Make CPU profiler do not hog 100% of CPU.

src/base/platform/platform-posix.cc

 // Copyright 2012 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.
 
 // Platform-specific code for POSIX goes here. This is not a platform on its
 // own, but contains the parts which are the same across the POSIX platforms
 // Linux, MacOS, FreeBSD, OpenBSD, NetBSD and QNX.
 
 #include <errno.h>
 #include <limits.h>
@@ skipping 201 matching lines @@
 #endif
   return reinterpret_cast<void*>(raw_addr);
 }
 
 
 size_t OS::AllocateAlignment() {
   return static_cast<size_t>(sysconf(_SC_PAGESIZE));
 }
 
 
-void OS::Sleep(int milliseconds) {
-  useconds_t ms = static_cast<useconds_t>(milliseconds);
-  usleep(1000 * ms);
+void OS::Sleep(TimeDelta interval) {
+  usleep(static_cast<useconds_t>(interval.InMicroseconds()));
 }
 
 
 void OS::Abort() {
   if (g_hard_abort) {
     V8_IMMEDIATE_CRASH();
   }
   // Redirect to std abort to signal abnormal program termination.
   abort();
 }
@@ skipping 521 matching lines @@
 
 void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
   pthread_key_t pthread_key = LocalKeyToPthreadKey(key);
   int result = pthread_setspecific(pthread_key, value);
   DCHECK_EQ(0, result);
   USE(result);
 }
 
 
 } }  // namespace v8::base