Implement cross-thread MediaSource attachments #1669

Job	Run time
android-arm / initialize	39s
android-arm64 / initialize	32s
android-x86 / initialize	34s
android-arm64 / docker-build-image	3m 16s
android-arm64 / docker-unittest-image	0s
android-x86 / docker-build-image	3m 7s
android-x86 / docker-unittest-image	0s
android-arm / docker-build-image	3m 12s
android-arm / docker-unittest-image	0s
android-x86 / x86_devel	20m 6s
android-x86 / x86_debug	18m 3s
android-x86 / x86_qa	11m 10s
android-x86 / x86_gold	11m 9s
android-arm64 / arm64_devel	18m 19s
android-arm64 / arm64_debug	18m 7s
android-arm64 / arm64_qa	11m 20s
android-arm64 / arm64_gold	11m 33s
android-arm / arm_devel	18m 36s
android-arm / arm_debug	18m 31s
android-arm / arm_qa	11m 5s
android-arm / arm_gold	11m 54s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-x86 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
upload-release-artifacts	20s
	3h 11m 33s

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