Add icon to the Data Saver main menu footer and update to spec

chrome/android/java/res/values/dimens.xml

Index: chrome/android/java/res/values/dimens.xml
diff --git a/chrome/android/java/res/values/dimens.xml b/chrome/android/java/res/values/dimens.xml
index 464850cff0828c81cd07ec708b5ce8628aec11fc..2fe6cc01e94044bb38862a6f42d815186b382b68 100644
--- a/chrome/android/java/res/values/dimens.xml
+++ b/chrome/android/java/res/values/dimens.xml
@@ -145,6 +145,7 @@
 
     <!-- Data Saver -->
     <dimen name="data_usage_chart_height">252dp</dimen>
+    <dimen name="data_reduction_main_menu_icon_width">32dp</dimen>
 
     <!-- The size of the text for tab titles. -->
     <dimen name="compositor_tab_title_text_size">13sp</dimen>
@@ -450,4 +451,7 @@
     <!-- Context Menu Dimensions -->
     <dimen name="context_menu_header_image_min_size">56dp</dimen>
     <dimen name="context_menu_header_image_max_size">56dp</dimen>
+    
+    <!-- Divider Dimensions -->
+    <dimen name="divider_height">1dp</dimen>
 </resources>