Create a mapper to compute browser and renderer startup durations.

tracing/tracing/extras/rail/rail_ir_finder.html

Index: tracing/tracing/extras/rail/rail_ir_finder.html
diff --git a/tracing/tracing/extras/rail/rail_ir_finder.html b/tracing/tracing/extras/rail/rail_ir_finder.html
index d8ddb6939ce406045678a326355751a4cf1581bb..4a718653b56cd3cdeade2a172926e81c7ececb6b 100644
--- a/tracing/tracing/extras/rail/rail_ir_finder.html
+++ b/tracing/tracing/extras/rail/rail_ir_finder.html
@@ -135,6 +135,13 @@ tr.exportTo('tr.e.rail', function() {
       return rirs;
     },
 
+    setIRNames_: function(name, irs) {
+      irs.forEach(function(ir) {

[dsinclair, 2015/08/14 13:18:34]

This is from a different CL, should it be removed from this one to reduce
confusion?

[beaudoin, 2015/08/14 20:28:54]

Yup, it's gone.

This was a git branch on a git branch and there's a way to set the base CL so as
not to confuse the codereview tool, but I always forget how to do it. :)

+        ir.args['name'] = name;
+      });
+      return irs;
+    },
+
     // Find all unassociated top-level ThreadSlices. If they start during an
     // Idle or Load IR, then add their entire hierarchy to that IR.
     collectUnassociatedEvents_: function(rirs) {
@@ -277,16 +284,16 @@ tr.exportTo('tr.e.rail', function() {
       var lirs = [];
 
       // Attach frame events to every main runner events.
-      lirs.push.apply(lirs, this.findLoadInteractionRecords_(mainRunnerEvents,
-          frameEvents));
+      lirs.push.apply(lirs, this.setIRNames_('Startup',
+          this.findLoadInteractionRecords_(mainRunnerEvents, frameEvents)));
 
       // Attach frame events to every commit load events.
-      lirs.push.apply(lirs, this.findLoadInteractionRecords_(commitLoadEvents,
-          frameEvents));
+      lirs.push.apply(lirs, this.setIRNames_('Succeeded',
+          this.findLoadInteractionRecords_(commitLoadEvents, frameEvents)));
 
       // Attach fail load events to every start load events.
-      lirs.push.apply(lirs, this.findLoadInteractionRecords_(startLoadEvents,
-          failLoadEvents));
+      lirs.push.apply(lirs, this.setIRNames_('Failed',
+          this.findLoadInteractionRecords_(startLoadEvents, failLoadEvents)));
 
       return lirs;
     },