Make CPU profiler do not hog 100% of CPU.

test/cctest/test-cpu-profiler.cc

 // Copyright 2010 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 789 matching lines @@
   }
 
   void set_warming_up(bool value) { is_warming_up_ = value; }
 
  private:
   void Wait() {
     if (is_warming_up_) return;
     double start = v8::base::OS::TimeCurrentMillis();
     double duration = 0;
     while (duration < min_duration_ms_) {
-      v8::base::OS::Sleep(1);
+      v8::base::OS::Sleep(v8::base::TimeDelta::FromMilliseconds(1));
       duration = v8::base::OS::TimeCurrentMillis() - start;
     }
   }
 
   template<typename T>
   static TestApiCallbacks* fromInfo(const T& info) {
     void* data = v8::External::Cast(*info.Data())->Value();
     return reinterpret_cast<TestApiCallbacks*>(data);
   }
 
@@ skipping 1207 matching lines @@
   iprofile->Print();
   v8::CpuProfile* profile = reinterpret_cast<v8::CpuProfile*>(iprofile);
 
   const char* branch[] = {"", "test"};
   const ProfileNode* itest_node =
       GetSimpleBranch(profile, branch, arraysize(branch));
   CHECK_EQ(0U, itest_node->deopt_infos().size());
 
   iprofiler->DeleteProfile(iprofile);
 }