[Feedback] Add connection type data to feedback reports.

[Feedback] Add connection type data to feedback reports.

Currently a connection check is performed for feedback reports. This
CL also adds information about the current connection to the report.

The reported data fields are the connection type and the bandwidth,
given in Mbps.

BUG=386395
Committed: https://crrev.com/b8827395a72e786259c24806fcc0f5827e2a88c5
Cr-Commit-Position: refs/heads/master@{#337154}

[nyquist, 2015-07-01 18:24:07]

nyquist@chromium.org changed reviewers:
+ dfalcantara@chromium.org

[nyquist, 2015-07-01 18:24:07]

dfalcantara: PTAL

[gone, 2015-07-01 22:34:33]

lgtm

[nyquist, 2015-07-02 00:53:58]

The CQ bit was checked by nyquist@chromium.org

[nyquist, 2015-07-02 00:53:58]

The patchset sent to the CQ was uploaded after l-g-t-m from
dfalcantara@chromium.org
Link to the patchset: https://codereview.chromium.org/1220053004/#ps20001
(title: "Rebased")

[commit-bot: I haz the power, 2015-07-02 00:54:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1220053004/20001

[commit-bot: I haz the power, 2015-07-02 01:30:55]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-07-02 01:31:55]

Patchset 2 (id:??) landed as
https://crrev.com/b8827395a72e786259c24806fcc0f5827e2a88c5
Cr-Commit-Position: refs/heads/master@{#337154}