Make CPU profiler do not hog 100% of CPU.

src/sampler.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/sampler.h"
 
 #if V8_OS_POSIX && !V8_OS_CYGWIN
 
 #define USE_SIGNALS
 
@@ skipping 540 matching lines @@
         base::LockGuard<base::Mutex> lock_guard(mutex_);
         if (active_samplers_.is_empty()) break;
         // When CPU profiling is enabled both JavaScript and C++ code is
         // profiled. We must not suspend.
         for (int i = 0; i < active_samplers_.length(); ++i) {
           Sampler* sampler = active_samplers_.at(i);
           if (!sampler->IsProfiling()) continue;
           sampler->DoSample();
         }
       }
-      base::OS::Sleep(interval_);
+      base::OS::Sleep(base::TimeDelta::FromMilliseconds(interval_));
     }
   }
 
  private:
   // Protects the process wide state below.
   static base::Mutex* mutex_;
   static SamplerThread* instance_;
 
   const int interval_;
   List<Sampler*> active_samplers_;
@@ skipping 197 matching lines @@
 #endif  // USE_SIMULATOR
     SampleStack(state);
   }
   ResumeThread(profiled_thread);
 }
 
 #endif  // USE_SIGNALS
 
 
 } }  // namespace v8::internal