dfa9498360
Naively embedded platform views on Android were never able to receive keyboard input, because they were never focusable. So far we've worked around the limiation by hooking into InputMethodManager and proxying the InputConnection from a focused window over to the embeded view. Android Q changed InputMethodManager to be instanced per display instead of a singleton. Because of this our proxy hook was never being called, since it was being set up on a different instance of IMM than was being used in the virtual display. Update `SingleViewPresentation` to store the IMM from the focused window and return it whenever there are any calls to `INPUT_METHOD_SERVICE`. This hooks our proxy back into place for the embedded view in the virtual display. This restores the functionality of our workaround from previous versions. Unfortunately there's still a lot of noisy error logs from IMM here. It can tell that the IMM has a different displayId than what it's expecting from the window. This also updates the unit tests to support SDK=27. SDK 16 doesn't have DisplayManager, so there were NPEs attempting to instantiate the class under test.
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