[DevTools] added creation stack for event listeners without scheduled stack

third_party/WebKit/LayoutTests/http/tests/inspector/sources/debugger/async-callstack-onload-expected.txt

Index: third_party/WebKit/LayoutTests/http/tests/inspector/sources/debugger/async-callstack-onload-expected.txt
diff --git a/third_party/WebKit/LayoutTests/http/tests/inspector/sources/debugger/async-callstack-onload-expected.txt b/third_party/WebKit/LayoutTests/http/tests/inspector/sources/debugger/async-callstack-onload-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e9d8ef7cb1c95287fad260fb7587ba00b8ff751f
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/http/tests/inspector/sources/debugger/async-callstack-onload-expected.txt
@@ -0,0 +1,21 @@
+Tests asynchronous call stacks for onload.
+
+Set timer for test function.
+Captured call stacks in no particular order:
+Call stack:
+    0) onImageError (async-callstack-onload.html:22)
+    [Event Listener]
+    0) testFunction (async-callstack-onload.html:11)
+    [setTimeout]
+    0) scheduleTestFunction (debugger-test.js:3)
+    <... skipped remaining frames ...>
+
+Call stack:
+    0) onImageLoaded (async-callstack-onload.html:16)
+    [Event Listener]
+    0) testFunction (async-callstack-onload.html:10)
+    [setTimeout]
+    0) scheduleTestFunction (debugger-test.js:3)
+    <... skipped remaining frames ...>
+
+