Add file access modes to sk_exists.

src/ports/SkOSFile_stdio.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkOSFile.h"
 
 #include <errno.h>
 #include <stdio.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 
 #ifdef _WIN32
 #include <direct.h>
 #include <io.h>
-#else
-#include <unistd.h>
 #endif
 
 SkFILE* sk_fopen(const char path[], SkFILE_Flags flags) {
     char    perm[4];
     char*   p = perm;
 
     if (flags & kRead_SkFILE_Flag) {
         *p++ = 'r';
     }
     if (flags & kWrite_SkFILE_Flag) {
@@ skipping 86 matching lines @@
         return 0;
     }
     return curr;
 }
 
 void sk_fclose(SkFILE* f) {
     SkASSERT(f);
     ::fclose((FILE*)f);
 }
 
-bool sk_exists(const char *path) {
-#ifdef _WIN32
-    return (0 == _access(path, 0));
-#else
-    return (0 == access(path, 0));
-#endif
-}
-
 bool sk_isdir(const char *path) {
     struct stat status;
     if (0 != stat(path, &status)) {
         return false;
     }
     return SkToBool(status.st_mode & S_IFDIR);
 }
 
 bool sk_mkdir(const char* path) {
     if (sk_isdir(path)) {
@@ skipping 12 matching lines @@
 #else
     retval = mkdir(path, 0777);
 #endif
     if (0 == retval) {
         return true;
     } else {
         fprintf(stderr, "sk_mkdir: error %d creating dir '%s'\n", errno, path);
         return false;
     }
 }