Consolidate inline dropdown and callback conversion

android.autofillservice.cts (7 Tests)
[1/7] android.autofillservice.cts.inline.InlineLoginMixedCredentialActivityTest#testAutofill_selectCredentialThenNonCredential: PASSED (4.575s)
[2/7] android.autofillservice.cts.inline.InlineLoginMixedCredentialActivityTest#getCredentialProviderServices_returnsAllProviders: PASSED (1.083s)
[3/7] android.autofillservice.cts.inline.InlineLoginMixedCredentialActivityTest#testAutofill_startAndEndWithNonCredential: PASSED (3.669s)
[4/7] android.autofillservice.cts.inline.InlineLoginMixedCredentialActivityTest#testAutofill_startAndEndWithCredential: PASSED (3.542s)
[5/7] android.autofillservice.cts.inline.InlineLoginMixedCredentialActivityTest#testAutofill_selectNonCredentialThenCredential: PASSED (3.166s)
[6/7] android.autofillservice.cts.inline.InlineLoginMixedCredentialActivityTest#testAutofill_selectNonCredentialView: PASSED (2.211s)
[7/7] android.autofillservice.cts.inline.InlineLoginMixedCredentialActivityTest#testAutofill_selectCredentialView: PASSED (2.288s)

Summary (Test executed with 1 devices.)
-------
arm64-v8a CtsAutoFillServiceTestCases: Passed: 7, Failed: 0, Ignored: 0, Assumption Failed: 0

All tests passed!
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Test: Built & deployed locally
Bug: 302000646

Change-Id: I9c6ced4fa85cecf34fe4c20d1580013bfade96bf