Fix ProfileCode ticking and add unit test

runtime/vm/profiler_service.h

 // Copyright (c) 2015, 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.
 
 #ifndef VM_PROFILER_SERVICE_H_
 #define VM_PROFILER_SERVICE_H_
 
 #include "vm/allocation.h"
 #include "vm/code_observers.h"
 #include "vm/globals.h"
@@ skipping 331 matching lines @@
       : profile_(profile),
         parent_(NULL),
         current_(NULL),
         code_trie_(false) {
     ASSERT(profile_ != NULL);
   }
 
   void Reset(Profile::TrieKind trie_kind);
 
   const char* CurrentName();
+  // Return the current node's peer's inclusive tick count.
+  intptr_t CurrentInclusiveTicks();
+  // Return the current node's peer's exclusive tick count.
+  intptr_t CurrentExclusiveTicks();
+  // Return the current node's tick count.
+  intptr_t CurrentNodeTickCount();
 
   bool Down();
   bool NextSibling();
 
  private:
   Profile* profile_;
   ProfileTrieNode* parent_;
   ProfileTrieNode* current_;
   bool code_trie_;
 };
@@ skipping 13 matching lines @@
  private:
   static void PrintJSONImpl(Isolate* isolate,
                             JSONStream* stream,
                             Profile::TagOrder tag_order,
                             SampleFilter* filter);
 };
 
 }  // namespace dart
 
 #endif  // VM_PROFILER_SERVICE_H_