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Add ClearKey test. ClearKey is handled in renderer process. It should be
supported on all the cast builds.

Bug: internal b/119043784
Test: CQ
Change-Id: I736cb4a6e863d3d92a5c31ab259624b395f550d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2155246
Commit-Queue: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Sean Topping <seantopping@chromium.org>
Auto-Submit: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760214}