Support Promises instrumentation on backend.

LayoutTests/inspector/debugger/async-callstack-promises-simple-expected.txt

Index: LayoutTests/inspector/debugger/async-callstack-promises-simple-expected.txt
diff --git a/LayoutTests/inspector/debugger/async-callstack-promises-simple-expected.txt b/LayoutTests/inspector/debugger/async-callstack-promises-simple-expected.txt
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index 0000000000000000000000000000000000000000..3a8039380ed69b4d829c3eb65345ffd9b124f57c
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+++ b/LayoutTests/inspector/debugger/async-callstack-promises-simple-expected.txt
@@ -0,0 +1,31 @@
+Tests asynchronous call stacks for SIMPLE Promises.
+
+Debugger was enabled.
+Set timer for test function.
+Captured call stacks in no particular order:
+Call stack:
+    0) errorCallback (async-callstack-promises-simple.html:44)
+    [Promise.reject]
+    0) rejectPromise (async-callstack-promises-simple.html:16)
+    [setTimeout]
+    0) promiseCallback (async-callstack-promises-simple.html:19)
+    1) timeoutPromise (async-callstack-promises-simple.html:9)
+    2) doTestPromiseResolveAndReject (async-callstack-promises-simple.html:50)
+    3) testFunctionTimeout (async-callstack-promises-simple.html:34)
+    [setTimeout]
+    0) testFunction (async-callstack-promises-simple.html:27)
+
+Call stack:
+    0) thenCallback (async-callstack-promises-simple.html:39)
+    [Promise.resolve]
+    0) resolvePromise (async-callstack-promises-simple.html:12)
+    [setTimeout]
+    0) promiseCallback (async-callstack-promises-simple.html:21)
+    1) timeoutPromise (async-callstack-promises-simple.html:9)
+    2) doTestPromiseResolveAndReject (async-callstack-promises-simple.html:49)
+    3) testFunctionTimeout (async-callstack-promises-simple.html:34)
+    [setTimeout]
+    0) testFunction (async-callstack-promises-simple.html:27)
+
+Debugger was disabled.
+