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

runtime/vm/dart.cc

Index: runtime/vm/dart.cc
===================================================================
--- runtime/vm/dart.cc	(revision 18152)
+++ runtime/vm/dart.cc	(working copy)
@@ -7,6 +7,7 @@
 #include "vm/code_observers.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
+#include "vm/debugger.h"
 #include "vm/flags.h"
 #include "vm/freelist.h"
 #include "vm/handles.h"
@@ -98,6 +99,7 @@
 #if defined(USING_SIMULATOR)
   Simulator::InitOnce();
 #endif
+  VmStatusService::InitOnce();

[siva, 2013/02/09 01:00:57]

I guess this InitOnce is needed to for the plug-in registration and the map that
you maintain for supporting that. We need to discuss about the need for external
entities registering their plugins with the VM.

[Tom Ball, 2013/02/14 23:45:16]

That's right -- I can lazily do initialization on first request, if that's
preferable.

   // Create the read-only handles area.
   ASSERT(predefined_handles_ == NULL);
   predefined_handles_ = new ReadOnlyHandles();