add private properties of base-element to amp.extern (ampproject#3628)

Do not obfuscated uppercase names. (ampproject#3590)

This is too aggressive while we don't have proper externs.

Fixes ampproject#3588 although no Criteo ad is showing.

fix(csi): wait until messaging channel is established before flushing (…

…ampproject#3580)

fix shorthand lint error (ampproject#3532)

chore(package): update jsdom to version 9.2.1 (ampproject#3374)

Reset border-top for iOS in lightbox mode (ampproject#3407)

Fixing hidden infinite loop in the build pending and attach cycle (am…

…pproject#3355)

* Only do the build resource loop if we are not already in one.

* Add tests

* outside the loop set flag.

* Protect with try-catch.

* cleanup

* build new resource test.

* Only add to pending if it's not built.

* Add comments.

Fix infinite loop :( (ampproject#3310)

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