Import Dart bindings as of Blink r188698. This merely copies the files over and does not attach any…

sky/engine/bindings-dart/core/dart/DartGCController.h

Index: sky/engine/bindings-dart/core/dart/DartGCController.h
diff --git a/sky/engine/platform/exported/Platform.cpp b/sky/engine/bindings-dart/core/dart/DartGCController.h
similarity index 83%
copy from sky/engine/platform/exported/Platform.cpp
copy to sky/engine/bindings-dart/core/dart/DartGCController.h
index 61872fbe9498df012e4da6f4c859fd8ac76a8b4d..3d13db757e31994b1747ecbecfc3b6f80fb28c93 100644
--- a/sky/engine/platform/exported/Platform.cpp
+++ b/sky/engine/bindings-dart/core/dart/DartGCController.h
@@ -28,26 +28,20 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "sky/engine/config.h"
-#include "sky/engine/public/platform/Platform.h"
+#ifndef DartGCController_h
+#define DartGCController_h
 
-namespace blink {
-
-static Platform* s_platform = 0;
+#include <dart_api.h>
 
-void Platform::initialize(Platform* platform)
-{
-    s_platform = platform;
-}
+namespace blink {
 
-void Platform::shutdown()
-{
-    s_platform = 0;
-}
+class DartGCController {
+public:
+    static void prologueCallback();
+    static void epilogueCallback();
+    static void prologueWeakHandleCallback(void*, Dart_WeakPersistentHandle, intptr_t, intptr_t*);
+};
 
-Platform* Platform::current()
-{
-    return s_platform;
 }
 
-} // namespace blink
+#endif // DartGCController_h