Add missing include for sleep

bench/nanobench.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <ctype.h>
 
 #include "nanobench.h"
@@ skipping 24 matching lines @@
 #include "SkOSFile.h"
 #include "SkPictureRecorder.h"
 #include "SkPictureUtils.h"
 #include "SkString.h"
 #include "SkSurface.h"
 #include "SkTaskGroup.h"
 #include "SkThreadUtils.h"
 
 #include <stdlib.h>
 
+#ifndef SK_BUILD_FOR_WIN32
+    #include <unistd.h>
+#endif
+
 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
     #include "nanobenchAndroid.h"
 #endif
 
 #if SK_SUPPORT_GPU
     #include "gl/GrGLDefines.h"
     #include "GrCaps.h"
     #include "GrContextFactory.h"
     SkAutoTDelete<GrContextFactory> gGrFactory;
 #endif
@@ skipping 1168 matching lines @@
 
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return nanobench_main();
 }
 #endif