DevTools: Support XHR async call stacks in the debugger.

LayoutTests/inspector/debugger/async-callstack-middle-run-expected.txt

Index: LayoutTests/inspector/debugger/async-callstack-middle-run-expected.txt
diff --git a/LayoutTests/inspector/debugger/async-callstack-middle-run-expected.txt b/LayoutTests/inspector/debugger/async-callstack-middle-run-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0c201ed4a016191f2d6663e7401fbfd04098f510
--- /dev/null
+++ b/LayoutTests/inspector/debugger/async-callstack-middle-run-expected.txt
@@ -0,0 +1,48 @@
+Tests that capturing asynchronous call stacks in debugger works if started after some time since the page loads.
+
+Debugger was enabled.
+Set timer for test function.
+Captured call stacks in no particular order:
+Call stack:
+    0) onClick (async-callstack-middle-run.html:55)
+    1) clickedOnCapturing (async-callstack-middle-run.html:39)
+    2) onClick (async-callstack-middle-run.html:52)
+    3) clickedOffCapturing (async-callstack-middle-run.html:38)
+    4) onClick (async-callstack-middle-run.html:49)
+    5) clickedOnCapturing (async-callstack-middle-run.html:39)
+    6) onClick (async-callstack-middle-run.html:46)
+    7) clickedOffCapturing (async-callstack-middle-run.html:38)
+    8) timeoutOnCapturing (async-callstack-middle-run.html:32)
+    [setTimeout]
+    0) timeoutOffCapturing (async-callstack-middle-run.html:21)
+
+Call stack:
+    0) onClick (async-callstack-middle-run.html:55)
+    1) clickedOnCapturing (async-callstack-middle-run.html:39)
+    2) onClick (async-callstack-middle-run.html:52)
+    3) clickedOffCapturing (async-callstack-middle-run.html:38)
+    4) onClick (async-callstack-middle-run.html:49)
+    5) clickedOnCapturing (async-callstack-middle-run.html:39)
+    6) timeoutOnCapturing (async-callstack-middle-run.html:33)
+    [setTimeout]
+    0) timeoutOffCapturing (async-callstack-middle-run.html:21)
+
+Call stack:
+    0) onImageError (async-callstack-middle-run.html:76)
+    1) imageErrorOffCapturing (async-callstack-middle-run.html:60)
+
+Call stack:
+    0) onImageError (async-callstack-middle-run.html:79)
+    1) imageErrorOnCapturing (async-callstack-middle-run.html:61)
+    [Node.addEventListener("error")]
+    0) timeoutOnCapturing (async-callstack-middle-run.html:30)
+    [setTimeout]
+    0) timeoutOffCapturing (async-callstack-middle-run.html:21)
+
+Call stack:
+    0) timeoutOnCapturing (async-callstack-middle-run.html:26)
+    [setTimeout]
+    0) timeoutOffCapturing (async-callstack-middle-run.html:21)
+
+Debugger was disabled.
+