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

Source/bindings/dart/DartScriptState.cpp

Index: Source/bindings/dart/DartScriptState.cpp
diff --git a/Source/core/html/ime/Composition.cpp b/Source/bindings/dart/DartScriptState.cpp
similarity index 78%
copy from Source/core/html/ime/Composition.cpp
copy to Source/bindings/dart/DartScriptState.cpp
index 9b40000a5b2e93b16c5edd9c93f8575f4e797e57..544b6531edf0b2dbdaf3130263896b1a29a7100b 100644
--- a/Source/core/html/ime/Composition.cpp
+++ b/Source/bindings/dart/DartScriptState.cpp
@@ -29,29 +29,21 @@
  */
 
 #include "config.h"
-#include "core/html/ime/Composition.h"
 
-namespace WebCore {
+#include "bindings/dart/DartScriptState.h"
 
-Composition::~Composition()
-{
-}
+#include "bindings/dart/DartUtilities.h"
+#include <dart_debugger_api.h>
 
-PassRefPtr<Composition> Composition::create()
-{
-    return adoptRef(new Composition());
-}
+namespace WebCore {
 
-Composition::Composition()
-    : m_selectionStart(0)
-    , m_selectionEnd(0)
+DartScriptState::DartScriptState(Dart_Isolate isolate, intptr_t libraryId, v8::Handle<v8::Context> context) : ScriptState(context)
 {
-    ScriptWrappable::init(this);
+    m_isolate = isolate;
+    m_libraryId = libraryId;
+    Dart_Handle exception = 0;
+    m_libraryUrl = DartUtilities::dartToString(Dart_GetLibraryURL(libraryId), exception);
+    ASSERT(!exception);
 }
 
-const Vector<unsigned>& Composition::getSegments() const
-{
-    return m_segments;
 }
-
-} // namespace WebCore