Exposing CacheEntryStatus (former TransactionPattern) via UrlRequest

Exposing CacheEntryStatus (former TransactionPattern) via UrlRequest

This will allow to know how the UrlRequest affected the cache.

Currently, it was possible to retrieve:
                           cache used = was_cached && !network_accessed
                      cache validated = was_cached && network_accessed
  not used/updated/cantconditionalize = !was_cached

This change allows to tell apart the not used/updated/cantconditionalize
sub-categories.

This change has the added benefit that HttpCacheTransaction::RecordHistograms
could be refactorized out of that class and moved to upper layers.

BUG=615434
Review-Url: https://codereview.chromium.org/2113603003
Cr-Commit-Position: refs/heads/master@{#407971}
(cherry picked from commit 19ff6f1bd9d1ea24e3104d0cbec6352640545d8c)

Committed: https://chromium.googlesource.com/chromium/src/+/8939e8c9152b2afd54bfbd8400af6cc61706d6c1

[twifkak, 2016-08-01 19:35:31]

Description was changed from

==========
Exposing CacheEntryStatus (former TransactionPattern) via UrlRequest

This will allow to know how the UrlRequest affected the cache.

Currently, it was possible to retrieve:
                           cache used = was_cached && !network_accessed
                      cache validated = was_cached && network_accessed
  not used/updated/cantconditionalize = !was_cached

This change allows to tell apart the not used/updated/cantconditionalize
sub-categories.

This change has the added benefit that HttpCacheTransaction::RecordHistograms
could be refactorized out of that class and moved to upper layers.

BUG=615434

Review-Url: https://codereview.chromium.org/2113603003
Cr-Commit-Position: refs/heads/master@{#407971}
(cherry picked from commit 19ff6f1bd9d1ea24e3104d0cbec6352640545d8c)
==========

to

==========
Exposing CacheEntryStatus (former TransactionPattern) via UrlRequest

This will allow to know how the UrlRequest affected the cache.

Currently, it was possible to retrieve:
                           cache used = was_cached && !network_accessed
                      cache validated = was_cached && network_accessed
  not used/updated/cantconditionalize = !was_cached

This change allows to tell apart the not used/updated/cantconditionalize
sub-categories.

This change has the added benefit that HttpCacheTransaction::RecordHistograms
could be refactorized out of that class and moved to upper layers.

BUG=615434

Review-Url: https://codereview.chromium.org/2113603003
Cr-Commit-Position: refs/heads/master@{#407971}
(cherry picked from commit 19ff6f1bd9d1ea24e3104d0cbec6352640545d8c)

Committed:
https://chromium.googlesource.com/chromium/src/+/8939e8c9152b2afd54bfbd8400af...
==========

[twifkak, 2016-08-01 19:35:32]

Committed patchset #1 (id:1) manually as
8939e8c9152b2afd54bfbd8400af6cc61706d6c1.