Add tooltips to profile name when truncated

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

Index: chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
diff --git a/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm b/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
index 2c8a22324cf495473a723774790156fe4271c5b1..d94b14670f3a8605485a6de910c04131e75e38af 100644
--- a/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
+++ b/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm
@@ -701,6 +701,13 @@ class ActiveProfileObserverBridge : public AvatarMenuObserver,
           IDS_PROFILES_NEW_AVATAR_MENU_EDIT_NAME_ACCESSIBLE_NAME,
           base::SysNSStringToUTF16(profileName))
                                     forAttribute:NSAccessibilityTitleAttribute];
+
+      NSSize textSize = [profileName sizeWithAttributes:@{
+        NSFontAttributeName : [profileNameTextField_ font]
+      }];
+
+      if (textSize.width > frameRect.size.width - [hoverImage size].width * 2)
+        [self setToolTip:profileName];
     }
 
     [[self cell] accessibilitySetOverrideValue:NSAccessibilityButtonRole
@@ -1805,6 +1812,16 @@ class ActiveProfileObserverBridge : public AvatarMenuObserver,
   [profileButton setTarget:self];
   [profileButton setAction:@selector(switchToProfile:)];
 
+  NSSize textSize = [[profileButton title] sizeWithAttributes:@{
+    NSFontAttributeName : [profileButton font]
+  }];
+
+  CGFloat availableWidth = rect.size.width - kSmallImageSide -
+                           kImageTitleSpacing - kHorizontalSpacing;
+
+  if (std::ceil(textSize.width) > availableWidth)
+    [profileButton setToolTip:[profileButton title]];
+
   return profileButton.autorelease();
 }