Split ash dropped frame UMA into 3

Split ash dropped frame UMA into 3 based on session state. So that
dropped frames at different login state could be looked at separately
and it is easier to skip known problems around post login.

Bug: 1292168
Change-Id: I882423b30e98faaf6e147bd85dcd1fbfa96a4b10
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3622255
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Behdad Bakhshinategh <behdadb@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/main@{#999951}