Update bower.json for Polymer elements and add PRESUBMIT.py

ui/webui/resources/polymer_resources.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!--
   This file is generated.
   Please use 'src/tools/polymer/polymer_grdp_to_txt.py' and
   'src/tools/polymer/txt_to_polymer_grdp.py' to modify it, if possible.
 
   'polymer_grdp_to_txt.py' converts 'polymer_resources.grdp' to a plane list of
-  used Polymer components. v1.0 elements are marked with 'v1.0 ' prefix:
+  used Polymer components:
     ...
-    v1.0 iron-iron-iconset/iron-iconset-extracted.js
-    v1.0 iron-iron-iconset/iron-iconset.html
+    iron-iron-iconset/iron-iconset-extracted.js
+    iron-iron-iconset/iron-iconset.html
     ...
 
   'txt_to_polymer_grdp.py' converts list back to GRDP file.
 
   Usage:
     $ polymer_grdp_to_txt.py polymer_resources.grdp > /tmp/list.txt
     $ vim /tmp/list.txt
     $ txt_to_polymer_grdp.py /tmp/list.txt > polymer_resources.grdp
 -->
 <grit-part>
   <!-- Polymer 1.0 -->
+  <structure name="IDR_POLYMER_1_0_FONT_ROBOTO_ROBOTO_HTML"
+             file="../../../third_party/polymer/v1_0/components-chromium/font-roboto/roboto.html"
+             type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_IRON_A11Y_KEYS_BEHAVIOR_IRON_A11Y_KEYS_BEHAVIOR_EXTRACTED_JS"
              file="../../../third_party/polymer/v1_0/components-chromium/iron-a11y-keys-behavior/iron-a11y-keys-behavior-extracted.js"
              type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_IRON_A11Y_KEYS_BEHAVIOR_IRON_A11Y_KEYS_BEHAVIOR_HTML"
              file="../../../third_party/polymer/v1_0/components-chromium/iron-a11y-keys-behavior/iron-a11y-keys-behavior.html"
              type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_IRON_BEHAVIORS_IRON_BUTTON_STATE_EXTRACTED_JS"
              file="../../../third_party/polymer/v1_0/components-chromium/iron-behaviors/iron-button-state-extracted.js"
              type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_IRON_BEHAVIORS_IRON_BUTTON_STATE_HTML"
@@ skipping 594 matching lines @@
              file="../../../third_party/polymer/v1_0/components-chromium/polymer/polymer-mini.html"
              type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_POLYMER_POLYMER_HTML"
              file="../../../third_party/polymer/v1_0/components-chromium/polymer/polymer.html"
              type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_WEB_ANIMATIONS_JS_WEB_ANIMATIONS_NEXT_LITE_MIN_JS"
              file="../../../third_party/web-animations-js/sources/web-animations-next-lite.min.js"
              type="chrome_html" />
 </grit-part>