[UMA] Add missing metric to actions.xml and histogram.xml

Some implemented user actions and histograms for TabGroup  does not show
up in the dashboard because of the misspelled name or is not included in
the actions.xml and histograms.xml file.

This CL adds/corrects the following metric name to actions.xml file:
  1. MobileNewTabOpenedTabStrip (action)
  2. MobileStackViewSwipeCloseTab.TabGridSheet
  3. MobileStackViewSwipeCloseTab.GridTabSwitcher
  4. MobileStackViewSwipeCloseTab.TabGridDialog

In addtion, it adds the following name to histogram.xml file:
  1. TabGroups.UserGroupCount

Change-Id: I96c954efcbeeb30bc50e4cf4545c26671e947293
Bug: 959358
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1628313
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Mei Liang <meiliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663304}
2 files changed