6 +104,9 @@ constexpr auto kEnableFlutterHooks =
 // When true, enables the mini pulse animation.
 constexpr auto kEnableMiniPulse =
     flags::Flag<bool>(kConfigPackage, "45724244", false);
+// When true, enables notifications implemented in native code.
+constexpr auto kEnableNativeNotifications =
+    flags::Flag<bool>(kConfigPackage, "45743135", false);
 // When true, enables responsive UI.
 constexpr auto kEnableResponsiveUi =
     flags::Flag<bool>(kConfigPackage, "45727212", false);
@@ -128,6 +131,7 @@ inline absl::btree_map<int, const flags::Flag<bool>&> GetBoolFlags() {
       {45661130, kEnableConflictBanner},
       {45720206, kEnableFlutterHooks},
       {45724244, kEnableMiniPulse},
+      {45743135, kEnableNativeNotifications},
       {45727212, kEnableResponsiveUi},
   };
 }