[cros] Define a range of stock user images availables for selection.

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 1e618045eeefb0088be89a89f6689162958bef10..6b314181a8c929bd973880b6d0fc417d2d788341 100644
--- a/chrome/browser/chromeos/login/default_user_images.h
+++ b/chrome/browser/chromeos/login/default_user_images.h
@@ -40,22 +40,36 @@ extern const int kDefaultImageResources[];
 // Number of default images.
 extern const int kDefaultImagesCount;
 
-// Image index to be used in histograms when user image is taken from file.
+// The starting index of default images available for selection. Note that
+// existing users may have images with smaller indices.
+extern const int kFirstDefaultImageIndex;
+
+/// Histogram values. ////////////////////////////////////////////////////////
+
+// Histogram value for user image taken from file.
 extern const int kHistogramImageFromFile;
 
-// Image index to be used in histograms when user image is taken from camera.
+// Histogram value for user image taken from camera.
 extern const int kHistogramImageFromCamera;
 
-// Image index to be used in histograms when user selects a previously used
-// image from camera/file.
+// Histogram value a previously used image from camera/file.
 extern const int kHistogramImageOld;
 
-// Image index to be used in histograms when user image is taken from profile.
+// Histogram value for user image from G+ profile.
 extern const int kHistogramImageFromProfile;
 
-// Number of possible user image indices to be used in histograms.
+// Histogram value for user video (animated avatar) from camera.
+extern const int kHistogramVideoFromCamera;
+
+// Histogram value for user video from file.
+extern const int kHistogramVideoFromFile;
+
+// Number of possible histogram values for user images.
 extern const int kHistogramImagesCount;
 
+// Returns the histogram value corresponding to the given default image index.
+int GetDefaultImageHistogramValue(int index);
+
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_DEFAULT_USER_IMAGES_H_