support JS bridge for online SWF

[zwetan]

so we could

• read the analytics.js cookie and reuse it in the SWF
• get browser informations like document encoding, referrer, etc.

[zwetan]

the JS Bridge should be able

• gather information from the HTML page context, for ex: document encoding, document referer
• not duplicate what is already done in Flash (eg. we don't care to get the viewport size from the HTML context)
• purely optional, eg. it can fail without generating errors

[zwetan]

with that we should be able to read the analytics.js cookie
extract the Client ID from it and reusing in the Flash context

so a browsing session see HTML tracking and Flash tracking
coming from the same user (eg. the Client ID)

[zwetan]

see Linker (Cross-domain Tracking)

[zwetan]

we should also be able to get the document url query/hash
to gather campaign info

for ex:
www.as3lang.org/?utm_source=google&utm_medium=banner&utm_term=flash&utm_content=deadbeef&utm_campaign=Runtime%20of%20Death

[zwetan]

see Generate custom campaign parameters for your advertising URLs

see Campaign Measurement