Add the ability to return descedant event listeners.

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

Index: third_party/WebKit/LayoutTests/inspector/console/command-line-api-getEventListeners.html
diff --git a/third_party/WebKit/LayoutTests/inspector/console/command-line-api-getEventListeners.html b/third_party/WebKit/LayoutTests/inspector/console/command-line-api-getEventListeners.html
index cbd67914d02719734363fb20019fc4a64feddbcd..c12975027349fea34e52e1903c396a89c1bb2b14 100644
--- a/third_party/WebKit/LayoutTests/inspector/console/command-line-api-getEventListeners.html
+++ b/third_party/WebKit/LayoutTests/inspector/console/command-line-api-getEventListeners.html
@@ -24,6 +24,7 @@ Tests getEventListeners() method of console command line API.
 </div>
 <button id="button" onclick="alert(1)" onmouseover="listener2()"></button>
 <button id="invalid" onclick="Invalid JavaScript"></button>
+<iframe id="aframe" src="resources/eventlistener-in-iframe.html"></iframe>
 <script>
 function listener1()
 {
@@ -38,6 +39,8 @@ document.getElementById("inner").addEventListener("wheel", listener2, {"passive"
 document.getElementById("outer").addEventListener("mousemove", listener1, false);
 document.getElementById("outer").addEventListener("mousedown", listener2, true);
 document.getElementById("outer").addEventListener("keydown", listener2, true);
+document.getElementById("aframe").addEventListener("wheel", listener2, {"passive": true});
+document.getElementById("aframe").addEventListener("keydown", listener2, true);
 window.addEventListener("popstate", listener1, false);
 
 function dumpObject(object, prefix)
@@ -102,6 +105,16 @@ function runTestsInPage(getEventListeners)
     output(typeof getEventListeners(null));
     output("- undefined -");
     output(typeof getEventListeners(undefined));
+    output("- descendants window -");
+    dumpObject(getEventListeners(window, {descendants: true}));
+    output("- descendants document -");
+    dumpObject(getEventListeners(document, {descendants: true}));
+    output("- descendants iframe -");
+    dumpObject(getEventListeners(document.getElementById("aframe"), {descendants: true}));
+    output("- descendants window passive -");
+    dumpObject(getEventListeners(window, {descendants: true, passive: true}));
+    output("- descendants window blocking -");
+    dumpObject(getEventListeners(window, {descendants: true, passive: false}));
 }
 
 </script>