Camera2: Add a test for holding images for a while

Add a test to simulate the case where the app takes a long time
to process the output images and verify the result exposure time
and sensitivity are correct.

Mark the tests as new failures because it fails on current
devices.

Bug: 22861512
Change-Id: I4cc63c50fa659eba1b5e4a1d88a911ce896a3f03
diff --git a/tests/expectations/knownfailures.txt b/tests/expectations/knownfailures.txt
index cf4772f..591045a 100644
--- a/tests/expectations/knownfailures.txt
+++ b/tests/expectations/knownfailures.txt
@@ -193,6 +193,14 @@
   bug: 22092756
 },
 {
+  description: "The new long processing test is not yet passing on all devices",
+  names: [
+    "android.hardware.camera2.cts.ImageReaderTest#testLongProcessingRepeatingRaw",
+    "android.hardware.camera2.cts.ImageReaderTest#testLongProcessingRepeatingFlexibleYuv"
+  ],
+  bug: 22861512
+},
+{
   description: "known failures",
   names: [
     "android.hardware.cts.SensorBatchingTests#testAccelerometer_50hz_batching",