[Chromecast] Change canPlayType() for individual apps

Each WebApplication sends the supported audio codecs to its
CastContentRendererClient using Mojo.

Bug: internal b/73180315
Test: cast to Chromecast
Change-Id: I405f2765ede611ed81488f78bca7bb9b2734f769
Reviewed-on: https://chromium-review.googlesource.com/910711
Commit-Queue: James West <[email protected]>
Reviewed-by: Daniel Cheng <[email protected]>
Reviewed-by: Stephen Lanham <[email protected]>
Reviewed-by: Luke Halliwell <[email protected]>
Reviewed-by: Kenneth MacKay <[email protected]>
Cr-Commit-Position: refs/heads/master@{#537166}
16 files changed