Roll Polymer from 1.5.0 -> 1.6.0 to pick up native CSS custom props

third_party/polymer/v1_0/components-chromium/neon-animation/compiled_resources2.gyp

 # Copyright 2016 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.
 #
 # NOTE: Created with generate_compiled_resources_gyp.py, please do not edit.
 {
   'targets': [
     {
       'target_name': 'neon-animatable-behavior-extracted',
       'includes': ['../../../../closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'neon-animatable-extracted',
       'dependencies': [
         '../iron-resizable-behavior/compiled_resources2.gyp:iron-resizable-behavior-extracted',
         'neon-animatable-behavior-extracted',
       ],
       'includes': ['../../../../closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'neon-animated-pages-extracted',
       'dependencies': [
         '../iron-resizable-behavior/compiled_resources2.gyp:iron-resizable-behavior-extracted',
         '../iron-selector/compiled_resources2.gyp:iron-selectable-extracted',
-        'animations/compiled_resources2.gyp:opaque-animation-extracted',
         'neon-animation-runner-behavior-extracted',
       ],
       'includes': ['../../../../closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'neon-animation-behavior-extracted',
       'dependencies': [
         '../iron-meta/compiled_resources2.gyp:iron-meta-extracted',
       ],
       'includes': ['../../../../closure_compiler/compile_js2.gypi'],
@@ skipping 56 matching lines @@
         'neon-animation-behavior-extracted',
       ],
       'includes': ['../../../../closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'web-animations-extracted',
       'includes': ['../../../../closure_compiler/compile_js2.gypi'],
     },
   ],
 }