Cast: Split kDuplicatePacketReceived into separate events for audio/video.

Cast: Split kDuplicatePacketReceived into separate events for audio/video.

This change brings this type of event in line with the rest - having separate types
for audio / video. As a new type that is potentially sent over in RTCP is introduced,
a new RTCP encoding for that type is added as well.

This change is backwards-compatible because these events aren't being sent over in RTCP because they are not processed by ReceiverRtcpEventSubscriber.

BUG=337901
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=251301

[imcheng, 2014-02-13 20:22:48]

This is my proposal to fix issue 337901. This should allow the subscriber to
tell whether a duplicated packet event is from video or audio.

[mikhal1, 2014-02-13 20:48:33]

lgtm

[imcheng, 2014-02-13 20:55:50]

The CQ bit was checked by imcheng@chromium.org

[commit-bot: I haz the power, 2014-02-13 20:57:16]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/imcheng@chromium.org/164253003/1

[commit-bot: I haz the power, 2014-02-14 00:51:26]

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

[commit-bot: I haz the power, 2014-02-14 00:51:27]

Retried try job too often on linux_chromeos for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_chro...

[imcheng, 2014-02-14 01:06:44]

The CQ bit was checked by imcheng@chromium.org

[commit-bot: I haz the power, 2014-02-14 01:07:36]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/imcheng@chromium.org/164253003/1

[commit-bot: I haz the power, 2014-02-14 04:07:57]

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

[commit-bot: I haz the power, 2014-02-14 04:07:58]

Retried try job too often on linux_chromeos for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_chro...

[imcheng, 2014-02-14 04:39:45]

The CQ bit was checked by imcheng@chromium.org

[commit-bot: I haz the power, 2014-02-14 04:41:21]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/imcheng@chromium.org/164253003/1

[commit-bot: I haz the power, 2014-02-14 14:02:40]

Change committed as 251301