Improve accessibility of user image selection screen.

chrome/browser/chromeos/login/default_user_images.h

Index: chrome/browser/chromeos/login/default_user_images.h
diff --git a/chrome/browser/chromeos/login/default_user_images.h b/chrome/browser/chromeos/login/default_user_images.h
index ffec8ffe28f3cf5ca11950a606208cb4d7668402..b7bb9d0b66e294ae1b915387ef4cc0f5a0233882 100644
--- a/chrome/browser/chromeos/login/default_user_images.h
+++ b/chrome/browser/chromeos/login/default_user_images.h
@@ -8,6 +8,8 @@
 #include <cstddef>  // for size_t
 #include <string>
 
+#include "base/string16.h"
+
 namespace gfx {
 class ImageSkia;
 }
@@ -34,6 +36,9 @@ bool IsDefaultImageUrl(const std::string url, int* image_id);
 // Returns bitmap of default user image with specified index.
 const gfx::ImageSkia& GetDefaultImage(int index);
 
+// Returns a description of a default user image with specified index.
+string16 GetDefaultImageDescription(int index);
+
 // Resource IDs of default user images.
 extern const int kDefaultImageResources[];