Sort revision numebrs numerically rather than alphabetically....

tools/buildbot/perf/dashboard/ui/generic_plotter.html

Index: tools/buildbot/perf/dashboard/ui/generic_plotter.html
===================================================================
--- tools/buildbot/perf/dashboard/ui/generic_plotter.html	(revision 10124)
+++ tools/buildbot/perf/dashboard/ui/generic_plotter.html	(working copy)
@@ -243,11 +243,12 @@
     traceNames.push(traceName);
   traceNames.sort(trace_compare);
 
-  // Build and sort a list of revision numbers.
+  // Build and numerically sort a list of revision numbers.
   var revisionNumbers = [];
   for (var rev in graphData)
     revisionNumbers.push(rev);
-  revisionNumbers.sort();
+  revisionNumbers.sort(
+      function(a, b) { return parseInt(a, 10) - parseInt(b, 10) });
 
   // Build separate ordered lists of trace data.
   var traceData = {};