[Android] Extend Android.PackageStats.* histogram timelines.

The following histograms:
- Android.PackageStats.CacheSize
- Android.PackageStats.DataSize
- Android.PackageStats.CodeSize
were added to be able to keep track of various sizes of the package
Chrome is installed under. Given the focus on binary size and other
size-related issues, these histograms continue to provide real value
and are poised to becoming even more important shortly, therefore
extending their lifetime ~1 year for now.

Also, adding another owner, so there are more people to contact in the
future.

Bug: 975303
Change-Id: Ic9de7d73fd0a2b266f063ae83cce55e9fca3fbba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1663397
Auto-Submit: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670242}
1 file changed