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This patch adds the skeleton code for a payment app factory for Android
payment apps. The new factory is disabled by default, but can be enabled
via chrome://flags/#enable-web-payments-experimental-features drop-down
or --enable-features=CrossPlatformAndroidPaymentAppFactory command line
flag. When enabled, the new factory does not return any payment apps in
this patch.

Bug: 1061503
Change-Id: Iea19c68889be77d5083f86d2b9063db64de38cd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2299855
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Sahel Sharify <sahel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798471}