Precache should cancel when there is user traffic

Precache should cancel when there is user traffic

When any user initiated traffic is seen during the precache fetches,
precache should be cancelled.

BUG=619221
Review-Url: https://codereview.chromium.org/2061303003
Cr-Commit-Position: refs/heads/master@{#404474}
(cherry picked from commit 1e1eff17348e9dca71bf17081b0e4cc6c2212d3b)

Committed: https://chromium.googlesource.com/chromium/src/+/9840b2772bafea0ff15ee6b0110df8af88549dbe

[twifkak, 2016-08-01 22:39:45]

Description was changed from

==========
Precache should cancel when there is user traffic

When any user initiated traffic is seen during the precache fetches,
precache should be cancelled.

BUG=619221

Review-Url: https://codereview.chromium.org/2061303003
Cr-Commit-Position: refs/heads/master@{#404474}
(cherry picked from commit 1e1eff17348e9dca71bf17081b0e4cc6c2212d3b)
==========

to

==========
Precache should cancel when there is user traffic

When any user initiated traffic is seen during the precache fetches,
precache should be cancelled.

BUG=619221

Review-Url: https://codereview.chromium.org/2061303003
Cr-Commit-Position: refs/heads/master@{#404474}
(cherry picked from commit 1e1eff17348e9dca71bf17081b0e4cc6c2212d3b)

Committed:
https://chromium.googlesource.com/chromium/src/+/9840b2772bafea0ff15ee6b0110d...
==========

[twifkak, 2016-08-01 22:39:47]

Committed patchset #1 (id:1) manually as
9840b2772bafea0ff15ee6b0110df8af88549dbe.