Fix devtools bugs Fix a spurious layout test failure

Source/core/inspector/InspectorDebuggerAgent.cpp

Index: Source/core/inspector/InspectorDebuggerAgent.cpp
diff --git a/Source/core/inspector/InspectorDebuggerAgent.cpp b/Source/core/inspector/InspectorDebuggerAgent.cpp
index 774575e842fe6634f2281e0bd9d638248789dad3..4c8307697e6e122075230ca3ce30a7eed1f67033 100644
--- a/Source/core/inspector/InspectorDebuggerAgent.cpp
+++ b/Source/core/inspector/InspectorDebuggerAgent.cpp
@@ -196,6 +196,9 @@ bool InspectorDebuggerAgent::checkEnabled(ErrorString* errorString)
 
 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.
@@ -209,6 +212,9 @@ void InspectorDebuggerAgent::enable()
 
 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, "");