Call tracking allows advertisers to track phone calls originated from phone numbers displayed on their pages. This project aims to make call tracking available to AMP pages.

Design https://docs.google.com/document/d/1UDMYv0f2R9CvMUSBQhxjtkSnC4984t9dJeqwm_8WiAM/edit?usp=sharing

For feature request see #5276