Resolve XML parser used in tests.

We recently pivoted the default XML parser to write a new binary
XML schema, which requires all users to "resolve" to determine the
correct parser.

Bug: 176037390
Test: atest WmTests:DisplayWindowSettingsProviderTests
Change-Id: I2077821f6812a33ff92c97f481b38d01c4ef7ae0
1 file changed