Allow configuring CPU profiler sampling interval

Source/bindings/v8/ScriptProfiler.cpp

 /*
  * Copyright (c) 2011, Google Inc. 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
@@ skipping 32 matching lines @@
 
 #include <v8-profiler.h>
 #include <v8.h>
 
 #include "wtf/ThreadSpecific.h"
 
 namespace WebCore {
 
 typedef HashMap<String, double> ProfileNameIdleTimeMap;
 
+void ScriptProfiler::setSamplingInterval(int intervalUs)
+{
+    v8::Isolate* isolate = v8::Isolate::GetCurrent();
+    v8::CpuProfiler* profiler = isolate->GetCpuProfiler();
+    if (profiler)
+        profiler->SetSamplingInterval(intervalUs);
+}
+
 void ScriptProfiler::start(const String& title)
 {
     ProfileNameIdleTimeMap* profileNameIdleTimeMap = ScriptProfiler::currentProfileNameIdleTimeMap();
     if (profileNameIdleTimeMap->contains(title))
         return;
     profileNameIdleTimeMap->add(title, 0);
 
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     v8::CpuProfiler* profiler = isolate->GetCpuProfiler();
     if (!profiler)
@@ skipping 241 matching lines @@
 }
 
 void ScriptProfiler::setIdle(bool isIdle)
 {
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     if (v8::CpuProfiler* profiler = isolate->GetCpuProfiler())
         profiler->SetIdle(isIdle);
 }
 
 } // namespace WebCore