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..bde5fc89f8cc46a88e3360841a7df30e6c5d0f15 100755
--- a/client/isolateserver.py
+++ b/client/isolateserver.py
@@ -1218,6 +1218,9 @@ class LocalCache(object):
     self._evicted = []
     self._linked = []
 
+  def __contains__(self, digest):
+    raise NotImplementedError()
+
   def __enter__(self):
     """Context manager interface."""
     return self
@@ -1302,6 +1305,10 @@ class MemoryCache(LocalCache):
     self._file_mode_mask = file_mode_mask
     self._contents = {}
 
+  def __contains__(self, digest):
+    with self._lock:
+      return digest in self._contents
+
   def cached_set(self):
     with self._lock:
       return set(self._contents)
@@ -1395,6 +1402,10 @@ class DiskCache(LocalCache):
         # self._load() calls self._trim() which initializes self._free_disk.
         self._load()
 
+  def __contains__(self, digest):
+    with self._lock:
+      return digest in self._lru
+
   def __enter__(self):
     return self