focus_mode: Add support for track thumbnails
The image is downloaded in native code using the focus mode traffic annotation. It is then encoded as a data URL and passed to the player. BUG=b:337064323 Change-Id: I31b286aea394217a8034a360047966728a41809e Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5609712 Reviewed-by:Richard Chui <richui@chromium.org> Commit-Queue: Richard Chui <richui@chromium.org> Reviewed-by:
Sean Kau <skau@chromium.org> Cr-Commit-Position: refs/heads/main@{#1312368}
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