[EventTiming] Increase threshold to dispatch entries

Per the spec change, the entry should be dispatched when |duration| is
at least 104. This aligns better with the RAIL guideline of responding
to user input within 100 ms.

Bug: 823744
Change-Id: I7230c04bb7962b5e6403a56cd2b53a56b7a27bcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1592705Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656368}

third_party/blink/renderer/core/timing/window_performance.cc

@@ -62,7 +62,7 @@ namespace {
 // Events taking longer than this threshold to finish being processed are
 // regarded as long-latency events by event-timing. Shorter-latency events are
 // ignored to reduce performance impact.
-constexpr int kEventTimingDurationThresholdInMs = 50;
+constexpr int kEventTimingDurationThresholdInMs = 104;
 
 String GetFrameAttribute(HTMLFrameOwnerElement* frame_owner,
                          const QualifiedName& attr_name,
@@ -379,7 +379,7 @@ void WindowPerformance::ReportEventTimings(WebWidgetClient::SwapResult result,
             PerformanceEventTiming::CreateFirstInputTiming(entry));
       }
     }
-    if (duration_in_ms <= kEventTimingDurationThresholdInMs)
+    if (duration_in_ms < kEventTimingDurationThresholdInMs)
       continue;
 
     if (HasObserverFor(PerformanceEntry::kEvent)) {

third_party/blink/web_tests/external/wpt/event-timing/resources/event-timing-support.js

@@ -8,7 +8,7 @@ function clickOnElement(id, callback) {
   const yCenter = rect.y + rect.height / 2;
   const leftButton = 0;
   const clickHandler = () => {
-    mainThreadBusy(60);
+    mainThreadBusy(120);
     if (callback)
       callback();
     element.removeEventListener("mousedown", clickHandler);
@@ -29,8 +29,8 @@ function verifyClickEvent(entry, is_first=false) {
   assert_true(entry.cancelable);
   assert_equals(entry.name, 'mousedown');
   assert_equals(entry.entryType, 'event');
-  assert_greater_than(entry.duration, 50,
-      "The entry's duration should be greater than 50ms.");
+  assert_greater_than_equal(entry.duration, 104,
+      "The entry's duration should be greater than or equal to 104 ms.");
   assert_greater_than(entry.processingStart, entry.startTime,
       "The entry's processingStart should be greater than startTime.");
   assert_greater_than_equal(entry.processingEnd, entry.processingStart,