Allow configuring CPU profiler sampling interval using public API

src/cpu-profiler.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 13 matching lines @@
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef V8_CPU_PROFILER_H_
 #define V8_CPU_PROFILER_H_
 
 #include "allocation.h"
 #include "atomicops.h"
 #include "circular-queue.h"
+#include "platform/time.h"
 #include "sampler.h"
 #include "unbound-queue.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class CodeEntry;
 class CodeMap;
 class CompilationInfo;
@@ skipping 152 matching lines @@
  public:
   explicit CpuProfiler(Isolate* isolate);
 
   CpuProfiler(Isolate* isolate,
               CpuProfilesCollection* test_collection,
               ProfileGenerator* test_generator,
               ProfilerEventsProcessor* test_processor);
 
   virtual ~CpuProfiler();
 
+  void set_sampling_interval(TimeDelta value);
   void StartProfiling(const char* title, bool record_samples = false);
   void StartProfiling(String* title, bool record_samples);
   CpuProfile* StopProfiling(const char* title);
   CpuProfile* StopProfiling(String* title);
   int GetProfilesCount();
   CpuProfile* GetProfile(int index);
   void DeleteAllProfiles();
   void DeleteProfile(CpuProfile* profile);
 
   // Invoked from stack sampler (thread or signal handler.)
@@ skipping 37 matching lines @@
   Isolate* isolate() const { return isolate_; }
 
  private:
   void StartProcessorIfNotStarted();
   void StopProcessorIfLastProfile(const char* title);
   void StopProcessor();
   void ResetProfiles();
   void LogBuiltins();
 
   Isolate* isolate_;
+  TimeDelta sampling_interval_;
   CpuProfilesCollection* profiles_;
   unsigned next_profile_uid_;
   ProfileGenerator* generator_;
   ProfilerEventsProcessor* processor_;
   bool saved_is_logging_;
   bool is_profiling_;
 
   DISALLOW_COPY_AND_ASSIGN(CpuProfiler);
 };
 
 } }  // namespace v8::internal
 
 
 #endif  // V8_CPU_PROFILER_H_