Include time elapsed since start of a remoting session in each log entry.

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 8b87f1b5c4efc7273b3cb4ce5f43f36ae5926294..26a3f86e8c78b2046c35aa4f70dac5ceb271b937 100644
--- a/remoting/webapp/crd/js/log_to_server.js
+++ b/remoting/webapp/crd/js/log_to_server.js
@@ -25,7 +25,7 @@ remoting.LogToServer = function(signalStrategy, mode) {
   /** @private */
   this.sessionIdGenerationTime_ = 0;
   /** @private */
-  this.sessionStartTime_ = 0;
+  this.sessionStartTime_ = new Date().getTime();
   /** @private */
   this.signalStrategy_ = signalStrategy;
   /** @private */
@@ -60,12 +60,6 @@ remoting.LogToServer.CONNECTION_STATS_ACCUMULATE_TIME = 60 * 1000;
 remoting.LogToServer.prototype.logClientSessionStateChange =
     function(state, connectionError) {
   this.maybeExpireSessionId_();
-  // Set the session start time if we haven't done so already.
-  if (remoting.LogToServer.isStartOfSession_(state)) {
-    if (this.sessionStartTime_ == 0) {
-      this.sessionStartTime_ = new Date().getTime();
-    }
-  }
   // Log the session state change.
   var entry = remoting.ServerLogEntry.makeClientSessionStateChange(
       state, connectionError, this.mode_);
@@ -74,14 +68,11 @@ remoting.LogToServer.prototype.logClientSessionStateChange =
   entry.addWebappVersionField();
   entry.addSessionIdField(this.sessionId_);
   // Maybe clear the session start time, and log the session duration.
-  if (remoting.LogToServer.shouldAddDuration_(state) &&
-      (this.sessionStartTime_ != 0)) {
+  if (remoting.LogToServer.shouldAddDuration_(state)) {
     entry.addSessionDurationField(
         (new Date().getTime() - this.sessionStartTime_) / 1000.0);
-    if (remoting.LogToServer.isEndOfSession_(state)) {
-      this.sessionStartTime_ = 0;
-    }
   }
+
   this.log_(entry);
   // Don't accumulate connection statistics across state changes.
   this.logAccumulatedStatistics_();
@@ -90,6 +81,7 @@ remoting.LogToServer.prototype.logClientSessionStateChange =
   if (remoting.LogToServer.isEndOfSession_(state)) {
     this.clearSessionId_();
   }
+
 };
 
 /**
@@ -104,13 +96,12 @@ remoting.LogToServer.prototype.setConnectionType = function(connectionType) {
 /**
  * @param {remoting.SignalStrategy.Type} strategyType
  * @param {remoting.FallbackSignalStrategy.Progress} progress
- * @param {number} elapsedTimeInMs
  */
 remoting.LogToServer.prototype.logSignalStrategyProgress =
-    function(strategyType, progress, elapsedTimeInMs) {
+    function(strategyType, progress) {
   this.maybeExpireSessionId_();
   var entry = remoting.ServerLogEntry.makeSignalStrategyProgress(
-      this.sessionId_, strategyType, progress, elapsedTimeInMs);
+      this.sessionId_, strategyType, progress);
   this.log_(entry);
 };
 
@@ -203,6 +194,10 @@ remoting.LogToServer.prototype.logAccumulatedStatistics_ = function() {
  * @param {remoting.ServerLogEntry} entry
  */
 remoting.LogToServer.prototype.log_ = function(entry) {
+  // Log the time taken to get to this point from the time this session started.
+  var elapsedTimeInMs = new Date().getTime() - this.sessionStartTime_;
+  entry.addElapsedTimeMs(elapsedTimeInMs);
+
   // Send the stanza to the debug log.
   console.log('Enqueueing log entry:');
   entry.toDebugLog(1);