Make CPU profiler do not hog 100% of CPU.

test/cctest/test-log.cc

 // Copyright 2006-2009 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 172 matching lines @@
       v8::HandleScope scope;
       v8::Persistent<v8::Context> context = v8::Context::New();
       CHECK(!context.IsEmpty());
       {
         v8::Context::Scope context_scope(context);
         SignalRunning();
         CompileRun(
             "var j; for (var i=0; i<10000; ++i) { j = Math.sin(i); }");
       }
       context.Dispose();
-      i::OS::Sleep(1);
+      i::OS::Sleep(v8::base::TimeDelta::FromMilliseconds(1));
     }
   }
 };
 
 
 class LoopingNonJsThread : public LoopingThread {
  public:
   explicit LoopingNonJsThread(v8::internal::Isolate* isolate)
       : LoopingThread(isolate) { }
   void RunLoop() {
     v8::Locker locker;
     v8::Unlocker unlocker;
     // Now thread has V8's id, but will not run VM code.
     CHECK(CcTest::i_isolate() != NULL);
     CHECK_GT(CcTest::i_isolate()->thread_manager()->CurrentId(), 0);
     double i = 10;
     SignalRunning();
     while (IsRunning()) {
       i = std::sin(i);
-      i::OS::Sleep(1);
+      i::OS::Sleep(v8::base::TimeDelta::FromMilliseconds(1));
     }
   }
 };
 
 
 class TestSampler : public v8::internal::Sampler {
  public:
   explicit TestSampler(v8::internal::Isolate* isolate)
       : Sampler(isolate, 0, true, true),
         semaphore_(new v8::internal::Semaphore(0)),
@@ skipping 300 matching lines @@
     CHECK(exists);
     i::EmbeddedVector<char, 100> ref_data;
     i::SNPrintF(ref_data, "v8-version,%d,%d,%d,%d,%d", i::Version::GetMajor(),
                 i::Version::GetMinor(), i::Version::GetBuild(),
                 i::Version::GetPatch(), i::Version::IsCandidate());
     CHECK(StrNStr(log.start(), ref_data.start(), log.length()));
     log.Dispose();
   }
   isolate->Dispose();
 }