Offline Page Cache: do not save a snapshot of a page loaded from a snapshot.

Offline Page Cache: do not save a snapshot of a page loaded from a snapshot.

Offline Page Cache was saving snapshots of pages being loaded from
previously saved snapshots, which is unnecessary. This change fixes that
by only enabling the saving if the loaded page is not an "offline" page
itself.

BUG=660106
Review-Url: https://codereview.chromium.org/2448143005
Cr-Commit-Position: refs/heads/master@{#428239}
(cherry picked from commit ff2b583208f110e3217e5879a6681b3e1875f7bb)

Committed: https://chromium.googlesource.com/chromium/src/+/55afac3f35ed774b0a1cd79985f495e158fc2da3

[carlosk, 2016-10-28 22:42:02]

Description was changed from

==========
Offline Page Cache: do not save a snapshot of a page loaded from a snapshot.

Offline Page Cache was saving snapshots of pages being loaded from
previously saved snapshots, which is unnecessary. This change fixes that
by only enabling the saving if the loaded page is not an "offline" page
itself.

BUG=660106

Review-Url: https://codereview.chromium.org/2448143005
Cr-Commit-Position: refs/heads/master@{#428239}
(cherry picked from commit ff2b583208f110e3217e5879a6681b3e1875f7bb)
==========

to

==========
Offline Page Cache: do not save a snapshot of a page loaded from a snapshot.

Offline Page Cache was saving snapshots of pages being loaded from
previously saved snapshots, which is unnecessary. This change fixes that
by only enabling the saving if the loaded page is not an "offline" page
itself.

BUG=660106

Review-Url: https://codereview.chromium.org/2448143005
Cr-Commit-Position: refs/heads/master@{#428239}
(cherry picked from commit ff2b583208f110e3217e5879a6681b3e1875f7bb)

Committed:
https://chromium.googlesource.com/chromium/src/+/55afac3f35ed774b0a1cd79985f4...
==========

[carlosk, 2016-10-28 22:42:04]

Committed patchset #1 (id:1) manually as
55afac3f35ed774b0a1cd79985f495e158fc2da3.