Start logging host-version info in the Chromoting client.

remoting/webapp/crd/js/log_to_server.js

Index: remoting/webapp/crd/js/log_to_server.js
diff --git a/remoting/webapp/crd/js/log_to_server.js b/remoting/webapp/crd/js/log_to_server.js
index e76f67a6662b33bb9e1202d3e25b0ffbb7f1c524..d03616fba9221a93f1b593969981dbdffb663c5c 100644
--- a/remoting/webapp/crd/js/log_to_server.js
+++ b/remoting/webapp/crd/js/log_to_server.js
@@ -31,6 +31,8 @@ remoting.LogToServer = function(signalStrategy) {
   this.connectionType_ = '';
   /** @private */
   this.authTotalTime_ = 0;
+  /** @private {string} */
+  this.hostVersion_ = '';
 
   this.setSessionId_();
   signalStrategy.sendConnectionSetupResults(this);
@@ -178,6 +180,9 @@ remoting.LogToServer.prototype.log_ = function(entry) {
       (new Date().getTime() - this.sessionStartTime_ -
           this.authTotalTime_) / 1000.0;
   entry.addSessionDuration(sessionDurationInSeconds);
+  // The host-version will be blank for logs before a session has been created.
+  // For example, the signal-strategy log-entries won't have host version info.

[Jamie, 2015/04/24 20:34:02]

Is this true even for multiple connections from the same instance of the app? I
don't see the host version being explicitly cleared anywhere.

[anandc, 2015/04/24 21:36:35]

Yes. It's because a new logToServer object is created for each new session:
https://code.google.com/p/chromium/codesearch#chromium/src/remoting/webapp/cr...
and the constructor for logToServer sets it to blank.
Also confirmed by testing multiple connections, to the same machine and to
different machines, IT2Me and Me2Me, simultaneous and sequential connections,
within the same instance of the app.

+  entry.addHostVersion(this.hostVersion_);
 
   // Send the stanza to the debug log.
   console.log('Enqueueing log entry:');
@@ -260,3 +265,11 @@ remoting.LogToServer.prototype.setAuthTotalTime = function(totalTime) {
   this.authTotalTime_ = totalTime;
 };
 
+/**
+ * @param {string} hostVersion Version of the host for current session.
+ * @return {void} Nothing.
+ */
+remoting.LogToServer.prototype.setHostVersion = function(hostVersion) {
+  this.hostVersion_ = hostVersion;
+};
+