Max Wang 905c582497 Background image load api (#1007)
* fix SIMULATE_WEB_RESPONSE not imported #449

* Fix to make rangeMode update in right time

* remove uncessary assert

* add api to allow delegated calls in background.

* fix typo

* 1. Add class property to decide whether to send delegate callbacks on
main or background.
2. remove non-info api.

* Refactor.

* add ivar for class property.

* Donot use extra api.

* Refactor

* refactor

* revert to use let

* refactor

* make class property atomic.

* kick of new ci test.

* kick off new ci
2018-07-24 15:57:59 -07:00
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