Fix fast user switcher appearance when empty.

chrome/browser/profiles/profile_metrics.h

Index: chrome/browser/profiles/profile_metrics.h
diff --git a/chrome/browser/profiles/profile_metrics.h b/chrome/browser/profiles/profile_metrics.h
index 8feb60fe2f48c3a876b2d7e0db070a4fc38ce104..fde013aa70e20081a8669036aa88ce8520f4080b 100644
--- a/chrome/browser/profiles/profile_metrics.h
+++ b/chrome/browser/profiles/profile_metrics.h
@@ -55,15 +55,26 @@ class ProfileMetrics {
 
   // Enum for counting the ways user profiles and menus were opened.
   enum ProfileOpen {
-    NTP_AVATAR_BUBBLE = 0,    // User opens avatar menu from NTP
-    ICON_AVATAR_BUBBLE,       // User opens the avatar menu from button
-    SWITCH_PROFILE_ICON,      // User switches profiles from icon menu
-    SWITCH_PROFILE_MENU,      // User switches profiles from menu bar
-    SWITCH_PROFILE_DOCK,      // User switches profiles from dock (Mac-only)
-    OPEN_USER_MANAGER,        // User opens the User Manager
-    SWITCH_PROFILE_MANAGER,   // User switches profiles from the User Manager
-    SWITCH_PROFILE_UNLOCK,    // User switches to lockd profile via User Manager
-    SWITCH_PROFILE_GUEST,     // User switches to guest profile
+    // User opens avatar menu from NTP.
+    NTP_AVATAR_BUBBLE = 0,
+    // User opens the avatar menu from button.
+    ICON_AVATAR_BUBBLE,
+    // User switches profiles from icon menu.
+    SWITCH_PROFILE_ICON,
+    // User switches profiles from menu bar.
+    SWITCH_PROFILE_MENU,
+    // User switches profiles from dock (Mac-only).
+    SWITCH_PROFILE_DOCK,
+    // User opens the User Manager.
+    OPEN_USER_MANAGER,
+    // User switches profiles from the User Manager.
+    SWITCH_PROFILE_MANAGER,
+    // User switches to locked profile via User Manager.
+    SWITCH_PROFILE_UNLOCK,
+    // User switches to guest profile.
+    SWITCH_PROFILE_GUEST,
+    // User switches profiles from the Avatar Menu fast user switcher.

[Mike Lerman, 2015/02/20 14:40:57]

s/Avatar Menu/User Menu

[anthonyvd, 2015/02/20 15:01:31]

Done.

+    SWITCH_PROFILE_FAST_SWITCHER,

[Alexei Svitkine (slow), 2015/02/19 22:24:28]

Please update histograms.xml' definition of this enum.

[anthonyvd, 2015/02/20 15:01:31]

Done.

     NUM_PROFILE_OPEN_METRICS
   };