Fix the xrange calculation of the V8 timeline plot

tools/plot-timer-events.js

Index: tools/plot-timer-events.js
diff --git a/tools/plot-timer-events.js b/tools/plot-timer-events.js
index 0a5e5221ae210523f8de835265aad981b1bd1786..c7463a10ef68ee3471c4d7d98c53146511115077 100644
--- a/tools/plot-timer-events.js
+++ b/tools/plot-timer-events.js
@@ -276,13 +276,15 @@ function FindPlotRange() {
 
   if (start_found && end_found) return;
 
-  var execution_ranges = kExecutionEvent.ranges;
-  for (var i = 0; i < execution_ranges.length; i++) {
-    if (execution_ranges[i].start < xrange_start && !start_found) {
-      xrange_start = execution_ranges[i].start;
-    }
-    if (execution_ranges[i].end > xrange_end && !end_found) {
-      xrange_end = execution_ranges[i].end;
+  for (name in TimerEvents) {
+    var ranges = TimerEvents[name].ranges;
+    for (var i = 0; i < ranges.length; i++) {
+      if (ranges[i].start < xrange_start && !start_found) {
+        xrange_start = ranges[i].start;
+      }
+      if (ranges[i].end > xrange_end && !end_found) {
+        xrange_end = ranges[i].end;
+      }
     }
   }