Moving away from shell api to support long path names on windows for filesystem.

base/file_path.h

Index: base/file_path.h
===================================================================
--- base/file_path.h	(revision 68690)
+++ base/file_path.h	(working copy)
@@ -151,6 +151,12 @@
   // The character used to identify a file extension.
   static const CharType kExtensionSeparator;
 
+#if defined(OS_WIN)
+  // Path length is limited to 260 on windows unless prefixed

[Mark Mentovai, 2010/12/16 19:48:19]

Windows, a proper name, requires a capital letter. Same on line 317.

[Kavita Kanetkar, 2010/12/17 00:59:32]

Done.

+  // with a special extended path prefix.
+  static const CharType kExtendedPathPrefix[];
+#endif
+
   FilePath();
   FilePath(const FilePath& that);
   explicit FilePath(const StringType& path);
@@ -307,6 +313,11 @@
   FilePath NormalizeWindowsPathSeparators() const;
 #endif
 
+#if defined(OS_WIN)
+  // On windows, returns whether or not path starts with extended path prefix.

[Mark Mentovai, 2010/12/16 19:48:19]

path. Which path? The path?

extended path prefix. Which extended path prefix? The extended path prefix?

  // On Windows, returns true if the path starts with the extended path prefix.

[Kavita Kanetkar, 2010/12/17 00:59:32]

Done.

+  bool StartsWithExtendedPathPrefix() const;

[Mark Mentovai, 2010/12/16 19:48:19]

A new function requires a unit test, even if it’s a simple and relatively stupid
test.

[Kavita Kanetkar, 2010/12/17 00:59:32]

Done.

+#endif
+
   // Compare two strings in the same way the file system does.
   // Note that these always ignore case, even on file systems that are case-
   // sensitive. If case-sensitive comparison is ever needed, add corresponding