Minimize flicker by adding a   to nodes that will have

ui/webui/resources/webui_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This comment is only here because changes to resources are not picked up
 without changes to the corresponding grd file. -->
 <grit latest_public_release="0" current_release="1">
   <outputs>
     <output filename="grit/webui_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="grit/webui_resources_map.cc"
             type="resource_file_map_source" />
@@ skipping 191 matching lines @@
       <include name="IDR_WEBUI_IMAGES_TRASH"
                file="images/trash.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_CLOUDS"
                file="images/clouds.png" type="BINDATA" />
 
       <part file="cr_elements_images.grdp" />
     </includes>
     <structures>
       <structure name="IDR_WEBUI_CSS_ALERT_OVERLAY"
                  file="css/alert_overlay.css" type="chrome_html" />
+      <structure name="IDR_WEBUI_CSS_APPS_COMMON"
+                 file="css/apps/common.css" type="chrome_html" />
+      <structure name="IDR_WEBUI_CSS_APPS_TOPBUTTON_BAR"
+                 file="css/apps/topbutton_bar.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_BUBBLE"
                  file="css/bubble.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_BUBBLE_BUTTON"
                  file="css/bubble_button.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_BUTTER_BAR"
                  file="css/butter_bar.css" type="chrome_html" />
+      <structure name="IDR_WEBUI_CSS_CHROME"
+                 file="css/chrome_shared.css" type="chrome_html"
+                 flattenhtml="true" />

[Dan Beam, 2015/04/10 23:42:52]

alpha re-ordering

       <structure name="IDR_WEBUI_CSS_CONTROLLED_INDICATOR"
                  file="css/controlled_indicator.css" type="chrome_html" />
-      <structure name="IDR_WEBUI_CSS_APPS_COMMON"
-                 file="css/apps/common.css" type="chrome_html" />
-      <structure name="IDR_WEBUI_CSS_APPS_TOPBUTTON_BAR"
-                 file="css/apps/topbutton_bar.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_DIALOGS"
                  file="css/dialogs.css" type="chrome_html" />
+      <structure name="IDR_WEBUI_CSS_I18N_PROCESS"
+                 file="css/i18n_process.css" type="chrome_html" />

[Dan Beam, 2015/04/10 23:42:52]

new

       <structure name="IDR_WEBUI_CSS_LIST"
                  file="css/list.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_MENU"
                  file="css/menu.css" type="chrome_html"
                  flattenhtml="true" />
       <structure name="IDR_WEBUI_CSS_MENU_BUTTON"
                  file="css/menu_button.css" type="chrome_html"
                  flattenhtml="true" />
-      <structure name="IDR_WEBUI_CSS_CHROME"
-                 file="css/chrome_shared.css" type="chrome_html"
-                 flattenhtml="true" />
       <structure name="IDR_WEBUI_CSS_TEXT_DEFAULTS"
                  file="css/text_defaults.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_OVERLAY"
                  file="css/overlay.css" type="chrome_html"
                  flattenhtml="true" />
       <structure name="IDR_WEBUI_CSS_SPINNER"
                  file="css/spinner.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_TABLE"
                  file="css/table.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_TABS"
@@ skipping 144 matching lines @@
                    type="chrome_html" />
         <structure name="IDR_WEBUI_JS_UI_ACCOUNT_TWEAKS"
                    file="js/chromeos/ui_account_tweaks.js"
                    type="chrome_html" />
       </if>
       <part file="cr_elements_resources.grdp" />
       <part file="polymer_resources.grdp" />
     </structures>
   </release>
 </grit>