run_isolated.py: install CIPD packages

client/isolateserver.py

Index: client/isolateserver.py
diff --git a/client/isolateserver.py b/client/isolateserver.py
index 1a679fcfcf1d58f95d3bf03be2e38857be83534c..bdc2edd25d3a6ecc831f6fda8448eef7474e9ae0 100755
--- a/client/isolateserver.py
+++ b/client/isolateserver.py
@@ -1523,6 +1523,16 @@ class DiskCache(LocalCache):
     with self._lock:
       self._linked.append(self._lru[digest])
 
+  def item_path(self, digest):
+    """Returns a path on disk of the cached item.
+
+    Raises:
+      CacheMiss if the item is not present in cache.
+    """
+    if digest not in self._lru:
+      raise CacheMiss(digest)
+    return self._path(digest)
+
   def _load(self):
     """Loads state of the cache from json file."""
     self._lock.assert_locked()