Allow configuring CPU profiler sampling interval using public API

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 1a422fb73861a319e5d66a3c2603116767378f09..5901e450dfe8948fc1cc353b99cf96a7c97dc81c 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -53,6 +53,7 @@
 #endif
 #include "parser.h"
 #include "platform.h"
+#include "platform/time.h"
 #include "profile-generator-inl.h"
 #include "property-details.h"
 #include "property.h"
@@ -7348,6 +7349,13 @@ int CpuProfiler::GetProfileCount() {
 }
 
 
+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));