* master: (34 commits)
  Prevent amp-carousel next/previous icons fade away on desktop (ampproject#8428)
  Turn on flag slidescroll-disable-css-snap” (ampproject#8436)
  Revert "temporarily turn off yarn (ampproject#8356)" (ampproject#8384)
  initial commit (ampproject#8404)
  Upgrades for Index Exchange amp-ad tags to report load statistics (ampproject#8054)
  amp-bind validation tweak (ampproject#8414)
  Fix an amp-instagram race condition (ampproject#8192)
  Use whitelist to restrict urlReplacement for scoped analytics element (ampproject#8360)
  Report active experiments in error logs (ampproject#8108)
  amp-bind: Catch exceptions in mutatedAttributesCallback (ampproject#8383)
  Fixing custom scroll-snap on IOS (ampproject#8391)
  Add experiment for using AmpContext class in integration.js (ampproject#8348)
  add (ampproject#8349)
  swipe api (ampproject#8357)
  skip 3 flaky tests (ampproject#8388)
  amp-bind: Expression complexity limit (ampproject#8321)
  add margin-bottom (ampproject#8350)
  Flying carpet: make container full viewport and center content (ampproject#8292)
  Service Registration: Document Click (ampproject#7882)
  Add a8ad (ampproject#8036)
  ...