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 19079)
+++ runtime/vm/debugger_api_impl.cc	(working copy)
@@ -751,4 +751,12 @@
   return Api::CastIsolate(isolate);
 }
 
+
+DART_EXPORT char* Dart_GetVmStatus(const char* request) {
+  if (strncmp(request, "/isolate/", 9) == 0) {
+    return Isolate::GetStatus(request);
+  }
+  return NULL;
+}
+
 }  // namespace dart