Felipe Leme 24aae15218 Added a new AutofillCallback.EVENT_INPUT_UNAVAILABLE event.
This event is called when:

- After notifyViewEntered() when autofill is disabled.
- After service returns an "empty" FillResponse to FillCallback.onSuccess().

BUG: 36056207

Test: LoginActivityTest.testAutofillCallbackDisabled
Test: LoginActivityTest.testAutofillCallbackNoDatasets
Test: VirtualContainerActivityTest.testAutofillCallbackDisabled
Test: VirtualContainerActivityTest.testAutofillCallbackNoDatasets

Change-Id: I7b8636473f738bf600aa96b28c77827b2cc78815
2017-03-16 19:40:22 -07:00
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