[inspector] introduced Debugger.scheduleStepIntoAsync

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

Index: src/inspector/v8-debugger-agent-impl.h
diff --git a/src/inspector/v8-debugger-agent-impl.h b/src/inspector/v8-debugger-agent-impl.h
index e4de9b3f0c527c53aa5f07ed55e337e5fca3fd65..37e92099f8c2c32e28def0c86da8f74e535f509e 100644
--- a/src/inspector/v8-debugger-agent-impl.h
+++ b/src/inspector/v8-debugger-agent-impl.h
@@ -88,6 +88,8 @@ class V8DebuggerAgentImpl : public protocol::Debugger::Backend {
   Response stepOver() override;
   Response stepInto() override;
   Response stepOut() override;
+  void scheduleStepIntoAsync(
+      std::unique_ptr<ScheduleStepIntoAsyncCallback> callback) override;
   Response setPauseOnExceptions(const String16& pauseState) override;
   Response evaluateOnCallFrame(
       const String16& callFrameId, const String16& expression,
@@ -143,6 +145,8 @@ class V8DebuggerAgentImpl : public protocol::Debugger::Backend {
 
   v8::Isolate* isolate() { return m_isolate; }
 
+  bool shouldBreakInScheduledAsyncTask();
+
  private:
   void enableImpl();
 
@@ -212,6 +216,8 @@ class V8DebuggerAgentImpl : public protocol::Debugger::Backend {
   protocol::HashMap<String16, std::vector<std::pair<int, int>>>
       m_blackboxedPositions;
 
+  std::unique_ptr<ScheduleStepIntoAsyncCallback> m_stepIntoAsyncCallback;
+
   DISALLOW_COPY_AND_ASSIGN(V8DebuggerAgentImpl);
 };