Chromecast: CmaMessageFilterHost SetCdm threading change.
* Revert change to do a multi-step thread-hopping destroy.
This was not a solid idea in the first place.
* Removes UI-thread member function from CmaMessageFilterHost
(SetCdmOnUiThread) and makes it static.
* Checks validity of MediaPipelineHost reference on CMA thread
before invoking MediaPipelineHost::SetCdm by maintaining an extra
map of MediaPipelineHost references exclusively on the CMA thread.
R=lcwu@chromium.org,servolk@chromium.org
BUG=internal b/20188230
Review URL: https://codereview.chromium.org/1080233003
Cr-Commit-Position: refs/heads/master@{#325949}
4 files changed
