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..2f9e006ee96020f3b32c16865b7f49cd2d7f30ee
--- /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:35)
+    1) sendXHR (async-callstack-xhrs.html:59)
+    2) sendSyncXHR (async-callstack-xhrs.html:19)
+    3) timeout (async-callstack-xhrs.html:14)
+    [setTimeout]
+    0) testFunction (async-callstack-xhrs.html:9)
+
+Call stack:
+    0) downloadEnd (async-callstack-xhrs.html:35)
+    [XMLHttpRequest.send]
+    0) sendXHR (async-callstack-xhrs.html:59)
+    1) sendAsyncXHR (async-callstack-xhrs.html:18)
+    2) timeout (async-callstack-xhrs.html:15)
+    [setTimeout]
+    0) testFunction (async-callstack-xhrs.html:9)
+
+Call stack:
+    0) downloadProgress (async-callstack-xhrs.html:44)
+    [XMLHttpRequest.send]
+    0) sendXHR (async-callstack-xhrs.html:59)
+    1) sendAsyncXHR (async-callstack-xhrs.html:18)
+    2) timeout (async-callstack-xhrs.html:15)
+    [setTimeout]
+    0) testFunction (async-callstack-xhrs.html:9)
+
+Call stack:
+    0) uploadEnd (async-callstack-xhrs.html:40)
+    [XMLHttpRequest.send]
+    0) sendXHR (async-callstack-xhrs.html:59)
+    1) sendAsyncXHR (async-callstack-xhrs.html:18)
+    2) timeout (async-callstack-xhrs.html:15)
+    [setTimeout]
+    0) testFunction (async-callstack-xhrs.html:9)
+
+Call stack:
+    0) uploadProgress (async-callstack-xhrs.html:49)
+    [XMLHttpRequest.send]
+    0) sendXHR (async-callstack-xhrs.html:59)
+    1) sendAsyncXHR (async-callstack-xhrs.html:18)
+    2) timeout (async-callstack-xhrs.html:15)
+    [setTimeout]
+    0) testFunction (async-callstack-xhrs.html:9)
+
+Call stack:
+    0) xhr.onreadystatechange (async-callstack-xhrs.html:29)
+    1) sendXHR (async-callstack-xhrs.html:59)
+    2) sendSyncXHR (async-callstack-xhrs.html:19)
+    3) timeout (async-callstack-xhrs.html:14)
+    [setTimeout]
+    0) testFunction (async-callstack-xhrs.html:9)
+
+Call stack:
+    0) xhr.onreadystatechange (async-callstack-xhrs.html:29)
+    [XMLHttpRequest.send]
+    0) sendXHR (async-callstack-xhrs.html:59)
+    1) sendAsyncXHR (async-callstack-xhrs.html:18)
+    2) timeout (async-callstack-xhrs.html:15)
+    [setTimeout]
+    0) testFunction (async-callstack-xhrs.html:9)
+
+Debugger was disabled.
+