Add unit test for MatroskaExtractor full Block

The existing sample uses SimpleBlock

PiperOrigin-RevId: 284195590

library/core/src/test/assets/mkv/full_blocks.mkv.0.dump

@@ -0,0 +1,43 @@
+seekMap:
+  isSeekable = true
+  duration = 8901000
+  getPosition(0) = [[timeUs=0, position=5401]]
+numberOfTracks = 1
+track 1:
+  format:
+    bitrate = -1
+    id = 1
+    containerMimeType = null
+    sampleMimeType = application/x-subrip
+    maxInputSize = -1
+    width = -1
+    height = -1
+    frameRate = -1.0
+    rotationDegrees = 0
+    pixelWidthHeightRatio = 1.0
+    channelCount = -1
+    sampleRate = -1
+    pcmEncoding = -1
+    encoderDelay = 0
+    encoderPadding = 0
+    subsampleOffsetUs = 9223372036854775807
+    selectionFlags = 1
+    language = und
+    drmInitData = -
+    metadata = null
+    initializationData:
+  total output bytes = 213
+  sample count = 3
+  sample 0:
+    time = 0
+    flags = 1
+    data = length 59, hash A0217393
+  sample 1:
+    time = 2345000
+    flags = 1
+    data = length 95, hash 4904F2
+  sample 2:
+    time = 4567000
+    flags = 1
+    data = length 59, hash EFAB6D8A
+tracksEnded = true

library/core/src/test/assets/mkv/full_blocks.mkv.1.dump

@@ -0,0 +1,43 @@
+seekMap:
+  isSeekable = true
+  duration = 8901000
+  getPosition(0) = [[timeUs=0, position=5401]]
+numberOfTracks = 1
+track 1:
+  format:
+    bitrate = -1
+    id = 1
+    containerMimeType = null
+    sampleMimeType = application/x-subrip
+    maxInputSize = -1
+    width = -1
+    height = -1
+    frameRate = -1.0
+    rotationDegrees = 0
+    pixelWidthHeightRatio = 1.0
+    channelCount = -1
+    sampleRate = -1
+    pcmEncoding = -1
+    encoderDelay = 0
+    encoderPadding = 0
+    subsampleOffsetUs = 9223372036854775807
+    selectionFlags = 1
+    language = und
+    drmInitData = -
+    metadata = null
+    initializationData:
+  total output bytes = 213
+  sample count = 3
+  sample 0:
+    time = 0
+    flags = 1
+    data = length 59, hash A0217393
+  sample 1:
+    time = 2345000
+    flags = 1
+    data = length 95, hash 4904F2
+  sample 2:
+    time = 4567000
+    flags = 1
+    data = length 59, hash EFAB6D8A
+tracksEnded = true

library/core/src/test/assets/mkv/full_blocks.mkv.2.dump

@@ -0,0 +1,43 @@
+seekMap:
+  isSeekable = true
+  duration = 8901000
+  getPosition(0) = [[timeUs=0, position=5401]]
+numberOfTracks = 1
+track 1:
+  format:
+    bitrate = -1
+    id = 1
+    containerMimeType = null
+    sampleMimeType = application/x-subrip
+    maxInputSize = -1
+    width = -1
+    height = -1
+    frameRate = -1.0
+    rotationDegrees = 0
+    pixelWidthHeightRatio = 1.0
+    channelCount = -1
+    sampleRate = -1
+    pcmEncoding = -1
+    encoderDelay = 0
+    encoderPadding = 0
+    subsampleOffsetUs = 9223372036854775807
+    selectionFlags = 1
+    language = und
+    drmInitData = -
+    metadata = null
+    initializationData:
+  total output bytes = 213
+  sample count = 3
+  sample 0:
+    time = 0
+    flags = 1
+    data = length 59, hash A0217393
+  sample 1:
+    time = 2345000
+    flags = 1
+    data = length 95, hash 4904F2
+  sample 2:
+    time = 4567000
+    flags = 1
+    data = length 59, hash EFAB6D8A
+tracksEnded = true

library/core/src/test/assets/mkv/full_blocks.mkv.3.dump

@@ -0,0 +1,43 @@
+seekMap:
+  isSeekable = true
+  duration = 8901000
+  getPosition(0) = [[timeUs=0, position=5401]]
+numberOfTracks = 1
+track 1:
+  format:
+    bitrate = -1
+    id = 1
+    containerMimeType = null
+    sampleMimeType = application/x-subrip
+    maxInputSize = -1
+    width = -1
+    height = -1
+    frameRate = -1.0
+    rotationDegrees = 0
+    pixelWidthHeightRatio = 1.0
+    channelCount = -1
+    sampleRate = -1
+    pcmEncoding = -1
+    encoderDelay = 0
+    encoderPadding = 0
+    subsampleOffsetUs = 9223372036854775807
+    selectionFlags = 1
+    language = und
+    drmInitData = -
+    metadata = null
+    initializationData:
+  total output bytes = 213
+  sample count = 3
+  sample 0:
+    time = 0
+    flags = 1
+    data = length 59, hash A0217393
+  sample 1:
+    time = 2345000
+    flags = 1
+    data = length 95, hash 4904F2
+  sample 2:
+    time = 4567000
+    flags = 1
+    data = length 59, hash EFAB6D8A
+tracksEnded = true

library/core/src/test/java/com/google/android/exoplayer2/extractor/mkv/MatroskaExtractorTest.java

@@ -29,6 +29,11 @@ public final class MatroskaExtractorTest {
     ExtractorAsserts.assertBehavior(MatroskaExtractor::new, "mkv/sample.mkv");
   }
 
+  @Test
+  public void testMkvFullBlocksSample() throws Exception {
+    ExtractorAsserts.assertBehavior(MatroskaExtractor::new, "mkv/full_blocks.mkv");
+  }
+
   @Test
   public void testWebmSubsampleEncryption() throws Exception {
     ExtractorAsserts.assertBehavior(