DevTools: disable DOMDebuggerAgent when DOMAgent or DebuggerAgent were disabled.

Source/core/inspector/InspectorDOMDebuggerAgent.cpp

Index: Source/core/inspector/InspectorDOMDebuggerAgent.cpp
diff --git a/Source/core/inspector/InspectorDOMDebuggerAgent.cpp b/Source/core/inspector/InspectorDOMDebuggerAgent.cpp
index 60701d59dc35a67dd6f55be30c3e767c621f2028..bedc03bd1118731b97098b3c9adefeb3f952cb9a 100644
--- a/Source/core/inspector/InspectorDOMDebuggerAgent.cpp
+++ b/Source/core/inspector/InspectorDOMDebuggerAgent.cpp
@@ -85,6 +85,7 @@ InspectorDOMDebuggerAgent::InspectorDOMDebuggerAgent(InspectorDOMAgent* domAgent
     , m_pauseInNextEventListener(false)
 {
     m_debuggerAgent->setListener(this);
+    m_domAgent->setListener(this);
 }
 
 InspectorDOMDebuggerAgent::~InspectorDOMDebuggerAgent()
@@ -96,7 +97,8 @@ InspectorDOMDebuggerAgent::~InspectorDOMDebuggerAgent()
 // Browser debugger agent enabled only when JS debugger is enabled.
 void InspectorDOMDebuggerAgent::debuggerWasEnabled()
 {
-    m_instrumentingAgents->setInspectorDOMDebuggerAgent(this);
+    if (m_domAgent->enabled() && m_debuggerAgent->enabled())
+        m_instrumentingAgents->setInspectorDOMDebuggerAgent(this);
 }
 
 void InspectorDOMDebuggerAgent::debuggerWasDisabled()
@@ -104,6 +106,17 @@ void InspectorDOMDebuggerAgent::debuggerWasDisabled()
     disable();
 }
 
+void InspectorDOMDebuggerAgent::domAgentWasEnabled()
+{
+    if (m_domAgent->enabled() && m_debuggerAgent->enabled())
+        m_instrumentingAgents->setInspectorDOMDebuggerAgent(this);
+}
+
+void InspectorDOMDebuggerAgent::domAgentWasDisabled()
+{
+    disable();
+}
+
 void InspectorDOMDebuggerAgent::stepInto()
 {
     m_pauseInNextEventListener = true;