SampleVideoEncoder: To encode AVC/HEVC stream with B-frames enabled

It uses MediaRecorder APIs to record B-frames enabled video from camera2
input and MediaCodec APIs to encode reference test vector using input surface.

Test: adb shell am start -n "com.android.media.samplevideoencoder/com.\
      android.media.samplevideoencoder.MainActivity"

Bug: 176060167

Change-Id: If0bae193c49a923d642a9bbc4aa0bb0b49670264
diff --git a/media/tests/SampleVideoEncoder/settings.gradle b/media/tests/SampleVideoEncoder/settings.gradle
new file mode 100644
index 0000000..4d3c3a5
--- /dev/null
+++ b/media/tests/SampleVideoEncoder/settings.gradle
@@ -0,0 +1,2 @@
+include ':app'
+rootProject.name = "SampleVideoEncoder"
\ No newline at end of file