Make CPU profiler do not hog 100% of CPU.

src/base/platform/platform.h

 // 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.
 
 // This module contains the platform-specific code. This make the rest of the
 // code less dependent on operating system, compilers and runtime libraries.
 // This module does specifically not deal with differences between different
 // processor architecture.
 // The platform classes have the same definition for all platforms. The
 // implementation for a particular platform is put in platform_<os>.cc.
@@ skipping 172 matching lines @@
 
   // Assign memory as a guard page so that access will cause an exception.
   static void Guard(void* address, const size_t size);
 
   // Generate a random address to be used for hinting mmap().
   static void* GetRandomMmapAddr();
 
   // Get the Alignment guaranteed by Allocate().
   static size_t AllocateAlignment();
 
-  // Sleep for a number of milliseconds.
-  static void Sleep(const int milliseconds);
+  // Sleep for a specified time interval.
+  static void Sleep(TimeDelta interval);
 
   // Abort the current process.
   static void Abort();
 
   // Debug break.
   static void DebugBreak();
 
   // Walk the stack.
   static const int kStackWalkError = -1;
   static const int kStackWalkMaxNameLen = 256;
@@ skipping 265 matching lines @@
   char name_[kMaxThreadNameLength];
   int stack_size_;
   Semaphore* start_semaphore_;
 
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 } }  // namespace v8::base
 
 #endif  // V8_BASE_PLATFORM_PLATFORM_H_