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This is the first step towards consolidating OS integration logic to
OsIntegrationManager. This patch adds just enough
functionality to replace the OS logic in AppLaunchHandler.

Bug: 1087219
Change-Id: I632327b9c7c86683e2b408ea361ee183aed13d86
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2251198Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Phillis Tang <phillis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780109}