Bring up the Fast User Switcher on Shift+Click on the new Avatar Button

chrome/browser/profiles/profile_window.cc

Index: chrome/browser/profiles/profile_window.cc
diff --git a/chrome/browser/profiles/profile_window.cc b/chrome/browser/profiles/profile_window.cc
index 320388f389c31804652867d0be3d406c68773c11..3ecc0a08b994346b6d50d6bc1b4937878fc86577 100644
--- a/chrome/browser/profiles/profile_window.cc
+++ b/chrome/browser/profiles/profile_window.cc
@@ -500,6 +500,13 @@ void BubbleViewModeFromAvatarBubbleMode(
       *bubble_view_mode = BUBBLE_VIEW_MODE_PROFILE_CHOOSER;
       *tutorial_mode = TUTORIAL_MODE_SHOW_ERROR;
       return;
+    case BrowserWindow::AVATAR_BUBBLE_MODE_FAST_USER_SWITCH:
+      if (switches::IsFastUserSwitching()) {
+        *bubble_view_mode = profiles::BUBBLE_VIEW_MODE_FAST_PROFILE_CHOOSER;
+      } else {
+        *bubble_view_mode = profiles::BUBBLE_VIEW_MODE_PROFILE_CHOOSER;
+      }
+      return;
     default:
       *bubble_view_mode = profiles::BUBBLE_VIEW_MODE_PROFILE_CHOOSER;
   }