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

chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/profiles/avatar_base_controller.h"
 
 #include "base/mac/foundation_util.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile_info_cache_observer.h"
@@ skipping 192 matching lines @@
       addObserver:self
          selector:@selector(bubbleWillClose:)
              name:NSWindowWillCloseNotification
            object:[menuController_ window]];
   [menuController_ showWindow:self];
 
   ProfileMetrics::LogProfileOpenMethod(ProfileMetrics::ICON_AVATAR_BUBBLE);
 }
 
 - (IBAction)buttonClicked:(id)sender {
+  BrowserWindow::AvatarBubbleMode mode =
+      BrowserWindow::AVATAR_BUBBLE_MODE_DEFAULT;
+
+  if([NSEvent modifierFlags] & NSCommandKeyMask)

[Alexei Svitkine (slow), 2015/02/02 17:22:30]

Nit: space after if

[anthonyvd, 2015/02/03 21:53:20]

Done.

+    mode = BrowserWindow::AVATAR_BUBBLE_MODE_FAST_USER_SWITCH;
+
   [self showAvatarBubbleAnchoredAt:button_
-                          withMode:BrowserWindow::AVATAR_BUBBLE_MODE_DEFAULT
+                          withMode:mode
                    withServiceType:signin::GAIA_SERVICE_TYPE_NONE];
 }
 
 - (void)bubbleWillClose:(NSNotification*)notif {
   NSWindowController* wc =
       [browser_->window()->GetNativeWindow() windowController];
   if ([wc isKindOfClass:[BrowserWindowController class]]) {
     [static_cast<BrowserWindowController*>(wc)
         releaseBarVisibilityForOwner:self withAnimation:YES delay:NO];
   }
   menuController_ = nil;
 }
 
 - (void)updateAvatarButtonAndLayoutParent:(BOOL)layoutParent {
   NOTREACHED();
 }
 
 - (void)updateErrorStatus:(BOOL)hasError {
 }
 
 - (BaseBubbleController*)menuController {
   return menuController_;
 }
 
 @end