Implement cross-thread MediaSource attachments #1470

Job	Run time
android-arm / initialize	44s
android-arm64 / initialize	45s
android-x86 / initialize	46s
android-arm / docker-build-image	2m 13s
android-arm / docker-unittest-image	0s
android-arm64 / docker-build-image	2m 48s
android-arm64 / docker-unittest-image	0s
android-x86 / docker-build-image	2m 3s
android-x86 / docker-unittest-image	0s
android-arm / arm_devel	18m 34s
android-arm / arm_debug	17m 37s
android-arm / arm_qa	10m 37s
android-arm / arm_gold	10m 18s
android-x86 / x86_devel	17m 23s
android-x86 / x86_debug	17m 51s
android-x86 / x86_qa	11m 13s
android-x86 / x86_gold	10m 32s
android-arm64 / arm64_devel	17m 41s
android-arm64 / arm64_debug	17m 47s
android-arm64 / arm64_qa	10m 10s
android-arm64 / arm64_gold	10m 37s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-x86 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
upload-release-artifacts	11s
	2h 59m 50s

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