StagefrightTest: add testStagefright_bug_21443020.

Bug: 37225828
Change-Id: Iabedd7d465d61fbd54cbd820d36b5fe8657615a8
diff --git a/tests/tests/security/res/raw/bug_21443020_webm.mp4 b/tests/tests/security/res/raw/bug_21443020_webm.mp4
new file mode 100644
index 0000000..edb761a
--- /dev/null
+++ b/tests/tests/security/res/raw/bug_21443020_webm.mp4
Binary files differ
diff --git a/tests/tests/security/src/android/security/cts/StagefrightTest.java b/tests/tests/security/src/android/security/cts/StagefrightTest.java
index b131a7f..139a124 100644
--- a/tests/tests/security/src/android/security/cts/StagefrightTest.java
+++ b/tests/tests/security/src/android/security/cts/StagefrightTest.java
@@ -71,6 +71,11 @@
      before any existing test methods
      ***********************************************************/
 
+    @SecurityTest
+    public void testStagefright_bug_21443020() throws Exception {
+        doStagefrightTest(R.raw.bug_21443020_webm);
+    }
+
     public void testStagefright_bug_34360591() throws Exception {
         doStagefrightTest(R.raw.bug_34360591);
     }