Add Precache.CacheStatus.NonPrefetch.FromPrecache.

Add Precache.CacheStatus.NonPrefetch.FromPrecache.

This UMA is like Precache.CacheStatus.NonPrefetch, but only for requests
where the URL matches an unused entry in the precache_urls table -- that
is, first requests for URLs retrieved as part of prefetching. Misses
would be reported by this metric as a result of expiration or eviction.

Changed PrecacheURLTable::Is*URL*() methods with varying WHERE clauses to
PrecacheURLTable::GetURLInfo() and a PrecacheURLInfo struct containing the
SELECTed columns. This allows us to report this metric not just for first
requests for precached URLs (i.e. where is_precached = 1), but for all such
requests. This should cause the metrics sampled to be weighted similarly to
HttpCache.Pattern.

BUG=650773
Review-Url: https://codereview.chromium.org/2364873004
Cr-Commit-Position: refs/heads/master@{#423892}
(cherry picked from commit 25783a2fecb69d613b1f3cfa9ea9e347b87887de)

Committed: https://chromium.googlesource.com/chromium/src/+/f3426a9beee6d0bdf664ece23c26e3d452c96123

[twifkak, 2016-10-13 22:33:26]

Description was changed from

==========
Add Precache.CacheStatus.NonPrefetch.FromPrecache.

This UMA is like Precache.CacheStatus.NonPrefetch, but only for requests
where the URL matches an unused entry in the precache_urls table -- that
is, first requests for URLs retrieved as part of prefetching. Misses
would be reported by this metric as a result of expiration or eviction.

Changed PrecacheURLTable::Is*URL*() methods with varying WHERE clauses to
PrecacheURLTable::GetURLInfo() and a PrecacheURLInfo struct containing the
SELECTed columns. This allows us to report this metric not just for first
requests for precached URLs (i.e. where is_precached = 1), but for all such
requests. This should cause the metrics sampled to be weighted similarly to
HttpCache.Pattern.

BUG=650773

Review-Url: https://codereview.chromium.org/2364873004
Cr-Commit-Position: refs/heads/master@{#423892}
(cherry picked from commit 25783a2fecb69d613b1f3cfa9ea9e347b87887de)
==========

to

==========
Add Precache.CacheStatus.NonPrefetch.FromPrecache.

This UMA is like Precache.CacheStatus.NonPrefetch, but only for requests
where the URL matches an unused entry in the precache_urls table -- that
is, first requests for URLs retrieved as part of prefetching. Misses
would be reported by this metric as a result of expiration or eviction.

Changed PrecacheURLTable::Is*URL*() methods with varying WHERE clauses to
PrecacheURLTable::GetURLInfo() and a PrecacheURLInfo struct containing the
SELECTed columns. This allows us to report this metric not just for first
requests for precached URLs (i.e. where is_precached = 1), but for all such
requests. This should cause the metrics sampled to be weighted similarly to
HttpCache.Pattern.

BUG=650773

Review-Url: https://codereview.chromium.org/2364873004
Cr-Commit-Position: refs/heads/master@{#423892}
(cherry picked from commit 25783a2fecb69d613b1f3cfa9ea9e347b87887de)

Committed:
https://chromium.googlesource.com/chromium/src/+/f3426a9beee6d0bdf664ece23c26...
==========

[twifkak, 2016-10-13 22:33:27]

Committed patchset #1 (id:1) manually as
f3426a9beee6d0bdf664ece23c26e3d452c96123.