Add profile selector menu to app list.

ui/app_list/signin_delegate.h

Index: ui/app_list/signin_delegate.h
diff --git a/ui/app_list/signin_delegate.h b/ui/app_list/signin_delegate.h
index eda67f410e8dea7a182890c8b000356f4c7d36ca..24289e30838a5edb76e319cb684a2e0db254b433 100644
--- a/ui/app_list/signin_delegate.h
+++ b/ui/app_list/signin_delegate.h
@@ -10,6 +10,10 @@
 #include "base/strings/string16.h"
 #include "ui/app_list/app_list_export.h"
 
+namespace base {
+class FilePath;
+}
+
 namespace app_list {
 
 class SigninDelegateObserver;
@@ -30,6 +34,8 @@ class APP_LIST_EXPORT SigninDelegate {
   virtual base::string16 GetLearnMoreLinkText() = 0;
   virtual base::string16 GetSettingsLinkText() = 0;
 
+  virtual void SetProfileByPath(base::FilePath profile_path) = 0;
+
   void AddObserver(SigninDelegateObserver* observer);
   void RemoveObserver(SigninDelegateObserver* observer);