Newly created profiles should have the grey silhouette as avatar.

chrome/browser/profiles/profile_info_cache.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_INFO_CACHE_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_INFO_CACHE_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 110 matching lines @@
 
   // Returns an avatar icon index that can be assigned to a newly created
   // profile. Note that the icon may not be unique since there are a limited
   // set of default icons.
   size_t ChooseAvatarIconIndexForNewProfile() const;
 
   const base::FilePath& GetUserDataDir() const;
 
   // Gets the number of default avatar icons that exist.
   static size_t GetDefaultAvatarIconCount();
+  // Gets the index for the (grey silhouette) avatar used as a placeholder.
+  static int GetPlaceholderAvatarIndex();
   // Gets the resource ID of the default avatar icon at |index|.
   static int GetDefaultAvatarIconResourceIDAtIndex(size_t index);
+  // Gets the resource ID of the placeholder avatar icon.
+  static int GetPlaceholderAvatarIconResourceID();
   // Returns a URL for the default avatar icon with specified index.
   static std::string GetDefaultAvatarIconUrl(size_t index);
   // Checks if |index| is a valid avatar icon index
   static bool IsDefaultAvatarIconIndex(size_t index);
   // Checks if the given URL points to one of the default avatar icons. If it
   // is, returns true and its index through |icon_index|. If not, returns false.
   static bool IsDefaultAvatarIconUrl(const std::string& icon_url,
                                      size_t *icon_index);
 
   // Gets all names of profiles associated with this instance of Chrome.
@@ skipping 55 matching lines @@
   // lazily so it needs to be mutable.
   mutable std::map<std::string, gfx::Image*> cached_avatar_images_;
   // Marks a profile picture as loading. This prevents a picture from
   // loading multiple times.
   mutable std::map<std::string, bool> cached_avatar_images_loading_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileInfoCache);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_INFO_CACHE_H_