[CacheStorage] Don't call GetUsageAndQuota from a scheduled operation

[CacheStorage] Don't call GetUsageAndQuota from a scheduled operation

Merge into branch 2704

Scheduled operations run sequentially. GetUsageAndQuota() can sometimes create
a new Size() scheduled operation, so calling it while in a scheduled operation
can result in a hung CacheStorage. This CL moves the calls to GetUsageAndQuota
to just before the operations are scheduled. This means that the size estimate
is less accurate, as it's determined potentially well before the operation runs.

BUG=620713
Review-Url: https://codereview.chromium.org/2085583002
Cr-Commit-Position: refs/heads/master@{#401001}
(cherry picked from commit 36dc82c2b7539b33b63cb6f967feae265625d178)

Committed: https://chromium.googlesource.com/chromium/src/+/64d27590ccffe40abab3e9560bd886f3624eff23

[jkarlin, 2016-07-01 13:20:56]

Description was changed from

==========
[CacheStorage] Don't call GetUsageAndQuota from a scheduled operation

Merge into branch 2704

Scheduled operations run sequentially. GetUsageAndQuota() can sometimes create
a new Size() scheduled operation, so calling it while in a scheduled operation
can result in a hung CacheStorage. This CL moves the calls to GetUsageAndQuota
to just before the operations are scheduled. This means that the size estimate
is less accurate, as it's determined potentially well before the operation runs.

BUG=620713

Review-Url: https://codereview.chromium.org/2085583002
Cr-Commit-Position: refs/heads/master@{#401001}
(cherry picked from commit 36dc82c2b7539b33b63cb6f967feae265625d178)
==========

to

==========
[CacheStorage] Don't call GetUsageAndQuota from a scheduled operation

Merge into branch 2704

Scheduled operations run sequentially. GetUsageAndQuota() can sometimes create
a new Size() scheduled operation, so calling it while in a scheduled operation
can result in a hung CacheStorage. This CL moves the calls to GetUsageAndQuota
to just before the operations are scheduled. This means that the size estimate
is less accurate, as it's determined potentially well before the operation runs.

BUG=620713

Review-Url: https://codereview.chromium.org/2085583002
Cr-Commit-Position: refs/heads/master@{#401001}
(cherry picked from commit 36dc82c2b7539b33b63cb6f967feae265625d178)

Committed:
https://chromium.googlesource.com/chromium/src/+/64d27590ccffe40abab3e9560bd8...
==========

[jkarlin, 2016-07-01 13:20:57]

Committed patchset #1 (id:1) manually as
64d27590ccffe40abab3e9560bd886f3624eff23.