Change the FileUtilProxy callbacks to report error codes instead of booleans....

base/platform_file.h

Index: base/platform_file.h
===================================================================
--- base/platform_file.h	(revision 56938)
+++ base/platform_file.h	(working copy)
@@ -37,9 +37,17 @@
   PLATFORM_FILE_ASYNC = 256,
   PLATFORM_FILE_TEMPORARY = 512,        // Used on Windows only
   PLATFORM_FILE_HIDDEN = 1024,          // Used on Windows only
-  PLATFORM_FILE_DELETE_ON_CLOSE = 2048
+  PLATFORM_FILE_DELETE_ON_CLOSE = 2048,
+  PLATFORM_FILE_TRUNCATE = 4096  // Used on Windows only

[darin (slow to review), 2010/08/24 17:43:14]

don't we need to support truncation on other platforms?

[dumi, 2010/08/24 19:14:57]

this belongs to a different CL. removed.

 };
 
+// TODO(dumi): add more specific error codes for CreatePlatformFile().
+// TODO(dumi): add more error codes as we add new methods to FileUtilProxy.
+enum PlatformFileErrors {
+  PLATFORM_FILE_OK = 0,
+  PLATFORM_FILE_ERROR = -1
+};
+
 // Creates or opens the given file. If PLATFORM_FILE_OPEN_ALWAYS is used, and
 // |created| is provided, |created| will be set to true if the file was created
 // or to false in case the file was just opened.