[media] Turn SbPlayerPrivate into an interface #1380

Job	Run time
android-arm64 / initialize	45s
android-arm / initialize	42s
android-x86 / initialize	43s
android-arm / docker-build-image	2m 6s
android-arm / docker-unittest-image	0s
android-x86 / docker-build-image	2m 23s
android-x86 / docker-unittest-image	0s
android-arm64 / docker-build-image	2m 6s
android-arm64 / docker-unittest-image	0s
android-arm / arm_devel	5m 0s
android-arm / arm_debug	5m 21s
android-arm / arm_qa	5m 0s
android-arm / arm_gold	5m 0s
android-arm64 / arm64_devel	3m 43s
android-arm64 / arm64_debug	3m 47s
android-arm64 / arm64_qa	3m 41s
android-arm64 / arm64_gold	3m 44s
android-x86 / x86_devel	1s
android-x86 / x86_debug	1s
android-x86 / x86_qa	1s
android-x86 / x86_gold	1s
android-x86 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	1s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	1s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	1s
android-arm / ${{ matrix.name }}_on_device_${{ matrix.shard }}	1s
android-arm64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	1s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	1s
upload-release-artifacts	0s
	44m 11s

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