Magento Google Content Experiments

original_page_layout_update.xml

<reference name="head">
    <block type="cms/block" name="gce" before="-" >
         <action method="setBlockId"><block_id>GOOGLE_CONTENT_EXPERIMENT_JS_CMS_BLOCK_ID_GOES_HERE</block_id></action> 
    </block>
</reference>

variation_page_layout_update.xml

<reference name="head">
    <action method="addLinkRel">
        <rel>canonical</rel>
        <href>ORIGINAL_PAGE_URL_GOES_HERE</href>
    </action>
</reference>
<!-- if you want to remove breadcumbs from the page, for example on a Home Page variation, add: -->
<remove name="breadcrumbs" />