Make CPU profiler do not hog 100% of CPU.

src/runtime/runtime-test.cc

 // Copyright 2014 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/v8.h"
 
 #include "src/arguments.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen.h"
 #include "src/runtime/runtime-utils.h"
@@ skipping 158 matching lines @@
     CONVERT_ARG_HANDLE_CHECKED(String, sync, 1);
     if (sync->IsOneByteEqualTo(STATIC_CHAR_VECTOR("no sync"))) {
       sync_with_compiler_thread = false;
     }
   }
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
   if (isolate->concurrent_recompilation_enabled() &&
       sync_with_compiler_thread) {
     while (function->IsInOptimizationQueue()) {
       isolate->optimizing_compile_dispatcher()->InstallOptimizedFunctions();
-      base::OS::Sleep(50);
+      base::OS::Sleep(base::TimeDelta::FromMilliseconds(50));
     }
   }
   if (FLAG_always_opt) {
     // With --always-opt, optimization status expectations might not
     // match up, so just return a sentinel.
     return Smi::FromInt(3);  // 3 == "always".
   }
   if (FLAG_deopt_every_n_times) {
     return Smi::FromInt(6);  // 6 == "maybe deopted".
   }
@@ skipping 293 matching lines @@
   RUNTIME_FUNCTION(Runtime_HasFixed##Type##Elements) {                        \
     CONVERT_ARG_CHECKED(JSObject, obj, 0);                                    \
     return isolate->heap()->ToBoolean(obj->HasFixed##Type##Elements());       \
   }
 
 TYPED_ARRAYS(FIXED_TYPED_ARRAYS_CHECK_RUNTIME_FUNCTION)
 
 #undef FIXED_TYPED_ARRAYS_CHECK_RUNTIME_FUNCTION
 }
 }  // namespace v8::internal