Detect XR usage#1379

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avaer wants to merge 5 commits intomasterfrom

Commits on Aug 6, 2019

Track xr mode requested in global context
Avaer Kazmer
committed
Post xr mode detection from window to parent
Avaer Kazmer
committed
Add window vm on xr mode event tracking
Avaer Kazmer
committed
Add HTMLIframeElement xrmode event capture and emit
Avaer Kazmer
committed
Make Document.js HTML initialization more defensive
Avaer Kazmer
committed