Initial prototype of vmstats support, based on Dart VM Stats draft design doc.

runtime/vm/debugger_api_impl.cc

Index: runtime/vm/debugger_api_impl.cc
===================================================================
--- runtime/vm/debugger_api_impl.cc	(revision 18152)
+++ runtime/vm/debugger_api_impl.cc	(working copy)
@@ -751,4 +751,15 @@
   return Api::CastIsolate(isolate);
 }
 
+
+DART_EXPORT char* Dart_GetVmStatus(const char* request) {
+  return VmStatusService::Dart_GetVmStatus(request);
+}
+
+
+DART_EXPORT Dart_Handle Dart_RegisterVmStatusPlugin(
+    const char* status_type, Dart_VmStatusCallback callback) {
+  return VmStatusService::RegisterPlugin(status_type, callback);
+}
+
 }  // namespace dart