Bug 1912929 [wpt PR 47585] - [MediaCapture Extensions] Fix background segmentation mask constraints, a=testonly

Automatic update from web-platform-tests
[MediaCapture Extensions] Fix background segmentation mask constraints

This CL fixes background segmentation mask constraints to be passed
to the imagecapture module and adds a web platform test to test
background segmentation mask constraints and settings.

Background segmentation mask feature is behind a flag:
chrome --enable-blink-features=MediaCaptureCameraControls

Intent to Prototype: https://groups.google.com/a/chromium.org/g/blink-dev/c/nWEqxi83rus

Spec: w3c/mediacapture-extensions#142

Explainer: https://github.com/riju/backgroundBlur/blob/main/explainer.md#background-segmentation-mask-api

Bug: 349939554
Change-Id: I1c11bd8919272147ed28f699a38dd8922cefc4c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5783519
Reviewed-by: Rijubrata Bhaumik <rijubrata.bhaumikintel.com>
Commit-Queue: Eero Hakkinen <eero.hakkinenintel.com>
Reviewed-by: Guido Urdaneta <guidouchromium.org>
Cr-Commit-Position: refs/heads/main{#1341202}

--

wpt-commits: 732899be1aa3e1efcb01cab15852eb4c05bfe9b5
wpt-pr: 47585

UltraBlame original commit: 2c630b9a9b00e52c53c4a4871af68a122133d332

Author: marco-c

testing/web-platform/tests/mediacapture-extensions/GUM-backgroundBlur.https.html

@@ -15,6 +15,9 @@
 Test
 background
 blur
+and
+segmentation
+mask
 support
 <
 /
@@ -79,6 +82,9 @@
 checks
 background
 blur
+and
+segmentation
+mask
 support
 .
 <
@@ -142,6 +148,9 @@
 backgroundBlur
 :
 true
+backgroundSegmentationMask
+:
+true
 }
 ;
 Object