Adding GYP V2 targets for all Polymer code (with a script!).

third_party/polymer/v1_0/components-chromium/iron-behaviors/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.
 {
   'targets': [
     {
       'target_name': 'iron-button-state-extracted',
       'dependencies': [
         '../iron-a11y-keys-behavior/compiled_resources2.gyp:iron-a11y-keys-behavior-extracted',
+        'iron-control-state-extracted'
       ],
-      'includes': ['../../../../closure_compiler/compile_js2.gypi'],
+      'includes': [
+        '../../../../closure_compiler/compile_js2.gypi'
+      ]
     },
     {
       'target_name': 'iron-control-state-extracted',
-      'includes': ['../../../../closure_compiler/compile_js2.gypi'],
-    },
-  ],
-}
+      'includes': [
+        '../../../../closure_compiler/compile_js2.gypi'
+      ]
+    }
+  ]
+}