This relands the conversion tool from RtcEventLog files to RTPdump format.

This relands "Tool to convert RtcEventLog files to RtpDump format.", commit 35624c2c3686a2ad40daffe073aa78507b0ef88e.

Moved the build target into a section in the gyp file that is conditional on 'include_test==1', as well as on 'enable_protobuf==1'.
Original review: https://codereview.webrtc.org/1297653002/
Reverted in be4959535a39262e1508cc4223b78b8db677cb94

BUG=webrtc:4741
TBR=kjellander@webrtc.org,stefan@webrtc.org,henrik.lundin@webrtc.org

Committed: https://crrev.com/e1aa5b530d300e562409017766d72a791055c5e0
Cr-Commit-Position: refs/heads/master@{#9990}

[ivoc, 2015-09-18 12:41:27]

The CQ bit was checked by ivoc@webrtc.org to run a CQ dry run

[commit-bot: I haz the power, 2015-09-18 12:41:31]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1353083003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1353083003/1

[commit-bot: I haz the power, 2015-09-18 13:39:28]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-18 13:39:28]

Dry run: This issue passed the CQ dry run.

[ivoc, 2015-09-18 13:41:28]

Committed patchset #1 (id:1) manually as
e1aa5b530d300e562409017766d72a791055c5e0 (presubmit successful).

[commit-bot: I haz the power, 2015-09-18 13:41:30]

Patchset 1 (id:??) landed as
https://crrev.com/e1aa5b530d300e562409017766d72a791055c5e0
Cr-Commit-Position: refs/heads/master@{#9990}

[kjellander_webrtc, 2015-09-20 17:54:40]

lgtm

[hlundin-webrtc, 2015-09-21 12:30:41]

lgtm