DevTools: do not enable debugger for pages where script execution is prohibited

Source/core/inspector/PageDebuggerAgent.cpp

 /*
  * Copyright (C) 2011 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 54 matching lines @@
 }
 
 DEFINE_TRACE(PageDebuggerAgent)
 {
     visitor->trace(m_pageScriptDebugServer);
     visitor->trace(m_pageAgent);
     visitor->trace(m_overlay);
     InspectorDebuggerAgent::trace(visitor);
 }
 
+bool PageDebuggerAgent::canExecuteScripts() const
+{
+    ScriptController& scriptController = m_pageAgent->inspectedFrame()->script();
+    return scriptController.canExecuteScripts(NotAboutToExecuteScript);
+}
+
+void PageDebuggerAgent::enable(ErrorString* errorString)
+{
+    if (!canExecuteScripts()) {
+        *errorString = "Script execution is prohibited";
+        return;
+    }
+    InspectorDebuggerAgent::enable(errorString);
+}
+
 void PageDebuggerAgent::enable()
 {
+    ASSERT(canExecuteScripts());
     InspectorDebuggerAgent::enable();
     m_instrumentingAgents->setPageDebuggerAgent(this);
 }
 
 void PageDebuggerAgent::disable()
 {
     InspectorDebuggerAgent::disable();
     m_instrumentingAgents->setPageDebuggerAgent(0);
 }
 
@@ skipping 64 matching lines @@
         return;
     reset();
 }
 
 void PageDebuggerAgent::didCommitLoadForLocalFrame(LocalFrame*)
 {
     resetModifiedSources();
 }
 
 } // namespace blink