Gallery: Add extern of analytics.js to Gallery.

ui/file_manager/gallery/js/compiled_resources.gyp

 # Copyright 2014 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.
 {
   'targets': [
     {
       'target_name': 'background',
       'variables': {
         'depends': [
           '../../../../third_party/jstemplate/compiled_resources.gyp:jstemplate',
@@ skipping 80 matching lines @@
           './gallery_util.js',
           './mosaic_mode.js',
           './ribbon.js',
           './slide_mode.js',
         ],
         'externs': [
           '<(CLOSURE_DIR)/externs/chrome_send_externs.js',
           '<(CLOSURE_DIR)/externs/chrome_extensions.js',
           '<(CLOSURE_DIR)/externs/file_manager_private.js',
           '<(CLOSURE_DIR)/externs/metrics_private.js',
+          '../../../../third_party/analytics/externs.js',
           '../../externs/chrome_test.js',
           '../../externs/exif_entry.js',
           '../../externs/gallery_foreground.js',
           '../../externs/platform.js',
           '../../externs/webview_tag.js',
         ],
       },
       'includes': [
         '../../../../third_party/closure_compiler/compile_js.gypi'
       ],
     }
   ],
 }