Precache manifest should not be added to fetcher pool which is full

Precache manifest should not be added to fetcher pool which is full

Fetcher pool accepts limited number of requests which are fetched in
parallel. If the pool is full, precache manifest resources should not be
added to it.

BUG=606231
Review-Url: https://codereview.chromium.org/2037903002
Cr-Commit-Position: refs/heads/master@{#399387}
(cherry picked from commit b2754f713e984d267353ce00d8a9e5ff6a6fafae)

Committed: https://chromium.googlesource.com/chromium/src/+/ad72f670be610f05a71251b012dd47d9e32c53a5

[tbansal1, 2016-06-30 20:48:51]

Description was changed from

==========
Precache manifest should not be added to fetcher pool which is full

Fetcher pool accepts limited number of requests which are fetched in
parallel. If the pool is full, precache manifest resources should not be
added to it.

BUG=606231

Review-Url: https://codereview.chromium.org/2037903002
Cr-Commit-Position: refs/heads/master@{#399387}
(cherry picked from commit b2754f713e984d267353ce00d8a9e5ff6a6fafae)
==========

to

==========
Precache manifest should not be added to fetcher pool which is full

Fetcher pool accepts limited number of requests which are fetched in
parallel. If the pool is full, precache manifest resources should not be
added to it.

BUG=606231

Review-Url: https://codereview.chromium.org/2037903002
Cr-Commit-Position: refs/heads/master@{#399387}
(cherry picked from commit b2754f713e984d267353ce00d8a9e5ff6a6fafae)

Committed:
https://chromium.googlesource.com/chromium/src/+/ad72f670be610f05a71251b012dd...
==========

[tbansal1, 2016-06-30 20:48:52]

Committed patchset #1 (id:1) manually as
ad72f670be610f05a71251b012dd47d9e32c53a5.

[tbansal1, 2016-06-30 21:39:21]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2111293002/ by tbansal@chromium.org.

The reason for reverting is: Broke the official.desktop.continuous

https://bugs.chromium.org/p/chromium/issues/detail?id=624936.