[inspector] added creation frame for async call chains for promises

src/inspector/v8-stack-trace-impl.cc

Index: src/inspector/v8-stack-trace-impl.cc
diff --git a/src/inspector/v8-stack-trace-impl.cc b/src/inspector/v8-stack-trace-impl.cc
index 962a00a773ded450312a8c5005601178c0773f76..feb763cd664539cd3c93b3336773e7cf999c1114 100644
--- a/src/inspector/v8-stack-trace-impl.cc
+++ b/src/inspector/v8-stack-trace-impl.cc
@@ -141,16 +141,33 @@ std::unique_ptr<V8StackTraceImpl> V8StackTraceImpl::create(
     maxAsyncCallChainDepth = 1;
   }
 
-  // Only the top stack in the chain may be empty, so ensure that second stack
-  // is non-empty (it's the top of appended chain).
-  if (asyncCallChain && asyncCallChain->isEmpty())
+  // Only the top stack in the chain may be empty and doesn't contain creation
+  // stack , so ensure that second stack is non-empty (it's the top of appended
+  // chain).
+  if (asyncCallChain && asyncCallChain->isEmpty() &&
+      !asyncCallChain->m_creation) {
     asyncCallChain = asyncCallChain->m_parent.get();
+  }
+
+  // When async call chain is empty but doesn't contain useful schedule stack
+  // and
+  // parent async call chain contains creationg stack but doesn't synchronous we
+  // can merge them together.
+  // e.g. Promise ThenableJob.
+  if (asyncCallChain && asyncCallChain->isEmpty() && asyncCallChain->m_parent) {
+    if (asyncCallChain->m_creation && asyncCallChain->isEmpty() &&
+        !asyncCallChain->m_parent->m_creation) {
+      asyncCallChain->m_parent->m_creation =
+          std::move(asyncCallChain->m_creation);
+      asyncCallChain = asyncCallChain->m_parent.get();
+    }
+  }
 
   if (stackTrace.IsEmpty() && !asyncCallChain) return nullptr;
 
   std::unique_ptr<V8StackTraceImpl> result(new V8StackTraceImpl(
       contextGroupId, description, frames,
-      asyncCallChain ? asyncCallChain->cloneImpl() : nullptr));
+      asyncCallChain ? asyncCallChain->cloneImpl() : nullptr, nullptr));
 
   // Crop to not exceed maxAsyncCallChainDepth.
   V8StackTraceImpl* deepest = result.get();
@@ -182,24 +199,27 @@ std::unique_ptr<V8StackTraceImpl> V8StackTraceImpl::cloneImpl() {
   std::vector<Frame> framesCopy(m_frames);
   return std::unique_ptr<V8StackTraceImpl>(
       new V8StackTraceImpl(m_contextGroupId, m_description, framesCopy,
-                           m_parent ? m_parent->cloneImpl() : nullptr));
+                           m_parent ? m_parent->cloneImpl() : nullptr,
+                           m_creation ? m_creation->cloneImpl() : nullptr));
 }
 
 std::unique_ptr<V8StackTrace> V8StackTraceImpl::clone() {
   std::vector<Frame> frames;
   for (size_t i = 0; i < m_frames.size(); i++)
     frames.push_back(m_frames.at(i).clone());
-  return std::unique_ptr<V8StackTraceImpl>(
-      new V8StackTraceImpl(m_contextGroupId, m_description, frames, nullptr));
+  return std::unique_ptr<V8StackTraceImpl>(new V8StackTraceImpl(
+      m_contextGroupId, m_description, frames, nullptr, nullptr));
 }
 
 V8StackTraceImpl::V8StackTraceImpl(int contextGroupId,
                                    const String16& description,
                                    std::vector<Frame>& frames,
-                                   std::unique_ptr<V8StackTraceImpl> parent)
+                                   std::unique_ptr<V8StackTraceImpl> parent,
+                                   std::unique_ptr<V8StackTraceImpl> creation)
     : m_contextGroupId(contextGroupId),
       m_description(description),
-      m_parent(std::move(parent)) {
+      m_parent(std::move(parent)),
+      m_creation(std::move(creation)) {
   m_frames.swap(frames);
 }
 
@@ -243,6 +263,10 @@ V8StackTraceImpl::buildInspectorObjectImpl() const {
           .build();
   if (!m_description.isEmpty()) stackTrace->setDescription(m_description);
   if (m_parent) stackTrace->setParent(m_parent->buildInspectorObjectImpl());
+  if (m_creation && m_creation->m_frames.size()) {
+    stackTrace->setPromiseCreationFrame(
+        m_creation->m_frames[0].buildInspectorObject());
+  }
   return stackTrace;
 }