Add keywords to Slices

Attach the keywords used for Settings search to Slices.
Their primary use is helping match synonyms for presenters
which display slices without explicit Uri requests, like a launcher.

This changes:
- Updates database scheme
- Adds to SliceData object
- Grab keywords in the SliceDataConverter
- Set keywords on all slices

Test: robotests
Change-Id: I16c40d2380ffddaf0a87fb1b9cd58e95573b308f
Fixes: 78306195

src/com/android/settings/slices/SlicesIndexer.java

@@ -105,6 +105,7 @@ class SlicesIndexer implements Runnable {
             values.put(IndexColumns.TITLE, dataRow.getTitle());
             values.put(IndexColumns.SUMMARY, dataRow.getSummary());
             values.put(IndexColumns.SCREENTITLE, dataRow.getScreenTitle().toString());
+            values.put(IndexColumns.KEYWORDS, dataRow.getKeywords());
             values.put(IndexColumns.ICON_RESOURCE, dataRow.getIconResource());
             values.put(IndexColumns.FRAGMENT, dataRow.getFragmentClassName());
             values.put(IndexColumns.CONTROLLER, dataRow.getPreferenceController());