[inspector] introduced stepIntoAsync for chained callbacks

src/inspector/v8-debugger-agent-impl.cc

Index: src/inspector/v8-debugger-agent-impl.cc
diff --git a/src/inspector/v8-debugger-agent-impl.cc b/src/inspector/v8-debugger-agent-impl.cc
index 7de46a1787818170d3e91cd0902a0b2f977ecfcf..98ef28803cd68e2bcde63e9f8af4038eed3101d8 100644
--- a/src/inspector/v8-debugger-agent-impl.cc
+++ b/src/inspector/v8-debugger-agent-impl.cc
@@ -614,14 +614,6 @@ void V8DebuggerAgentImpl::schedulePauseOnNextStatement(
   pushBreakDetails(breakReason, std::move(data));
 }
 
-void V8DebuggerAgentImpl::schedulePauseOnNextStatementIfSteppingInto() {
-  DCHECK(enabled());
-  if (m_scheduledDebuggerStep != StepInto || m_javaScriptPauseScheduled ||
-      isPaused())
-    return;
-  m_debugger->setPauseOnNextStatement(true);
-}
-
 void V8DebuggerAgentImpl::cancelPauseOnNextStatement() {
   if (m_javaScriptPauseScheduled || isPaused()) return;
   popBreakDetails();
@@ -666,6 +658,13 @@ Response V8DebuggerAgentImpl::stepInto() {
   return Response::OK();
 }
 
+Response V8DebuggerAgentImpl::stepIntoAsync() {
+  if (!isPaused()) return Response::Error(kDebuggerNotPaused);
+  m_scheduledDebuggerStep = NoStep;
+  m_session->releaseObjectGroup(kBacktraceObjectGroup);
+  return m_debugger->stepIntoScheduledCallback();
+}
+
 Response V8DebuggerAgentImpl::stepOut() {
   if (!isPaused()) return Response::Error(kDebuggerNotPaused);
   m_scheduledDebuggerStep = StepOut;
@@ -845,8 +844,11 @@ Response V8DebuggerAgentImpl::setBlackboxedRanges(
 
 void V8DebuggerAgentImpl::willExecuteScript(int scriptId) {
   changeJavaScriptRecursionLevel(+1);
-  if (m_scheduledDebuggerStep != StepInto) return;
-  schedulePauseOnNextStatementIfSteppingInto();
+  if (m_scheduledDebuggerStep != StepInto || m_javaScriptPauseScheduled ||
+      isPaused()) {
+    return;
+  }
+  m_debugger->setPauseOnNextStatement(true);
 }
 
 void V8DebuggerAgentImpl::didExecuteScript() {
@@ -1158,6 +1160,11 @@ void V8DebuggerAgentImpl::didPause(int contextId,
     breakAuxData->setArray("reasons", std::move(reasons));
   }
 
+  if (m_debugger->stepIntoScheduledCallbackAvailable()) {
+    if (!breakAuxData) breakAuxData = protocol::DictionaryValue::create();
+    breakAuxData->setBoolean("stepIntoAsyncAvailable", true);
+  }
+
   std::unique_ptr<Array<CallFrame>> protocolCallFrames;
   Response response = currentCallFrames(&protocolCallFrames);
   if (!response.isSuccess()) protocolCallFrames = Array<CallFrame>::create();
@@ -1193,6 +1200,13 @@ void V8DebuggerAgentImpl::breakProgram(
   m_breakReason.swap(currentScheduledReason);
 }
 
+void V8DebuggerAgentImpl::breakProgramIfSteppingInto(
+    const String16& breakReason,
+    std::unique_ptr<protocol::DictionaryValue> data) {
+  if (m_scheduledDebuggerStep != StepInto) return;
+  breakProgram(breakReason, std::move(data));
+}
+
 void V8DebuggerAgentImpl::breakProgramOnException(
     const String16& breakReason,
     std::unique_ptr<protocol::DictionaryValue> data) {