[Webapp Refactor] Implements AppConnectedView.

[Webapp Refactor] Implements AppConnectedView.

App remoting relies on the onVideoStreamingStarted() to determine whether it should
hide the loading window and show the remote app.
In the existing implementation, onVideoStreamingStarted() is invoked in remoting.DesktopViewport
which is not part of the shared code.

This CL moves that logic into AppConnectedView.

BUG=465878
Committed: https://crrev.com/7fd718c468244b485cec8f660e04e10a35b433be
Cr-Commit-Position: refs/heads/master@{#321455}

[kelvinp, 2015-03-19 21:18:21]

kelvinp@chromium.org changed reviewers:
+ garykac@chromium.org

[kelvinp, 2015-03-19 21:19:21]

PTAL

https://codereview.chromium.org/1015523005/diff/1/remoting/webapp/app_remotin...
File remoting/webapp/app_remoting/js/app_connected_view.js (right):

https://codereview.chromium.org/1015523005/diff/1/remoting/webapp/app_remotin...
remoting/webapp/app_remoting/js/app_connected_view.js:35: var pingTimer = new
base.RepeatingTimer(function () {
Moved from app_remoting.js.

[garykac, 2015-03-19 21:26:45]

lgtm

[kelvinp, 2015-03-19 21:36:38]

The CQ bit was checked by kelvinp@chromium.org

[commit-bot: I haz the power, 2015-03-19 21:37:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1015523005/1

[commit-bot: I haz the power, 2015-03-19 22:36:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-19 22:36:48]

Patchset 1 (id:??) landed as
https://crrev.com/7fd718c468244b485cec8f660e04e10a35b433be
Cr-Commit-Position: refs/heads/master@{#321455}