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

sky/engine/bindings-dart/core/dart/custom/DartMessageChannelCustom.cpp

Index: sky/engine/bindings-dart/core/dart/custom/DartMessageChannelCustom.cpp
diff --git a/LICENSE b/sky/engine/bindings-dart/core/dart/custom/DartMessageChannelCustom.cpp
similarity index 84%
copy from LICENSE
copy to sky/engine/bindings-dart/core/dart/custom/DartMessageChannelCustom.cpp
index 972bb2edb099e58b6a1939fa57f8e74391159c0c..6499563b807510cf2e0b94a187a1035ed8e0f4e7 100644
--- a/LICENSE
+++ b/sky/engine/bindings-dart/core/dart/custom/DartMessageChannelCustom.cpp
@@ -1,4 +1,5 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
+// Copyright 2012, 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
@@ -25,3 +26,19 @@
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (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 "bindings/core/dart/DartMessageChannel.h"
+
+namespace blink {
+
+namespace DartMessageChannelInternal {
+
+void constructorCallback(Dart_NativeArguments args)
+{
+    DART_UNIMPLEMENTED();
+}
+
+}
+
+}