No need to start Ticker for Crankshaft

src/log.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 150 matching lines @@
   };
 #undef DECLARE_ENUM
 
   // Acquires resources for logging if the right flags are set.
   bool SetUp();
 
   // Sets the current code event handler.
   void SetCodeEventHandler(uint32_t options,
                            JitCodeEventHandler event_handler);
 
-  void EnsureTickerStarted();
-  void EnsureTickerStopped();
-
   Sampler* sampler();
 
   // Frees resources acquired in SetUp.
   // When a temporary file is used for the log, returns its stream descriptor,
   // leaving the file open.
   FILE* TearDown();
 
   // Emits an event with a string value -> (name, value).
   void StringEvent(const char* name, const char* value);
 
@@ skipping 257 matching lines @@
 
   void ApiEvent(const char* name, ...);
 
   // Logs a StringEvent regardless of whether FLAG_log is true.
   void UncheckedStringEvent(const char* name, const char* value);
 
   // Logs an IntEvent regardless of whether FLAG_log is true.
   void UncheckedIntEvent(const char* name, int value);
   void UncheckedIntPtrTEvent(const char* name, intptr_t value);
 
-  // Returns whether profiler's sampler is active.
-  bool IsProfilerSamplerActive();
-
   Isolate* isolate_;
 
   // The sampler used by the profiler and the sliding state window.
   Ticker* ticker_;
 
   // When the statistical profile is active, profiler_
   // points to a Profiler, that handles collection
   // of samples.
   Profiler* profiler_;
 
@@ skipping 83 matching lines @@
 // Class that extracts stack trace, used for profiling.
 class StackTracer : public AllStatic {
  public:
   static void Trace(Isolate* isolate, TickSample* sample);
 };
 
 } }  // namespace v8::internal
 
 
 #endif  // V8_LOG_H_