Ok, the title might be misleading, but as of the last few days we are <5% orange for android unittests on mozilla-central. The reason this was done is we have hidden J1 and R2 from the results. We are tracking these in the weekly mobile automation meetings, and will continue to do so until those tests are live again.
For more data on specifics to our test failure distribution, please check out this spreadsheet and look at the different sheets. We have been working for the last few weeks trying to reproduce these failures and the only concrete reproducible bug we could come up with was bug 691073.
We will continue to fix a few oranges that we see on the other tests as well as reduce the number of red/purple.