Add profile selector menu to app list.

ui/app_list/app_list_view_delegate.h

Index: ui/app_list/app_list_view_delegate.h
diff --git a/ui/app_list/app_list_view_delegate.h b/ui/app_list/app_list_view_delegate.h
index bd7e3d3837f75193f4d69cffe578b1c006a48ef5..08f54c3d68fc36c896cfd21f658e748abb2e50d2 100644
--- a/ui/app_list/app_list_view_delegate.h
+++ b/ui/app_list/app_list_view_delegate.h
@@ -9,6 +9,8 @@
 #include "base/strings/string16.h"
 #include "ui/app_list/app_list_export.h"
 
+struct AvatarMenuItemModel;
+
 namespace base {
 class FilePath;
 }
@@ -90,6 +92,13 @@ class APP_LIST_EXPORT AppListViewDelegate {
 
   // Open the feedback UI.
   virtual void OpenFeedback() = 0;
+
+  // Returns a vector of |AvatarMenuItemModel|s reflecting the current available
+  // profiles.
+  virtual std::vector<AvatarMenuItemModel> GetAvatarMenuItems() = 0;
+
+  // Shows the app list for the profile specified by |index|.
+  virtual void ShowForProfileAtIndex(size_t index) = 0;
 };
 
 }  // namespace app_list