Add information about memory allocator's size and capacity and heap snapshot into heap stats.

src/v8.h

Index: src/v8.h
diff --git a/src/v8.h b/src/v8.h
index 966d5a9d2fdd5f3baae240c2440fc95fcda886fa..f761d3812f31124d2ffaf303c924a1dfcbe3214c 100644
--- a/src/v8.h
+++ b/src/v8.h
@@ -92,7 +92,8 @@ class V8 : public AllStatic {
   static void SetFatalError();
 
   // Report process out of memory. Implementation found in api.cc.
-  static void FatalProcessOutOfMemory(const char* location);
+  static void FatalProcessOutOfMemory(const char* location,
+                                      bool take_snapshot = false);
 
   // Random number generation support. Not cryptographically safe.
   static uint32_t Random();