Alexander Brusher 82ffcd8ee8 Update node fields fix (flutter/engine#16428)
* Modifies accessibility bridge to populate new node fields in semantics API.

* Adds additional UTs and fixes logic for breaking up updates for nodes with large values.

* Chaged tests to set node flags using bitwise-or instead of addition.

* Address bug in update size arithmetic.

* Fixes issue in TruncatesLargeValue unit test causing unexpected deletes.

* Fixes expected number of updates in BatchesLargeMessages unit test to reflect expected values now that node states are populated.
2020-02-07 13:24:36 -08:00
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