Small lint fixes (from pulling this into our internal codebase). (amp…

…project#3262)

Disables cross-iframe code sharing for Twitter. (ampproject#3242)

Fixes loading of tweets in browsers that do iframe throttling, because they would sometimes throttle operations that belong to a visible fame, but are attributed to the master frame.

Workaround for ampproject#3220

Fix issue with zeros when reporting access analytics (ampproject#3206)

Fix the issues with post-download upgrade (ampproject#3192)

Fix the issues with post-download upgrade (ampproject#3192)

IE: resolve the matchMedia problem (ampproject#3112)

* IE: resolve the matchMedia problem

* linter

* Protect from both min-width and max-width errors

Fix getComputedStyle=null issue on Firefox (ampproject#3103)

* Fix getComputedStyle=null issue on Firefox

* fixes

Fix issue where observeIntersection was not returning the unlisten fu… (

ampproject#3060)

chore(package): update promise-pjs to version 1.1.1 (ampproject#3072)

Implement AMP-side click measurement. (ampproject#2969)

Introduces a redirect-avoidance mechanism that enables referrers to track a link invocation without an intermediate redirect by passing a URL to AMP via a fragment param. This change is experiment guarded.

Also introduces a small new binary for use on the referrer side (e.g. inside of an ad creative) that helps with constructing the respectives URLs and preconnects to AMP.

Primary implementation of ampproject#2934