Ignore whitespace only text events in BridgeXmlBlockParser

Those events for example happened when a closing tag is on a separate
line from the opening tag as in
<TextView
  android:height:...>
</TextView>
AAPT removes all those so that XmlBlock$Parser never encounters this
situation. This makes BridgeXmlBlockParser ignore those events to
produce the same result as XmlBlock$Parser in the end.

Bug: 150587499
Test: BridgeXmlBlockParserTest updated
Change-Id: I6d99c7660c2a0d3f867156ebf93db59f6952c641
(cherry picked from commit 5de62bb2552fdb219df6dea663cbf005974c6a38)
2 files changed