DevTools: Support XHR async call stacks in the debugger.

LayoutTests/inspector/debugger/async-callstack-xhrs-expected.txt

Index: LayoutTests/inspector/debugger/async-callstack-xhrs-expected.txt
diff --git a/LayoutTests/inspector/debugger/async-callstack-xhrs-expected.txt b/LayoutTests/inspector/debugger/async-callstack-xhrs-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..42ff7263ecdc9c3f5b824ace2705c2dda5b09c5e
--- /dev/null
+++ b/LayoutTests/inspector/debugger/async-callstack-xhrs-expected.txt
@@ -0,0 +1,68 @@
+Tests asynchronous call stacks for XHRs.
+
+Debugger was enabled.
+Set timer for test function.
+Captured call stacks in no particular order:
+Call stack:
+    0) downloadEnd (async-callstack-xhrs.html:36)
+    1) sendXHR (async-callstack-xhrs.html:60)
+    2) sendSyncXHR (async-callstack-xhrs.html:21)
+    3) timeout (async-callstack-xhrs.html:16)
+    [setTimeout]
+    0) testFunction (async-callstack-xhrs.html:11)
+
+Call stack:
+    0) downloadEnd (async-callstack-xhrs.html:36)
+    [XMLHttpRequest.send]
+    0) sendXHR (async-callstack-xhrs.html:60)
+    1) sendAsyncXHR (async-callstack-xhrs.html:20)
+    2) timeout (async-callstack-xhrs.html:17)
+    [setTimeout]
+    0) testFunction (async-callstack-xhrs.html:11)
+
+Call stack:
+    0) downloadProgress (async-callstack-xhrs.html:45)
+    [XMLHttpRequest.send]
+    0) sendXHR (async-callstack-xhrs.html:60)
+    1) sendAsyncXHR (async-callstack-xhrs.html:20)
+    2) timeout (async-callstack-xhrs.html:17)
+    [setTimeout]
+    0) testFunction (async-callstack-xhrs.html:11)
+
+Call stack:
+    0) uploadEnd (async-callstack-xhrs.html:41)
+    [XMLHttpRequest.send]
+    0) sendXHR (async-callstack-xhrs.html:60)
+    1) sendAsyncXHR (async-callstack-xhrs.html:20)
+    2) timeout (async-callstack-xhrs.html:17)
+    [setTimeout]
+    0) testFunction (async-callstack-xhrs.html:11)
+
+Call stack:
+    0) uploadProgress (async-callstack-xhrs.html:50)
+    [XMLHttpRequest.send]
+    0) sendXHR (async-callstack-xhrs.html:60)
+    1) sendAsyncXHR (async-callstack-xhrs.html:20)
+    2) timeout (async-callstack-xhrs.html:17)
+    [setTimeout]
+    0) testFunction (async-callstack-xhrs.html:11)
+
+Call stack:
+    0) xhr.onreadystatechange (async-callstack-xhrs.html:30)
+    1) sendXHR (async-callstack-xhrs.html:60)
+    2) sendSyncXHR (async-callstack-xhrs.html:21)
+    3) timeout (async-callstack-xhrs.html:16)
+    [setTimeout]
+    0) testFunction (async-callstack-xhrs.html:11)
+
+Call stack:
+    0) xhr.onreadystatechange (async-callstack-xhrs.html:30)
+    [XMLHttpRequest.send]
+    0) sendXHR (async-callstack-xhrs.html:60)
+    1) sendAsyncXHR (async-callstack-xhrs.html:20)
+    2) timeout (async-callstack-xhrs.html:17)
+    [setTimeout]
+    0) testFunction (async-callstack-xhrs.html:11)
+
+Debugger was disabled.
+