[debugger] tuned StepNext and StepOut at return position

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

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/inspector/v8-debugger-agent-impl.h"
 
 #include <algorithm>
 
 #include "src/debug/debug-interface.h"
 #include "src/inspector/injected-script.h"
@@ skipping 713 matching lines @@
   if (!isPaused()) return Response::Error(kDebuggerNotPaused);
   m_scheduledDebuggerStep = NoStep;
   m_session->releaseObjectGroup(kBacktraceObjectGroup);
   m_debugger->continueProgram();
   return Response::OK();
 }
 
 Response V8DebuggerAgentImpl::stepOver() {
   if (!isPaused()) return Response::Error(kDebuggerNotPaused);
   // StepOver at function return point should fallback to StepInto.
-  JavaScriptCallFrame* frame =
-      !m_pausedCallFrames.empty() ? m_pausedCallFrames[0].get() : nullptr;
-  if (frame && frame->isAtReturn()) return stepInto();
+  // JavaScriptCallFrame* frame =

[kozy, 2017/03/16 07:19:00]

I can remove it in this CL since we use to step between embedder call, I'll be
able to remove it in followup:
https://codereview.chromium.org/2748503002/

+  //     !m_pausedCallFrames.empty() ? m_pausedCallFrames[0].get() : nullptr;
+  // if (frame && frame->isAtReturn()) return stepInto();
   m_scheduledDebuggerStep = StepOver;
   m_session->releaseObjectGroup(kBacktraceObjectGroup);
   m_debugger->stepOverStatement();
   return Response::OK();
 }
 
 Response V8DebuggerAgentImpl::stepInto() {
   if (!isPaused()) return Response::Error(kDebuggerNotPaused);
   m_scheduledDebuggerStep = StepInto;
   m_session->releaseObjectGroup(kBacktraceObjectGroup);
@@ skipping 596 matching lines @@
 void V8DebuggerAgentImpl::reset() {
   if (!enabled()) return;
   m_scheduledDebuggerStep = NoStep;
   m_blackboxedPositions.clear();
   resetBlackboxedStateCache();
   m_scripts.clear();
   m_breakpointIdToDebuggerBreakpointIds.clear();
 }
 
 }  // namespace v8_inspector