Minimized windows should not be activated by another user in multiprofile scenario.

ash/session/session_state_delegate.h

Index: ash/session/session_state_delegate.h
diff --git a/ash/session/session_state_delegate.h b/ash/session/session_state_delegate.h
index e3b2dc4e6960f354640464d2f27607fac452d506..5e73e58310c225049f33b2c449e0a91d053ea1ef 100644
--- a/ash/session/session_state_delegate.h
+++ b/ash/session/session_state_delegate.h
@@ -81,6 +81,11 @@ class ASH_EXPORT SessionStateDelegate {
   virtual content::BrowserContext* GetBrowserContextForWindow(
       aura::Window* window) = 0;
 
+  // Returns the browser context on which the window is currently shown. NULL
+  // means the window will be shown for every user.
+  virtual content::BrowserContext* GetUserPresentingBrowserContextForWindow(
+      aura::Window* window) = 0;
+
   // Returns the maximum possible number of logged in users.
   virtual int GetMaximumNumberOfLoggedInUsers() const = 0;