Add once field to devtools so it can be queried by lighthouse.

third_party/WebKit/LayoutTests/inspector/console/command-line-api-getEventListeners-expected.txt

Index: third_party/WebKit/LayoutTests/inspector/console/command-line-api-getEventListeners-expected.txt
diff --git a/third_party/WebKit/LayoutTests/inspector/console/command-line-api-getEventListeners-expected.txt b/third_party/WebKit/LayoutTests/inspector/console/command-line-api-getEventListeners-expected.txt
index aa2ac9f1d4086048dc0e31a9b3a72d202b10a9b9..c2f57434d63c2b0574571564039f54539445d899 100644
--- a/third_party/WebKit/LayoutTests/inspector/console/command-line-api-getEventListeners-expected.txt
+++ b/third_party/WebKit/LayoutTests/inspector/console/command-line-api-getEventListeners-expected.txt
@@ -6,6 +6,7 @@ Tests getEventListeners() method of console command line API.
 [page] keydown: {
 [page]     0: {
 [page]         listener: function listener1() { }
+[page]         once: false
 [page]         passive: false
 [page]         remove: function remove() { [Command Line API] }
 [page]         type: "keydown"
@@ -13,6 +14,7 @@ Tests getEventListeners() method of console command line API.
 [page]     }
 [page]     1: {
 [page]         listener: function listener2() { }
+[page]         once: false
 [page]         passive: false
 [page]         remove: function remove() { [Command Line API] }
 [page]         type: "keydown"
@@ -22,6 +24,7 @@ Tests getEventListeners() method of console command line API.
 [page] wheel: {
 [page]     0: {
 [page]         listener: function listener2() { }
+[page]         once: false
 [page]         passive: true
 [page]         remove: function remove() { [Command Line API] }
 [page]         type: "wheel"
@@ -32,6 +35,7 @@ Tests getEventListeners() method of console command line API.
 [page] keydown: {
 [page]     0: {
 [page]         listener: function listener2() { }
+[page]         once: false
 [page]         passive: false
 [page]         remove: function remove() { [Command Line API] }
 [page]         type: "keydown"
@@ -42,15 +46,27 @@ Tests getEventListeners() method of console command line API.
 [page] keydown: {
 [page]     0: {
 [page]         listener: function listener2() { }
+[page]         once: false
 [page]         passive: false
 [page]         remove: function remove() { [Command Line API] }
 [page]         type: "keydown"
 [page]         useCapture: true
 [page]     }
 [page] }
+[page] keyup: {
+[page]     0: {
+[page]         listener: function listener2() { }
+[page]         once: true
+[page]         passive: false
+[page]         remove: function remove() { [Command Line API] }
+[page]         type: "keyup"
+[page]         useCapture: false
+[page]     }
+[page] }
 [page] mousedown: {
 [page]     0: {
 [page]         listener: function listener2() { }
+[page]         once: false
 [page]         passive: false
 [page]         remove: function remove() { [Command Line API] }
 [page]         type: "mousedown"
@@ -60,6 +76,7 @@ Tests getEventListeners() method of console command line API.
 [page] mousemove: {
 [page]     0: {
 [page]         listener: function listener1() { }
+[page]         once: false
 [page]         passive: false
 [page]         remove: function remove() { [Command Line API] }
 [page]         type: "mousemove"
@@ -70,6 +87,7 @@ Tests getEventListeners() method of console command line API.
 [page] click: {
 [page]     0: {
 [page]         listener: function onclick(event) { alert(1) }
+[page]         once: false
 [page]         passive: false
 [page]         remove: function remove() { [Command Line API] }
 [page]         type: "click"
@@ -79,6 +97,7 @@ Tests getEventListeners() method of console command line API.
 [page] mouseover: {
 [page]     0: {
 [page]         listener: function onmouseover(event) { listener2() }
+[page]         once: false
 [page]         passive: false
 [page]         remove: function remove() { [Command Line API] }
 [page]         type: "mouseover"
@@ -89,6 +108,7 @@ Tests getEventListeners() method of console command line API.
 [page] load: {
 [page]     0: {
 [page]         listener: function onload(event) { runTest() }
+[page]         once: false
 [page]         passive: false
 [page]         remove: function remove() { [Command Line API] }
 [page]         type: "load"
@@ -98,6 +118,7 @@ Tests getEventListeners() method of console command line API.
 [page] popstate: {
 [page]     0: {
 [page]         listener: function listener1() { }
+[page]         once: false
 [page]         passive: false
 [page]         remove: function remove() { [Command Line API] }
 [page]         type: "popstate"