Update four callers of Message constructor to pass in required arguments

examples/raw/hello_world.dart

@@ -54,7 +54,8 @@ void handleEvent(String eventType, double timeStamp) {
 
 void handlePointerPacket(ByteData serializedPacket) {
   bindings.Message message = new bindings.Message(
-      serializedPacket, <core.MojoHandle>[]);
+      serializedPacket, <core.MojoHandle>[],
+      serializedPacket.lengthInBytes, 0);
   PointerPacket packet = PointerPacket.deserialize(message);
 
   for (Pointer pointer in packet.pointers) {

examples/raw/spinning_image.dart

@@ -83,7 +83,8 @@ void handleImageLoad(result) {
 
 void handlePointerPacket(ByteData serializedPacket) {
   bindings.Message message = new bindings.Message(
-      serializedPacket, <core.MojoHandle>[]);
+      serializedPacket, <core.MojoHandle>[],
+      serializedPacket.lengthInBytes, 0);
   PointerPacket packet = PointerPacket.deserialize(message);
 
   for (Pointer pointer in packet.pointers) {

examples/rendering/interactive_flex.dart

@@ -47,7 +47,9 @@ final Map<int, Touch> touches = <int, Touch>{};
 void handlePointerPacket(ByteData serializedPacket) {
   bindings.Message message = new bindings.Message(
     serializedPacket,
-    <core.MojoHandle>[]
+    <core.MojoHandle>[],
+    serializedPacket.lengthInBytes,
+    0
   );
   PointerPacket packet = PointerPacket.deserialize(message);
 

packages/flutter/lib/src/rendering/binding.dart

@@ -212,7 +212,10 @@ class FlutterBinding extends HitTestTarget {
 
   void _handlePointerPacket(ByteData serializedPacket) {
     bindings.Message message = new bindings.Message(
-        serializedPacket, <core.MojoHandle>[]);
+        serializedPacket,
+        <core.MojoHandle>[],
+        serializedPacket.lengthInBytes,
+        0);
     PointerPacket packet = PointerPacket.deserialize(message);
     for (PointerInputEvent event in _PointerEventConverter.convertPointerPacket(packet)) {
       _handlePointerInputEvent(event);