[DevTools] enable async stacks by default

third_party/WebKit/LayoutTests/inspector/console/exception-objects-expected.txt

Index: third_party/WebKit/LayoutTests/inspector/console/exception-objects-expected.txt
diff --git a/third_party/WebKit/LayoutTests/inspector/console/exception-objects-expected.txt b/third_party/WebKit/LayoutTests/inspector/console/exception-objects-expected.txt
index 901db821590974db5434d8acaa05be4e33e41493..06770afaba221970aafce2b1567c867b77fc0dc9 100644
--- a/third_party/WebKit/LayoutTests/inspector/console/exception-objects-expected.txt
+++ b/third_party/WebKit/LayoutTests/inspector/console/exception-objects-expected.txt
@@ -12,6 +12,8 @@ undefined
 foo.js:4 Uncaught Error: error_text
     at throwError (foo.js:4)
 throwError @ foo.js:4
+setTimeout (async)
+(anonymous) @ VM:1
 throwError();
 foo.js:4 Uncaught Error: error_text
     at throwError (foo.js:4)
@@ -22,6 +24,8 @@ setTimeout(throwObject, 0); undefined
 undefined
 foo.js:9 Uncaught Object {a: 42}
 throwObject @ foo.js:9
+setTimeout (async)
+(anonymous) @ VM:1
 throwObject();
 foo.js:9 Uncaught Object {a: 42}
 throwObject @ foo.js:9
@@ -30,6 +34,8 @@ setTimeout(throwNumber, 0); undefined
 undefined
 foo.js:14 Uncaught 42
 throwNumber @ foo.js:14
+setTimeout (async)
+(anonymous) @ VM:1
 throwNumber();
 foo.js:14 Uncaught 42
 throwNumber @ foo.js:14
@@ -39,6 +45,8 @@ undefined
 foo.js:19 Uncaught (in promise) Error: promise_error
     at rejectWithError (foo.js:19)
 rejectWithError @ foo.js:19
+setTimeout (async)
+(anonymous) @ VM:1
 rejectWithError();
 undefined
 foo.js:19 Uncaught (in promise) Error: promise_error
@@ -50,6 +58,8 @@ setTimeout(rejectWithObject, 0); undefined
 undefined
 foo.js:24 Uncaught (in promise) Object {b: 42}
 rejectWithObject @ foo.js:24
+setTimeout (async)
+(anonymous) @ VM:1
 rejectWithObject();
 undefined
 foo.js:24 Uncaught (in promise) Object {b: 42}