DO NOT MERGE Add shader tests to known failures

These tests aren't ready to be released yet.

Change-Id: Iccc610fc3fe532c2ce99d114ffe4bd8187a8b69b
diff --git a/tests/expectations/knownfailures.txt b/tests/expectations/knownfailures.txt
index 834441b..770b85c 100644
--- a/tests/expectations/knownfailures.txt
+++ b/tests/expectations/knownfailures.txt
@@ -1,5 +1,13 @@
 [
   {
+    name: "android.opengl.cts.AttachShaderTest#test_glAttachedShaders_invalidshader",
+    bug: 6404341
+  },
+  {
+    name: "android.opengl.cts.AttachShaderTest#test_glAttachShaders_programobject_attach_fragshaderobject",
+    bug: 6292666
+  },
+  {
     name: "android.openglperf.cts.GlVboPerfTest#testVboWithVaryingIndexBufferNumbers",
     bug: 5898262
   },