Integrate autofill session lifecycle with URL bar changes when on compat mode.

The contents of a browser URL bar is typically changed for 2 reasons:

1.User entered a new URL.
2.Form was submitted and the URL changed.

On scenario #1, the current session should be canceled, while on #2 it should be
committed. Scenario #2 is already handled when the service sets a SaveInfo, so
this CL handles the other cases:

1.Focus on URL bar is ignored so it does not trigger a new partition.
2.If URL bar changed and service didn't set a SaveInfo, the session is canceled.

Fixes: 76027553

Test: manual test with Chrome
Test: new tests on VirtualContainerActivityCompatModeTest:
      testFocusOnUrlBarIsIgnored()
      testUrlBarChangeIgnoredWhenServiceCanSave()
      testUrlBarChangeCancelsSessionWhenServiceCannotSave
      testUrlBarChangeCancelsSessionWhenServiceReturnsNullResponse
Test: atest CtsAutoFillServiceTestCases

Change-Id: I19d2aa4c8b25def0d5eca1c59cfdc2ffe33dd388