Added some Tabs.* and WindowManager.* histograms to be visible in UMA dashboards.
These histograms were defined in the internal histograms.xml but were recorded in the open source of chromium. This CL moves them to the public histograms.xml file so that they are visible in the UMA dashboards.
List of histograms added:
- Tabs.TabCountActiveWindow
- Tabs.TabCountPerLoad
- Tabs.TabCountPerWindow
- WindowManager.AppWindowCountPerLoad
- WindowManager.PanelWindowCountPerLoad
- WindowManager.PopUpWindowCountPerLoad
- WindowManager.TabbedWindowCountPerLoad
BUG=475549
Review URL: https://codereview.chromium.org/
1080573002
Cr-Commit-Position: refs/heads/master@{#324866}