Created the dialog offering the user to merge their account data or keep it

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

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 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. -->
 
 <resources>
     <!-- Connection info popup dimensions -->
     <dimen name="connection_info_padding_wide">24dp</dimen>
     <dimen name="connection_info_padding_thin">16dp</dimen>
 
@@ skipping 149 matching lines @@
     <dimen name="badged_user_picture_width">46dp</dimen>
     <dimen name="badge_radius">10dp</dimen>
     <dimen name="badge_border_size">1.3dp</dimen>
 
     <!-- First Run Experience and Welcome Page dimensions -->
     <dimen name="fre_button_padding">12dp</dimen>
     <dimen name="fre_margin">24dp</dimen>
     <dimen name="fre_title_text_size">24sp</dimen>
     <dimen name="fre_button_text_size">14sp</dimen>
     <dimen name="fre_normal_text_size">14sp</dimen>
-    <dimen name="fre_image_carousel_width">260dp</dimen>
-    <dimen name="fre_image_carousel_height">130dp</dimen>
-    <dimen name="fre_checkmark_size">38dp</dimen>
+    <dimen name="fre_image_height">130dp</dimen>
+    <dimen name="fre_largest_image_width">260dp</dimen>
     <dimen name="fre_tos_checkbox_padding">12dp</dimen>
 
+    <!-- Account Signin dimensions -->
+    <dimen name="signin_button_padding">12dp</dimen>

[newt (away), 2016/02/25 18:01:32]

I don't think it's worth duplicating these dimens. If they're duplicated, they
can get out of sync with the fre dimens. I'd just use the fre dimens with the
understanding that the sign in view can appear outside of FRE, but needs to
match the FRE style.

[PEConn, 2016/02/25 20:45:11]

Done.

+    <dimen name="signin_margin">24dp</dimen>
+    <dimen name="signin_title_text_size">24sp</dimen>
+    <dimen name="signin_normal_text_size">14sp</dimen>
+    <dimen name="signin_image_carousel_width">260dp</dimen>
+    <dimen name="signin_image_carousel_height">130dp</dimen>
+    <dimen name="signin_checkmark_size">38dp</dimen>
+
     <!-- Sign-in promo dimensions -->
     <dimen name="sign_in_promo_padding_bottom">16dp</dimen>
 
     <!-- Autofill card unmasking prompt dimensions -->
     <dimen name="autofill_card_unmask_tooltip_horizontal_padding">16dp</dimen>
     <dimen name="autofill_card_unmask_tooltip_vertical_padding">4dp</dimen>
 
     <!-- Alert dialog -->
     <dimen name="dialog_padding_top">@dimen/abc_dialog_padding_top_material</dimen>
     <dimen name="dialog_padding_sides">@dimen/abc_dialog_padding_material</dimen>
@@ skipping 130 matching lines @@
 
     <!-- Account chooser dialog dimensions -->
     <dimen name="account_chooser_dialog_margin">24dp</dimen>
     <dimen name="account_chooser_dialog_item_margin">20dp</dimen>
     <dimen name="account_chooser_dialog_title_main_text_size">18sp</dimen>
     <dimen name="account_chooser_dialog_title_descriptive_text_size">16sp</dimen>
 
     <!-- Clear browsing data preferences dimensions -->
     <dimen name="clear_browsing_data_checkbox_height">56dp</dimen>
 </resources>