[rAC, OSX] Use a bubble for tooltips.

chrome/browser/ui/cocoa/autofill/autofill_bubble_controller.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_AUTOFILL_AUTOFILL_BUBBLE_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_AUTOFILL_AUTOFILL_BUBBLE_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
 #import "chrome/browser/ui/cocoa/base_bubble_controller.h"
 
 // Bubble controller for field validation error bubbles.
 @interface AutofillBubbleController : BaseBubbleController {
+ @private
    base::scoped_nsobject<NSTextField> label_;
+   NSSize inset_;  // Amount the label is inset from the window.
 }
 
 // Creates an error bubble with the given |message|. You need to call
 // -showWindow: to make the bubble visible. It will autorelease itself when the
 // user dismisses the bubble.
 - (id)initWithParentWindow:(NSWindow*)parentWindow
                    message:(NSString*)message;
 
+// Designated initializer. Creates a bubble with given |message| and insets the
+// text content by |inset|.
+- (id)initWithParentWindow:(NSWindow*)parentWindow
+                   message:(NSString*)message
+                     inset:(NSSize)inset;
+
 // Maximum width that the bubble will occupy, regardless of message size.
 - (CGFloat)maxWidth;
 
 @end
 
 
 #endif  // CHROME_BROWSER_UI_COCOA_AUTOFILL_AUTOFILL_BUBBLE_CONTROLLER_H_