Report downloaded resources at most once

Report downloaded resources at most once

Before, we were reporting used_resources and unused_resources. used_resources was reported only once when the resource is used but unused_resources was reported on every single prefetch session for as long as the resource was still unused.

This change removes unused_resources and adds downloaded resources (with URL parameter d), which reports the "cost" of a resource once. This allows to have a meaningful ratio of used_resources / downloaded_resources.

BUG=675732
Review-Url: https://codereview.chromium.org/2586813004
Cr-Commit-Position: refs/heads/master@{#440176}
(cherry picked from commit 02bf6c04e45ee64670eb9e6cd3a05c54d9a2eaa0)

Committed: https://chromium.googlesource.com/chromium/src/+/c85e96f98e7d442b87e219fe0631c92b7c176b54

[twifkak, 2017-01-03 23:45:09]

Description was changed from

==========
Report downloaded resources at most once

Before, we were reporting used_resources and unused_resources. used_resources
was reported only once when the resource is used but unused_resources was
reported on every single prefetch session for as long as the resource was still
unused.

This change removes unused_resources and adds downloaded resources (with URL
parameter d), which reports the "cost" of a resource once. This allows to have a
meaningful ratio of used_resources / downloaded_resources.

BUG=675732

Review-Url: https://codereview.chromium.org/2586813004
Cr-Commit-Position: refs/heads/master@{#440176}
(cherry picked from commit 02bf6c04e45ee64670eb9e6cd3a05c54d9a2eaa0)
==========

to

==========
Report downloaded resources at most once

Before, we were reporting used_resources and unused_resources. used_resources
was reported only once when the resource is used but unused_resources was
reported on every single prefetch session for as long as the resource was still
unused.

This change removes unused_resources and adds downloaded resources (with URL
parameter d), which reports the "cost" of a resource once. This allows to have a
meaningful ratio of used_resources / downloaded_resources.

BUG=675732

Review-Url: https://codereview.chromium.org/2586813004
Cr-Commit-Position: refs/heads/master@{#440176}
(cherry picked from commit 02bf6c04e45ee64670eb9e6cd3a05c54d9a2eaa0)

Committed:
https://chromium.googlesource.com/chromium/src/+/c85e96f98e7d442b87e219fe0631...
==========

[twifkak, 2017-01-03 23:45:10]

Committed patchset #1 (id:1) manually as
c85e96f98e7d442b87e219fe0631c92b7c176b54.