Improve stack traces for async functions

src/inspector/v8-debugger.h

Index: src/inspector/v8-debugger.h
diff --git a/src/inspector/v8-debugger.h b/src/inspector/v8-debugger.h
index 8f02aa0aea2d065bcbc49a8eda03b60a0121ce68..123884bcbcc76d8e3cc51260d97e770c7fc29386 100644
--- a/src/inspector/v8-debugger.h
+++ b/src/inspector/v8-debugger.h
@@ -90,8 +90,9 @@ class V8Debugger {
                                                v8::Local<v8::Value>);
 
   void asyncTaskScheduled(const StringView& taskName, void* task,
-                          bool recurring);
-  void asyncTaskScheduled(const String16& taskName, void* task, bool recurring);
+                          bool recurring, int skipInitialFrames = 0);

[kozy, 2016/09/23 01:27:36]

Please not expose this argument in public API. You can mark frames somehow and
then filter them on frontend side or don't report it from V8 api.

[Dan Ehrenberg, 2016/09/23 04:11:31]

As we discussed off-line, there's nothing special about these stack frames to
mark. I changed the debugger API to not expose skipping initial frames (except
through V8's debug events), and restricted the code to be stricter and only skip
one frame.

+  void asyncTaskScheduled(const String16& taskName, void* task, bool recurring,
+                          int skipInitialFrames = 0);
   void asyncTaskCanceled(void* task);
   void asyncTaskStarted(void* task);
   void asyncTaskFinished(void* task);