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diff --git a/chrome/browser/cocoa/base_bubble_controller.h b/chrome/browser/cocoa/base_bubble_controller.h
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+++ b/chrome/browser/cocoa/base_bubble_controller.h
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+// Copyright (c) 2010 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 <Cocoa/Cocoa.h>
+
+#import "base/cocoa_protocols_mac.h"
+#include "base/scoped_nsobject.h"
+#include "base/scoped_ptr.h"
+
+@class InfoBubbleView;
+
+// Base class for bubble controllers. Manages a xib that contains an
+// InfoBubbleWindow which contains an InfoBubbleView. Contains code to close
+// the bubble window on clicks outside of the window, and the like.
+// To use this class:
+// 1. Create a new xib that contains a window. Change the window's class to
+//    InfoBubbleWindow. Give it a child view that autosizes to the window's full
+//    size, give it class InfoBubbleView. Make the controller the window's
+//    delegate.
+// 2. Create a subclass of BaseBubbleController.
+// 3. Change the xib's File Owner to your subclass.
+// 4. Hook up the File Owner's |bubble_| to the InfoBubbleView in the xib.
+@interface BaseBubbleController : NSWindowController<NSWindowDelegate> {
+ @private
+  NSWindow* parentWindow_;  // weak
+  NSPoint anchor_;
+  IBOutlet InfoBubbleView* bubble_;  // to set arrow position
+}
+
+// Creates a bubble. |nibPath| is just the basename, e.g. @"FirstRunBubble".
+// |anchoredAt| is in screen space. You need to call -showWindow: to make the
+// bubble visible. It will autorelease itself when the user dismisses the
+// bubble.
+// This is the designated initializer.
+- (id)initWithWindowNibPath:(NSString*)nibPath
+               parentWindow:(NSWindow*)parentWindow
+                 anchoredAt:(NSPoint)anchoredAt;
+
+
+// Creates a bubble. |nibPath| is just the basename, e.g. @"FirstRunBubble".
+// |view| must be in a window. The bubble will point at |offset| relative to
+// |view|'s lower left corner. You need to call -showWindow: to make the
+// bubble visible. It will autorelease itself when the user dismisses the
+// bubble.
+- (id)initWithWindowNibPath:(NSString*)nibPath
+             relativeToView:(NSView*)view
+                     offset:(NSPoint)offset;
+
+
+@property (nonatomic, readonly) InfoBubbleView* bubble;
+
+@end