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

ui/webui/resources/polymer_resources.grdp

Index: ui/webui/resources/polymer_resources.grdp
diff --git a/ui/webui/resources/polymer_resources.grdp b/ui/webui/resources/polymer_resources.grdp
index 192da2fe8b9b0d028a16721f9ec728a26465d36e..3bdfa2b3175ea07d996645b142cd4ed1e31622fe 100644
--- a/ui/webui/resources/polymer_resources.grdp
+++ b/ui/webui/resources/polymer_resources.grdp
@@ -5,10 +5,10 @@
   '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.
@@ -20,6 +20,9 @@
 -->
 <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" />