Add a few tests to ProfilerEventsProcessor.

src/profile-generator.h

Index: src/profile-generator.h
diff --git a/src/profile-generator.h b/src/profile-generator.h
index a16ea66f710dd75124dd90a08ed46f8f066c74ed..c0454cb821f6902b35f7e480023d2fab0bdd07e1 100644
--- a/src/profile-generator.h
+++ b/src/profile-generator.h
@@ -64,9 +64,10 @@ class ProfileNode {
   INLINE(void IncrementSelfTicks()) { ++self_ticks_; }
   INLINE(void IncreaseTotalTicks(unsigned amount)) { total_ticks_ += amount; }
 
-  INLINE(CodeEntry* entry()) { return entry_; }
-  INLINE(unsigned total_ticks()) { return total_ticks_; }
-  INLINE(unsigned self_ticks()) { return self_ticks_; }
+  INLINE(CodeEntry* entry() const) { return entry_; }
+  INLINE(unsigned total_ticks() const) { return total_ticks_; }
+  INLINE(unsigned self_ticks() const) { return self_ticks_; }
+  void GetChildren(List<ProfileNode*>* children);
 
   void Print(int indent);