[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 998d3723caeacb1041aaa1248db6a38ecd76f85b..2a7573c8f5db09e53a04d7d2fcbff00405001f33 100644
--- a/src/inspector/v8-debugger-agent-impl.cc
+++ b/src/inspector/v8-debugger-agent-impl.cc
@@ -458,6 +458,24 @@ bool V8DebuggerAgentImpl::isFunctionBlackboxed(const String16& scriptId,
          std::distance(ranges.begin(), itStartRange) % 2;
 }
 
+void V8DebuggerAgentImpl::asyncTaskCreated() {
+  if (m_scheduledDebuggerStep == StepInto) {
+    breakProgram(protocol::Debugger::Paused::ReasonEnum::CallbackScheduled,
+                 nullptr);
+  }
+}
+
+Response V8DebuggerAgentImpl::stepIntoAsync() {
+  return m_debugger->stepIntoAsync();
+}
+
+void V8DebuggerAgentImpl::asyncTaskStarted() {
+  schedulePauseOnNextStatement(protocol::Debugger::Paused::ReasonEnum::Other,
+                               nullptr);
+}
+
+void V8DebuggerAgentImpl::asyncTaskFinished() { cancelPauseOnNextStatement(); }
+
 std::unique_ptr<protocol::Debugger::Location>
 V8DebuggerAgentImpl::resolveBreakpoint(const String16& breakpointId,
                                        const ScriptBreakpoint& breakpoint,