transcoding: add uid state based scheduling policy

bug: 145233472
bug: 154734285

test: unit tests

Change-Id: I9e8038252c2be834eb4e2fb2945396572d37b036
diff --git a/media/libmediatranscoding/tests/Android.bp b/media/libmediatranscoding/tests/Android.bp
index 1017d29..b54022a 100644
--- a/media/libmediatranscoding/tests/Android.bp
+++ b/media/libmediatranscoding/tests/Android.bp
@@ -37,6 +37,9 @@
     srcs: ["TranscodingClientManager_tests.cpp"],
 }
 
+//
+// TranscodingJobScheduler unit test
+//
 cc_test {
     name: "TranscodingJobScheduler_tests",
     defaults: ["libmediatranscoding_test_defaults"],