Summary:
This adds blurRadius support for <Image>, similar to iOS.
The heavy-lifting was done by lambdapioneer in the stack of diffs ending with
D3924013, we're just patching this in.
Two notes: we might need to apply two postprocessors going forward, will tackle
that in a separate diff, so we can ship this asap.
However, we need a new version of fresco to be released in order
to ship this.
Reviewed By: lexs
Differential Revision: D3936438
fbshipit-source-id: 353bf1f1120ebd5f4f8266c5a20188b41478a741
0b348095b6