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This patch adds a cross-platform way for Web Payment feature to query
the IS_READY_TO_PAY intent of an Android app. As a first step, only the
Android apps installed on the Android subsystem of Chrome OS are
supported.

Bug: 1061503
Change-Id: I3055874e96e046a233c5bb223c9e4422d7e8e966
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248427
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Liquan (Max) Gu <maxlg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797954}