luci-py/isolateserver.py: Add archive support when downloading.

client/run_isolated.py

Index: client/run_isolated.py
diff --git a/client/run_isolated.py b/client/run_isolated.py
index 68a644f33cd723a30310faf6c649ddc64dc6522a..256d44278e276672b5271d7d57497939fdd4a69d 100755
--- a/client/run_isolated.py
+++ b/client/run_isolated.py
@@ -91,6 +91,7 @@ def get_as_zip_package(executable=True):
   package.add_python_file(os.path.join(BASE_DIR, 'isolateserver.py'))
   package.add_python_file(os.path.join(BASE_DIR, 'auth.py'))
   package.add_python_file(os.path.join(BASE_DIR, 'cipd.py'))
+  package.add_directory(os.path.join(BASE_DIR, 'libs'))
   package.add_directory(os.path.join(BASE_DIR, 'third_party'))
   package.add_directory(os.path.join(BASE_DIR, 'utils'))
   return package
@@ -270,7 +271,7 @@ def fetch_and_measure(isolated_hash, storage, cache, outdir):
     'initial_size': cache.initial_size,
     'items_cold': base64.b64encode(large.pack(sorted(cache.added))),
     'items_hot': base64.b64encode(
-        large.pack(sorted(set(cache.linked) - set(cache.added)))),
+        large.pack(sorted(set(cache.used) - set(cache.added)))),
   }