Fix devtools bugs Fix a spurious layout test failure

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 178 matching lines @@
 bool InspectorDebuggerAgent::checkEnabled(ErrorString* errorString)
 {
     if (enabled())
         return true;
     *errorString = "Debugger agent is not enabled";
     return false;
 }
 
 void InspectorDebuggerAgent::enable()
 {
+    if (dartAgent())
+        dartAgent()->enable(0);
+
     m_instrumentingAgents->setInspectorDebuggerAgent(this);
     // startListeningV8Debugger may result in reporting all parsed scripts to
     // the agent so it should already be in enabled state by then.
     m_state->setBoolean(DebuggerAgentState::debuggerEnabled, true);
     startListeningV8Debugger();
     // FIXME(WK44513): breakpoints activated flag should be synchronized between all front-ends
     debugger().setBreakpointsActivated(true);
     if (m_listener)
         m_listener->debuggerWasEnabled();
 }
 
 void InspectorDebuggerAgent::disable()
 {
+    if (dartAgent())
+        dartAgent()->disable(0);
+
     m_state->setObject(DebuggerAgentState::javaScriptBreakpoints, JSONObject::create());
     m_state->setLong(DebuggerAgentState::pauseOnExceptionsState, V8Debugger::DontPauseOnExceptions);
     m_state->setString(DebuggerAgentState::skipStackPattern, "");
     m_state->setBoolean(DebuggerAgentState::skipContentScripts, false);
     m_state->setLong(DebuggerAgentState::asyncCallStackDepth, 0);
     m_state->setBoolean(DebuggerAgentState::promiseTrackerEnabled, false);
     m_instrumentingAgents->setInspectorDebuggerAgent(0);
 
     stopListeningV8Debugger();
     clear();
@@ skipping 1663 matching lines @@
     RefPtr<ExceptionDetails> exceptionDetails = ExceptionDetails::create().setText(toCoreStringWithUndefinedOrNullCheck(message->Get()));
     exceptionDetails->setLine(message->GetLineNumber());
     exceptionDetails->setColumn(message->GetStartColumn());
     v8::Local<v8::StackTrace> messageStackTrace = message->GetStackTrace();
     if (!messageStackTrace.IsEmpty() && messageStackTrace->GetFrameCount() > 0)
         exceptionDetails->setStackTrace(createScriptCallStack(isolate, messageStackTrace, messageStackTrace->GetFrameCount())->buildInspectorArray());
     return exceptionDetails.release();
 }
 
 } // namespace blink