Log UpdateJumpList() and CreateIconFiles() execution time to UMA
The separation of JumpListIcons delete tasks and update tasks as in
crrev.com/2807883002 indicates the update task (i.e., RunUpdateJumpList
method) is now the major contributor of the overall long execution time.
So it's time to investigate the subtasks in RunUpdateJumpList().
The count of the new icon files that will be created per update is also
logged to UMA.
BUG=40407, 179576
Review-Url: https://codereview.chromium.org/2811393002
Cr-Commit-Position: refs/heads/master@{#464510}
2 files changed
