[Chromoting] Create core Application interface for CRD.

remoting/webapp/crd/js/client_session.js

Index: remoting/webapp/crd/js/client_session.js
diff --git a/remoting/webapp/crd/js/client_session.js b/remoting/webapp/crd/js/client_session.js
index 81a6ae100184910fee13f67c3442889cec799618..aeaea61c08e5ecbffdd611ab9cc2d926f1b62f8a 100644
--- a/remoting/webapp/crd/js/client_session.js
+++ b/remoting/webapp/crd/js/client_session.js
@@ -1280,6 +1280,10 @@ remoting.ClientSession.prototype.updateDimensions = function() {
   var clientHeight = document.documentElement.clientHeight;
   var parentNode = this.plugin_.element().parentNode;
 
+  // When we receive the first plugin dimensions from the host, we know that
+  // remote host has started.
+  remoting.app.onHostStarted();

[Jamie, 2014/12/04 22:56:58]

The name of this callback is misleading. If the host wasn't started (ie, running
and connected to Talk) then we wouldn't have been able to connect to it in the
first place. Maybe something like onVideoStarted would be a better name?

[garykac, 2014/12/05 19:55:40]

-> onVideoStreamingStarted

+
   console.log('plugin dimensions: ' +
               parentNode.style.left + ',' +
               parentNode.style.top + '-' +