Issue tracker for moving some macros in url-replacement.js to amp-analytics:
Related to this

Size reduction ~300 bytes to v0.js (0.3%) and 15% of all macros.

• first_contentful_paint, make_body_visible, first_viewport_ready
• story_page_id, story_page_index
• scroll_left, scroll_top
• timezone_code
• ancestor_origin
• video_state
• amp_state