added back adopthost test removed video encoding test.  

bug: 23827982

Change-Id: I6edce0ea4678a13b4906b1e73657125135db3e51
diff --git a/tests/expectations/knownfailures.txt b/tests/expectations/knownfailures.txt
index a31851b..4c599c0 100644
--- a/tests/expectations/knownfailures.txt
+++ b/tests/expectations/knownfailures.txt
@@ -339,14 +339,12 @@
    bug: 23979591
 },
 {
-   description: "Adoptable host tests fails.",
+   description: "Video encoding tests are timing out.",
    names: [
-      "com.android.cts.appsecurity.AdoptableHostTest#testApps",
-      "com.android.cts.appsecurity.AdoptableHostTest#testEjected",
-      "com.android.cts.appsecurity.AdoptableHostTest#testPackageInstaller",
-      "com.android.cts.appsecurity.AdoptableHostTest#testPrimaryStorage"
-    ],
-    bug: 23040468
+     "android.media.cts.VideoEncoderTest#testGoogH264FlexArbitraryW",
+     "android.media.cts.VideoEncoderTest#testGoogH264SurfArbitraryW"
+   ],
+   bug: 23827982
 },
 {
   description: "tests not yet ready",