page cycler: Use buffer-cache priming code on all systems.

base/file_util.h

 // Copyright (c) 2010 The Chromium 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 file contains utility functions for dealing with the local
 // filesystem.
 
 #ifndef BASE_FILE_UTIL_H_
 #define BASE_FILE_UTIL_H_
 
@@ skipping 141 matching lines @@
 // Returns true if the contents of the two files given are equal, false
 // otherwise.  If either file can't be read, returns false.
 bool ContentsEqual(const FilePath& filename1,
                    const FilePath& filename2);
 
 // Returns true if the contents of the two text files given are equal, false
 // otherwise.  This routine treats "\r\n" and "\n" as equivalent.
 bool TextContentsEqual(const FilePath& filename1, const FilePath& filename2);
 
 // Read the file at |path| into |contents|, returning true on success.
+// |contents| may be NULL, in which case this function is useful for its
+// side effect of priming the disk cache.
 // Useful for unit tests.
 bool ReadFileToString(const FilePath& path, std::string* contents);
 
 #if defined(OS_POSIX)
 // Read exactly |bytes| bytes from file descriptor |fd|, storing the result
 // in |buffer|. This function is protected against EINTR and partial reads.
 // Returns true iff |bytes| bytes have been successfuly read from |fd|.
 bool ReadFromFD(int fd, char* buffer, size_t bytes);
 #endif  // defined(OS_POSIX)
 
@@ skipping 404 matching lines @@
 
 #endif  // UNIT_TEST
 
 }  // namespace file_util
 
 // Deprecated functions have been moved to this separate header file,
 // which must be included last after all the above definitions.
 #include "base/file_util_deprecated.h"
 
 #endif  // BASE_FILE_UTIL_H_