Heap maps: add VM service message.

runtime/vm/service.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // 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/service.h"
 
 #include "include/dart_api.h"
 
 #include "vm/compiler.h"
 #include "vm/coverage.h"
@@ skipping 1253 matching lines @@
 }
 
 
 static bool HandleUnpin(Isolate* isolate, JSONStream* js) {
   // TODO(johnmccutchan): What do I respond with??
   isolate->ClosePinPort();
   return true;
 }
 
 
+static bool HandleHeapMap(Isolate* isolate, JSONStream* js) {
+  isolate->heap()->PrintHeapMapToJSONStream(js);
+  return true;
+}
+
+
 static IsolateMessageHandlerEntry isolate_handlers[] = {
   { "_echo", HandleIsolateEcho },
   { "", HandleIsolate },
   { "allocationprofile", HandleAllocationProfile },
   { "classes", HandleClasses },
   { "code", HandleCode },
   { "coverage", HandleCoverage },
   { "cpu", HandleCpu },
   { "debug", HandleDebug },
+  { "heapmap", HandleHeapMap },
   { "libraries", HandleLibraries },
   { "objects", HandleObjects },
   { "profile", HandleProfile },
   { "unpin", HandleUnpin },
   { "scripts", HandleScripts },
   { "stacktrace", HandleStackTrace },
 };
 
 
 static IsolateMessageHandler FindIsolateMessageHandler(const char* command) {
@@ skipping 205 matching lines @@
   while (current != NULL) {
     if (strcmp(name, current->name()) == 0) {
       return current;
     }
     current = current->next();
   }
   return NULL;
 }
 
 }  // namespace dart