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Those interfaces are used for organizing Cast native windows to work
with an external window manager via the interface CastWindowEmbedder
primarily through pre-defined events and requests.

The unittest is not exhaustive and more test cases will be added in
follow-up CLs.

Bug: Internal b/173251340
Test: cast_content_window_embedded_unittest
Change-Id: I9385cfb0bd2af64cc364f74f5c1b86b88d4432ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2539668Reviewed-by: Shawn Gallea <sagallea@google.com>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Commit-Queue: Jiawei Li <lijiawei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843204}