Log the time interval between adjacent JumpList update notifications

chrome/browser/win/jumplist.cc

Index: chrome/browser/win/jumplist.cc
diff --git a/chrome/browser/win/jumplist.cc b/chrome/browser/win/jumplist.cc
index 7ebb5eab0553e7be09175a4f82c941bac03e2de6..0a222449bb01c586e8031dc37adb119e6426047b 100644
--- a/chrome/browser/win/jumplist.cc
+++ b/chrome/browser/win/jumplist.cc
@@ -309,6 +309,10 @@ void JumpList::InitializeTimerForUpdate() {
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
 
   if (timer_.IsRunning()) {
+    // TODO(chengx): Remove the UMA histogram below after fixing crbug/733034.
+    UMA_HISTOGRAM_COUNTS_10000(
+        "WinJumplist.NotificationTimeInterval",
+        (timer_.desired_run_time() - base::TimeTicks::Now()).InMilliseconds());
     timer_.Reset();
   } else {
     // base::Unretained is safe since |this| is guaranteed to outlive timer_.