Base: WritePlatformFile now retries the operation if

base/platform_file_unittest.cc

 // Copyright (c) 2011 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.
 
 #include "base/file_util.h"
 #include "base/platform_file.h"
 #include "base/scoped_temp_dir.h"
 #include "base/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 19 matching lines @@
     total_bytes_read += bytes_read;
   }
 
   return total_bytes_read;
 }
 
 // Writes the given number of bytes to a file.
 // Returns the number of bytes written.
 int WriteFully(base::PlatformFile file, int64 offset,
                const char* data, int size) {
-  int total_bytes_written = 0;
-  int bytes_written;
-  while (total_bytes_written < size) {
-    bytes_written = base::WritePlatformFile(
-        file, offset + total_bytes_written, &data[total_bytes_written],
-        size - total_bytes_written);
-
-    if ((bytes_written == 0) && (size == 0))
-      return 0;
-
-    if ((bytes_written <= 0) || (bytes_written > size - total_bytes_written))
-      return -1;
-
-    total_bytes_written += bytes_written;
-  }
-
-  return total_bytes_written;
+  return base::WritePlatformFile(file, offset, data, size);
 }
 
 } // namespace
 
 TEST(PlatformFile, CreatePlatformFile) {
   ScopedTempDir temp_dir;
   ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
   FilePath file_path = temp_dir.path().AppendASCII("create_file_1");
 
   // Open a file that doesn't exist.
@@ skipping 286 matching lines @@
   EXPECT_EQ(info.last_modified.ToInternalValue(),
             new_last_modified.ToInternalValue());
 #endif
 
   EXPECT_EQ(info.creation_time.ToInternalValue(),
             creation_time.ToInternalValue());
 
   // Close the file handle to allow the temp directory to be deleted.
   base::ClosePlatformFile(file);
 }