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

Source/bindings/dart/DartInjectedScriptHost.h

Index: Source/bindings/dart/DartInjectedScriptHost.h
diff --git a/Source/bindings/dart/custom/DartWorkerCryptoCustom.cpp b/Source/bindings/dart/DartInjectedScriptHost.h
similarity index 84%
copy from Source/bindings/dart/custom/DartWorkerCryptoCustom.cpp
copy to Source/bindings/dart/DartInjectedScriptHost.h
index 9cf8e518bf09078d0f6f9a1d1e8b8fc338cbe95d..8bd8cfc71eaf98f933f544f3b5eb8edd63b2eddb 100644
--- a/Source/bindings/dart/custom/DartWorkerCryptoCustom.cpp
+++ b/Source/bindings/dart/DartInjectedScriptHost.h
@@ -27,19 +27,18 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#include "config.h"
-#include "DartWorkerCrypto.h"
+#ifndef DartInjectedScriptHost_h
+#define DartInjectedScriptHost_h
 
-namespace WebCore {
+#include <v8.h>
 
-namespace DartWorkerCryptoInternal {
+namespace WebCore {
 
-void getRandomValuesCallback(Dart_NativeArguments)
-{
-    // FIXME: proper implementation.
-    DART_UNIMPLEMENTED();
-}
+class DartInjectedScriptHost {
+public:
+    static v8::Handle<v8::Value> evaluateIfDartContext(v8::Handle<v8::Object> v8InjectedScriptHost, v8::Handle<v8::String> expression);
+};
 
 }
 
-}
+#endif // DartInjectedScriptHost_h