Capture existing tests into TEST_MAPPING

Some tests are disabled due to infrastructure limitations.
Some existing tests do not pass.

Bug: 144649738
Test: atest
Test: atest -- --enable-module-dynamic-download=true
Change-Id: I32b4233df0f635e9d4ad738b61a5138d9b370f0a
diff --git a/media/extractors/TEST_MAPPING b/media/extractors/TEST_MAPPING
index 5c90a70..40bf273 100644
--- a/media/extractors/TEST_MAPPING
+++ b/media/extractors/TEST_MAPPING
@@ -1,7 +1,7 @@
 // frameworks/av/media/extractors
 {
   "presubmit": [
-    // b/148094059: unit tests not allowed to download content
+    // TODO(b/148094059): unit tests not allowed to download content
     //{ "name": "ExtractorUnitTest" }
   ]
 }