DevTools: Don't stop debugger inside V8 internal scripts with empty stack trace.

Source/core/inspector/InspectorDebuggerAgent.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 1279 matching lines @@
         breakpointObject->getString(DebuggerAgentState::condition, &breakpoint.condition);
         RefPtr<TypeBuilder::Debugger::Location> location = resolveBreakpoint(it->key, scriptId, breakpoint, UserBreakpointSource);
         if (location)
             m_frontend->breakpointResolved(it->key, location);
     }
 }
 
 ScriptDebugListener::SkipPauseRequest InspectorDebuggerAgent::didPause(ScriptState* scriptState, const ScriptValue& callFrames, const ScriptValue& exception, const Vector<String>& hitBreakpoints)
 {
     ScriptDebugListener::SkipPauseRequest result;
-    if (m_javaScriptPauseScheduled)
+    if (callFrames.isEmpty())
+        result = ScriptDebugListener::Continue; // Skip pauses inside V8 internal scripts and on syntax errors.
+    else if (m_javaScriptPauseScheduled)
         result = ScriptDebugListener::NoSkip; // Don't skip explicit pause requests from front-end.
     else if (m_skipAllPauses)
         result = ScriptDebugListener::Continue;
     else if (!hitBreakpoints.isEmpty())
         result = ScriptDebugListener::NoSkip; // Don't skip explicit breakpoints even if set in frameworks.
     else if (!exception.isEmpty())
         result = shouldSkipExceptionPause();
     else if (m_debuggerStepScheduled || m_pausingOnNativeEvent)
         result = shouldSkipStepPause();
     else
@@ skipping 125 matching lines @@
 
 void InspectorDebuggerAgent::trace(Visitor* visitor)
 {
     visitor->trace(m_injectedScriptManager);
     visitor->trace(m_listener);
     InspectorBaseAgent::trace(visitor);
 }
 
 } // namespace blink