third_party/WebKit/LayoutTests/fast/events/event-target-passive-histograms.html - Issue 2137483003: Add UMA metrics for root scroller intervention to track forcing passive breakage.

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Issue 2137483003: Add UMA metrics for root scroller intervention to track forcing passive breakage. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: Use HistogramTester Created 4 years, 5 months ago

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	1 <!DOCTYPE html>

	2 <script src="../../resources/testharness.js"></script>

	3 <script src="../../resources/testharnessreport.js"></script>

	4 <script>

	5

	6 // These constants match the enumeration bucket for the

	7 // Event.PassiveForcedEventDispatchCancelled histogram.

	8 var kPreventDefaultNotCalled = 0;

	9 var kDocumentLevelTouchPreventDefaultCalled = 1;

	10

	11 function histogramCount(bucket)

	12 {

	13 return internals.histogramCount("Event.PassiveForcedEventDispatchCancelled", b ucket);

	14 }

	15

	16 test(function() {

	17 internals.clearHistogramCounts();

	18

	19 var listener = function(e) {

	20 assert_false(e.cancelable);

	21 };

	22

	23 window.addEventListener('touchstart', listener, {});

	24 window.dispatchEvent(new TouchEvent('touchstart', {cancelable: false}));

	25 window.removeEventListener('touchstart', listener, {});

	26

	27 assert_equals(histogramCount(kDocumentLevelTouchPreventDefaultCalled), 0);

	28 assert_equals(histogramCount(kPreventDefaultNotCalled), 1);

	29 }, "Not calling prevent default");

	30

	31 test(function() {

	32 internals.clearHistogramCounts();

	33

	34 var listener = function(e) {

	35 assert_false(e.cancelable);

	36 e.preventDefault();

	37 };

	38

	39 window.addEventListener('touchstart', listener, {});

	40 window.dispatchEvent(new TouchEvent('touchstart', {cancelable: false}));

	41 window.removeEventListener('touchstart', listener, {});

	42

	43 assert_equals(histogramCount(kPreventDefaultNotCalled), 0);

	44 assert_equals(histogramCount(kDocumentLevelTouchPreventDefaultCalled), 1);

	45 }, "Caling prevent default");

	46

	47 </script>

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