Add missing entry points called by the embedding API's implementation.

runtime/vm/precompiler.cc

Index: runtime/vm/precompiler.cc
diff --git a/runtime/vm/precompiler.cc b/runtime/vm/precompiler.cc
index 7182f80921fed13df4ecbb7bb2e026786c46460c..d0c46683b04dd502d763e1194c565f6a36e523cf 100644
--- a/runtime/vm/precompiler.cc
+++ b/runtime/vm/precompiler.cc
@@ -230,6 +230,9 @@ void Precompiler::AddRoots(Dart_QualifiedFunctionName embedder_entry_points[]) {
     { "dart:isolate", "_RawReceivePortImpl", "_handleMessage" },
     { "dart:isolate", "_RawReceivePortImpl", "_lookupHandler" },
     { "dart:isolate", "_SendPortImpl", "send" },
+    { "dart:typed_data", "ByteData", "ByteData." },
+    { "dart:typed_data", "ByteData", "ByteData._view" },
+    { "dart:typed_data", "_ByteBuffer", "_ByteBuffer._New" },

[Florian Schneider, 2015/10/26 10:14:01]

Since these are specific to each embedder and may change, wouldn't it make sense
to pass vm_entry_points as a command-line argument in a file to the precompiler?

[rmacnak, 2015/10/26 16:09:35]

There are two lists, one for the VM which is hard-coded here and one for the
embedder which is an argument to Dart_Precompile. The standalone embedder's list
is in bin/main.cc. Chinmay has also added an argument to gen_snapshot to pass
embedder entry points via a file. Because these functions are invoked implicitly
by Dart_New[External]TypedData, I think they belong on the VM list.

     { "dart:vmservice", "::", "_registerIsolate" },
     { "dart:vmservice", "::", "boot" },
     { NULL, NULL, NULL }  // Must be terminated with NULL entries.