[profiler] Add CodeEvent entries for RCS counters statically on profiler start.

src/counters.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COUNTERS_H_
 #define V8_COUNTERS_H_
 
 #include "include/v8.h"
 #include "src/allocation.h"
 #include "src/base/atomic-utils.h"
@@ skipping 817 matching lines @@
 #define CALL_BUILTIN_COUNTER(name) \
   RuntimeCallCounter API_##name = RuntimeCallCounter("API_" #name);
   FOR_EACH_API_COUNTER(CALL_BUILTIN_COUNTER)
 #undef CALL_BUILTIN_COUNTER
 #define CALL_BUILTIN_COUNTER(name) \
   RuntimeCallCounter Handler_##name = RuntimeCallCounter(#name);
   FOR_EACH_HANDLER_COUNTER(CALL_BUILTIN_COUNTER)
 #undef CALL_BUILTIN_COUNTER
 
   static const CounterId counters[];
+  static const int counters_count;
 
   // Starting measuring the time for a function. This will establish the
   // connection to the parent counter for properly calculating the own times.
   V8_EXPORT_PRIVATE static void Enter(RuntimeCallStats* stats,
                                       RuntimeCallTimer* timer,
                                       CounterId counter_id);
 
   // Leave a scope for a measured runtime function. This will properly add
   // the time delta to the current_counter and subtract the delta from its
   // parent.
@@ skipping 476 matching lines @@
 
   explicit Counters(Isolate* isolate);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Counters);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COUNTERS_H_