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This patch adds an integration test for the Android payment app finder
using the real parser and downloader instead of mocks.

This patch adds payment app manifest files in
components/test/data/payments/<hostname>.com/. Because the embedded test
server uses HTTP, but payment manifests must use HTTPS, a
URLSubstituteParser wraps the PaymentManifestParser to replace
https://<hostname>.com with the test server URLs, e.g.,
http://127.0.0.1:12345/components/test/data/payments/<hostname>.com.

Because integration tests should not depend on the state of locally
installed applications, a MockPackageManagerDelegate is used to simulate
installed native Android apps in memory.

Bug: 620173
Change-Id: I8184a84f9f9daa05b5cc8da6e343378b62333b1a
Reviewed-on: https://chromium-review.googlesource.com/571943
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488729}