[webnfc] Do not support multiple scans on the same reader. #24587
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We added support for multiple scan invocations on the same Reader in
this CL https://chromium-review.googlesource.com/c/chromium/src/+/2145263
Since Origin Trials feedback was to remove Filtering,
spec : w3c/web-nfc#565
WIP CL : https://chromium-review.googlesource.com/c/chromium/src/+/2225770/
we tried to reason if in a world without filtering, multiple scans on
the same Reader is needed at all. The present thinking is to simply
reject scan promise when there's already an ongoing scan.
Spec discussions: w3c/web-nfc#592
Bug: 520391
Change-Id: Ic50873ddc30351cec6656ac7b030394dc9fa18ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2297559
Commit-Queue: Rijubrata Bhaumik <rijubrata.bhaumik@intel.com>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790438}