Add tests for TreeHugger Presubmit.

codec, D-R-M
we strive to ship robust code
pre-submit more tests

Bug: 155319496

Test: atest
Change-Id: I271c32436099445add2eb0f54adbff9c884c2dcd

apex/TEST_MAPPING

@@ -3,5 +3,30 @@
     {
       "path": "system/apex/tests"
     }
+  ],
+  "presubmit": [
+    // The following tests validate codec and drm path.
+    {
+      "name": "GtsMediaTestCases",
+      "options" : [
+        {
+          "include-annotation": "android.platform.test.annotations.Presubmit"
+        },
+        {
+          "include-filter": "com.google.android.media.gts.WidevineGenericOpsTests"
+        }
+      ]
+    },
+    {
+      "name": "GtsExoPlayerTestCases",
+      "options" : [
+        {
+          "include-annotation": "android.platform.test.annotations.SocPresubmit"
+        },
+        {
+          "include-filter": "com.google.android.exoplayer.gts.DashTest#testWidevine23FpsH264Fixed"
+        }
+      ]
+    }
   ]
 }