Upload/Download dart_snapshotter

mojo/public/dart/rules.gni

Index: mojo/public/dart/rules.gni
diff --git a/mojo/public/dart/rules.gni b/mojo/public/dart/rules.gni
index f02904109ed821f551f33aabbbcf58af3fa179fb..5074559f7c9743b8b04ac46d0ed2180b8ed49910 100644
--- a/mojo/public/dart/rules.gni
+++ b/mojo/public/dart/rules.gni
@@ -9,6 +9,7 @@
 # - dartzip_package
 # - dartzip_packaged_application
 
+import("../mojo.gni")
 import("//build/module_args/mojo.gni")
 import("//build/module_args/dart.gni")
 
@@ -16,6 +17,13 @@ template("dartx") {
   bundle_prefix = target_name
   bundle = "$target_gen_dir/${bundle_prefix}.dartx"
   snapshot = "$target_gen_dir/${bundle_prefix}_snapshot.bin"
+
+  if (mojo_use_prebuilt_dart_snapshotter) {
+    data_deps = [ rebase_path("mojo/public/tools:copy_dart_snapshotter",
+                              ".",
+                              mojo_root) ]
+  }
+
   dart_snapshotter = "$root_out_dir/dart_snapshotter"
   if (current_toolchain != host_toolchain) {
     toolchain_name = get_label_info(host_toolchain, "name")