DO NOT MERGE Add UiAutomationTest#testWindowContentFrameStats to knownfailures

The test is not able to pass in a reliable manner without the patch
75b55d0846159543aafc1b7420915497fce9b3f1 which is only available
in Android 5.1 (Lollipop MR1)

Bug: 18039218
Change-Id: I50ba892f893b32243b8026d1ec9f1aaa6a7bda92
1 file changed