[inspector] use creation stack trace as parent for async call chains

src/inspector/v8-debugger.cc

Index: src/inspector/v8-debugger.cc
diff --git a/src/inspector/v8-debugger.cc b/src/inspector/v8-debugger.cc
index f65b590b04cf4979036a40af5a309efeeaa96065..ab5da269a96d7bec46a93f08431d4a6f330b1f97 100644
--- a/src/inspector/v8-debugger.cc
+++ b/src/inspector/v8-debugger.cc
@@ -683,12 +683,15 @@ void V8Debugger::PromiseEventOccurred(v8::debug::PromiseDebugActionType type,
 }
 
 std::shared_ptr<AsyncStackTrace> V8Debugger::currentAsyncParent() {
+  // TODO(kozyatinskiy): implement creation chain as parent without hack.
+  if (!m_currentAsyncCreation.empty() && m_currentAsyncCreation.back()) {
+    return m_currentAsyncCreation.back();
+  }
   return m_currentAsyncParent.empty() ? nullptr : m_currentAsyncParent.back();
 }
 
 std::shared_ptr<AsyncStackTrace> V8Debugger::currentAsyncCreation() {
-  return m_currentAsyncCreation.empty() ? nullptr
-                                        : m_currentAsyncCreation.back();
+  return nullptr;
 }
 
 void V8Debugger::compileDebuggerScript() {
@@ -856,7 +859,8 @@ void V8Debugger::asyncTaskCreatedForStack(void* task, void* parentTask) {
   if (parentTask) m_parentTask[task] = parentTask;
   v8::HandleScope scope(m_isolate);
   std::shared_ptr<AsyncStackTrace> asyncCreation =
-      AsyncStackTrace::capture(this, currentContextGroupId(), String16(), 1);
+      AsyncStackTrace::capture(this, currentContextGroupId(), String16(),
+                               V8StackTraceImpl::maxCallStackSizeToCapture);
   // Passing one as maxStackSize forces no async chain for the new stack.
   if (asyncCreation && !asyncCreation->isEmpty()) {
     m_asyncTaskCreationStacks[task] = asyncCreation;
@@ -932,6 +936,11 @@ void V8Debugger::asyncTaskStartedForStack(void* task) {
   auto itCreation = m_asyncTaskCreationStacks.find(task);
   if (itCreation != m_asyncTaskCreationStacks.end()) {
     m_currentAsyncCreation.push_back(itCreation->second.lock());
+    // TODO(kozyatinskiy): implement it without hack.
+    if (m_currentAsyncParent.back()) {
+      m_currentAsyncCreation.back()->setDescription(
+          m_currentAsyncParent.back()->description());

[dgozman, 2017/05/05 23:24:31]

Also clear m_currentAsyncParent.back().

[kozy, 2017/05/09 06:29:13]

Done.

+    }
   } else {
     m_currentAsyncCreation.emplace_back();
   }