Model each Dart library as its own ScriptState when devtools are enabled.

Source/bindings/dart/DartController.h

Index: Source/bindings/dart/DartController.h
diff --git a/Source/bindings/dart/DartController.h b/Source/bindings/dart/DartController.h
index 5cd255fb0b7a0aadf1f8cde069562e6156d85982..504c69a36b6b048d7c81c153f4962e2a0dc51ab6 100644
--- a/Source/bindings/dart/DartController.h
+++ b/Source/bindings/dart/DartController.h
@@ -44,9 +44,11 @@ namespace WebCore {
 
 class DartApplicationLoader;
 class DartDOMData;
+class DartScriptState;
 class DOMWindow;
 class Frame;
 class ScriptExecutionContext;
+class ScriptState;
 
 // This class provides the linkage between a Frame and its attached
 // Dart isolates. It is similar to ScriptController for JavaScript.
@@ -70,6 +72,8 @@ public:
     void startDart();
 
     Frame* frame() const { return m_frame; }
+    void collectScriptStates(ScriptState* v8ScriptState, Vector<ScriptState*>& result);
+    void collectScriptStatesForIsolate(Dart_Isolate, v8::Handle<v8::Context> v8Context, Vector<ScriptState*>& result);
 
     void spawnDomIsolateFromSelf(const String& libraryUrl, const String& entryPoint, DartDOMData* parentDOMData, Dart_Port replyTo);
     void spawnDomIsolateFromUrl(const String& url, Dart_Port replyTo);
@@ -101,6 +105,10 @@ private:
     // Isolates associated with scripts in this document.
     Vector<Dart_Isolate> m_isolates;
 
+    typedef HashMap<intptr_t, DartScriptState*> LibraryIdMap;
+    typedef HashMap<Dart_Isolate, LibraryIdMap*> ScriptStatesMap;
+    ScriptStatesMap m_scriptStates;
+
     typedef HashMap<String, NPObject*> NPObjectMap;
     NPObjectMap m_npObjectMap;