Adds CPU message type to vm service.

runtime/vm/service.cc

Index: runtime/vm/service.cc
===================================================================
--- runtime/vm/service.cc	(revision 31022)
+++ runtime/vm/service.cc	(working copy)
@@ -2,6 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+#include "vm/cpu.h"
 #include "vm/debugger.h"
 #include "vm/heap_histogram.h"
 #include "vm/isolate.h"
@@ -254,14 +255,23 @@
 }
 
 
+static void HandleCpu(Isolate* isolate, JSONStream* js) {
+  JSONObject jsobj(js);
+  jsobj.AddProperty("type", "CPU");
+  jsobj.AddProperty("architecture", CPU::Id());
+}
+
+
+// Alphabetical order.
 static ServiceMessageHandlerEntry __message_handlers[] = {
+  { "_echo", HandleEcho },
+  { "classes", HandleClasses },
+  { "cpu", HandleCpu },
+  { "library", HandleLibrary },
   { "name", HandleName },
-  { "stacktrace", HandleStackTrace },
   { "objecthistogram", HandleObjectHistogram},
-  { "library", HandleLibrary },
-  { "classes", HandleClasses },
   { "objects", HandleObjects },
-  { "_echo", HandleEcho },
+  { "stacktrace", HandleStackTrace },
 };