Allow configuring CPU profiler sampling interval using public API

src/api.cc

 // 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 35 matching lines @@
 #include "heap-profiler.h"
 #include "heap-snapshot-generator-inl.h"
 #include "icu_util.h"
 #include "json-parser.h"
 #include "messages.h"
 #ifdef COMPRESS_STARTUP_DATA_BZ2
 #include "natives.h"
 #endif
 #include "parser.h"
 #include "platform.h"
+#include "platform/time.h"
 #include "profile-generator-inl.h"
 #include "property-details.h"
 #include "property.h"
 #include "runtime.h"
 #include "runtime-profiler.h"
 #include "scanner-character-streams.h"
 #include "snapshot.h"
 #include "unicode-inl.h"
 #include "v8threads.h"
 #include "version.h"
@@ skipping 7275 matching lines @@
 int CpuProfile::GetSamplesCount() const {
   return reinterpret_cast<const i::CpuProfile*>(this)->samples_count();
 }
 
 
 int CpuProfiler::GetProfileCount() {
   return reinterpret_cast<i::CpuProfiler*>(this)->GetProfilesCount();
 }
 
 
+void CpuProfiler::SetSamplingInterval(int us) {
+  ASSERT(us >= 0);
+  return reinterpret_cast<i::CpuProfiler*>(this)->set_sampling_interval(
+      i::TimeDelta::FromMicroseconds(us));
+}
+
+
 const CpuProfile* CpuProfiler::GetCpuProfile(int index) {
   return reinterpret_cast<const CpuProfile*>(
       reinterpret_cast<i::CpuProfiler*>(this)->GetProfile(index));
 }
 
 
 void CpuProfiler::StartCpuProfiling(Handle<String> title, bool record_samples) {
   reinterpret_cast<i::CpuProfiler*>(this)->StartProfiling(
       *Utils::OpenHandle(*title), record_samples);
 }
@@ skipping 521 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   return callback(info);
 }
 
 
 } }  // namespace v8::internal