Benchmark: Add JNI test for Extractor and Muxer

Test: adb shell am instrument -w -r -e debug false -e class\
      'com.android.media.benchmark.tests.ExtractorTest#sampleExtractNativeTest' \
      com.android.media.benchmark/androidx.test.runner.AndroidJUnitRunner

Test: adb shell am instrument -w -r -e debug false -e class\
      'com.android.media.benchmark.tests.MuxerTest#sampleMuxerNativeTest' \
      com.android.media.benchmark/androidx.test.runner.AndroidJUnitRunner

Bug: 140051680

Change-Id: I5c58326f7eef725c12f613b89c75b2987f616a41
7 files changed