macOS: Setting focus to the first profile in profile switcher

chrome/browser/ui/cocoa/profiles/profile_chooser_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/profile_chooser_controller.h"
 
 #import <Carbon/Carbon.h>  // kVK_Return.
 #import <Cocoa/Cocoa.h>
 #include <stddef.h>
 
@@ skipping 1576 matching lines @@
       } else if (viewMode_ == profiles::BUBBLE_VIEW_MODE_PROFILE_CHOOSER) {
         tutorialView = [self buildTutorialViewIfNeededForItem:item];
       }
       currentProfileView =
           switches::IsMaterialDesignUserMenu()
               ? [self createMaterialDesignCurrentProfileView:item]
               : [self createCurrentProfileView:item];
       showLock = item.signed_in &&
           profiles::IsLockAvailable(browser_->profile());
     } else {
-      [otherProfiles addObject:[self createOtherProfileView:i]];
+      NSButton* otherProfileView = [self createOtherProfileView:i];
+      if (!firstProfileView_) {
+        firstProfileView_ = otherProfileView;
+      }
+      [otherProfiles addObject:otherProfileView];
     }
   }
   if (!currentProfileView)  // Guest windows don't have an active profile.
     currentProfileView = [self createGuestProfileView];
 
   // |yOffset| is the next position at which to draw in |container|
   // coordinates. Add a pixel offset so that the bottom option buttons don't
   // overlap the bubble's rounded corners.
   CGFloat yOffset = 1;
 
@@ skipping 1330 matching lines @@
   serviceType_ = signin::GAIA_SERVICE_TYPE_NONE;
 }
 
 - (bool)shouldShowGoIncognito {
   bool incognitoAvailable =
       IncognitoModePrefs::GetAvailability(browser_->profile()->GetPrefs()) !=
           IncognitoModePrefs::DISABLED;
   return incognitoAvailable && !browser_->profile()->IsGuestSession();
 }
 
+- (void)showWindow:(id)sender {
+  [super showWindow:sender];
+  NSEvent *event = [[NSApplication sharedApplication] currentEvent];
+  if (firstProfileView_ && [event type] == NSKeyDown) {
+    [[self window] makeFirstResponder:firstProfileView_];
+  }
+}
+
 @end