Start archiving metrics_metadata with builds.

chrome/tools/build/win/FILES.cfg

 # -*- python -*-
 # ex: set syntax=python:
 
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This is a buildbot configuration file containing a tagged list of files
 # processed by the stage/archive scripts. The known tags are:
 #
@@ skipping 750 matching lines @@
     'buildtype': ['dev'],
     'archive': 'content-shell.zip',
     'optional': ['dev'],
   },
   {
     'filename': 'resources',
     'buildtype': ['dev'],
     'archive': 'content-shell.zip',
     'optional': ['dev'],
   },
+  # Metrics metadata files:
+  {
+    'filename': 'actions.xml',
+    'buildtype': ['dev', 'official'],
+    'archive': 'metrics-metadata.zip',
+    'optional': ['dev', 'official'],
+  },
+  {
+    'filename': 'histograms.xml',
+    'buildtype': ['dev', 'official'],
+    'archive': 'metrics-metadata.zip',
+    'optional': ['dev', 'official'],
+  },
+  {
+    'filename': 'rappor.xml',
+    'buildtype': ['dev', 'official'],
+    'archive': 'metrics-metadata.zip',
+    'optional': ['dev', 'official'],
+  },
 ]