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

chrome/browser/ui/ash/chrome_shell_delegate_chromeos.cc

Index: chrome/browser/ui/ash/chrome_shell_delegate_chromeos.cc
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate_chromeos.cc b/chrome/browser/ui/ash/chrome_shell_delegate_chromeos.cc
index e2204523a5ceae03868b8a5c23299be8945e58ec..840289d8fc2ab98a6f201aa308c12da61d23b3b9 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate_chromeos.cc
+++ b/chrome/browser/ui/ash/chrome_shell_delegate_chromeos.cc
@@ -42,7 +42,10 @@
 
 namespace {
 
-void InitAfterSessionStart() {
+void InitAfterSessionStart(bool is_first_run) {

[Mr4D (OOO till 08-26), 2015/04/14 20:06:55]

You can remove this.

+  if (!is_first_run)
+    return;
+
   // Restore focus after the user session is started.  It's needed because some
   // windows can be opened in background while login UI is still active because
   // we currently restore browser windows before login UI is deleted.
@@ -263,7 +266,8 @@ void ChromeShellDelegate::Observe(int type,
       break;
     }
     case chrome::NOTIFICATION_SESSION_STARTED:

[Mr4D (OOO till 08-26), 2015/04/14 20:06:55]

Do not call this function in the first place when the variable is false.

You might want to rename it to "InitAfterFirstSessionStart" to make the fact
clearer that this is only needed to do once per system start.

Additionally you might want to add a comment like:

This should only be call once upon system start.

-      InitAfterSessionStart();
+      InitAfterSessionStart(is_first_run_);

[Mr4D (OOO till 08-26), 2015/04/14 20:06:55]

You don't even need is_first_run_ by using:

      if (user_manager::UserManager::Get()->GetLoggedInUsers().size() < 2) {
        InitAfterFirstSessionStart();
      }

+      is_first_run_ = false;
       ash::Shell::GetInstance()->ShowShelf();
       break;
     default: