Capture histograms recording SearchActivity usage.

The newly added histograms capture the origin of an intent, requested
search type, and whether the intent was used to instantiate or update
existing activity.

Bug: 323246479
Change-Id: I8b7ea492e4c872af37e8df9f481dd320d79dac99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5527235
Commit-Queue: Tomasz Wiszkowski <ender@google.com>
Reviewed-by: Patrick Noland <pnoland@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1298341}