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This adds an OWNERS file for this folder for consistency with other
Android code that supports Cast features.

Change-Id: I7da7aac04b56c493cf78be47afdfc2e47604682e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441528Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814296}