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This change creates a new class, BarcodeDetectorStatics, which owns the
connection to BarcodeDetectionProvider. This allows it to implement the
static methods on BarcodeDetector such as getSupportedFormats() without
needing to create an instance of BarcodeDetector.

This fixes an issue where getSupportedFormats() would reject when
BarcodeDetection is unimplemented even if a successful connection to
BarcodeDetectionProvider is made. It also avoids recreating the
provider connection for every new BarcodeDetector.

Bug: 983910
Change-Id: I7c7ea7df84f68bbed9b2bfc600852e4f4e5356cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1706893
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680560}