Bring up fast user switcher on right-click of the avatar menu on Mac.

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

Index: chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm
diff --git a/chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm b/chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm
index 66a424ad327b0aeb50b151867c7b65c4f1ac496d..00cb1b3f3749e889836d8ca0177f7f2a825c3f0a 100644
--- a/chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm
+++ b/chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm
@@ -33,6 +33,7 @@ const CGFloat kMenuXOffsetAdjust = 2.0;
 @interface AvatarBaseController (Private)
 // Shows the avatar bubble.
 - (IBAction)buttonClicked:(id)sender;
+- (IBAction)buttonRightClicked:(id)sender;
 
 - (void)bubbleWillClose:(NSNotification*)notif;
 
@@ -213,8 +214,14 @@ class ProfileInfoUpdateObserver : public ProfileInfoCacheObserver,
   BrowserWindow::AvatarBubbleMode mode =
       BrowserWindow::AVATAR_BUBBLE_MODE_DEFAULT;
 
-  if ([NSEvent modifierFlags] & NSCommandKeyMask)
-    mode = BrowserWindow::AVATAR_BUBBLE_MODE_FAST_USER_SWITCH;
+  [self showAvatarBubbleAnchoredAt:button_
+                          withMode:mode
+                   withServiceType:signin::GAIA_SERVICE_TYPE_NONE];
+}
+
+- (IBAction)buttonRightClicked:(id)sender {
+  BrowserWindow::AvatarBubbleMode mode =
+      BrowserWindow::AVATAR_BUBBLE_MODE_FAST_USER_SWITCH;
 
   [self showAvatarBubbleAnchoredAt:button_
                           withMode:mode