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diff --git a/chrome/browser/ui/cocoa/tab_contents_controller.h b/chrome/browser/ui/cocoa/tab_contents_controller.h
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+++ b/chrome/browser/ui/cocoa/tab_contents_controller.h
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+// Copyright (c) 2009 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_TAB_CONTENTS_CONTROLLER_H_
+#define CHROME_BROWSER_UI_COCOA_TAB_CONTENTS_CONTROLLER_H_
+#pragma once
+
+#include <Cocoa/Cocoa.h>
+
+#include "base/scoped_ptr.h"
+
+class TabContents;
+class TabContentsNotificationBridge;
+@class TabContentsController;
+
+// The interface for the tab contents view controller's delegate.
+
+@protocol TabContentsControllerDelegate
+
+// Tells the delegate when the tab contents view's frame is about to change.
+- (void)tabContentsViewFrameWillChange:(TabContentsController*)source
+                             frameRect:(NSRect)frameRect;
+
+@end
+
+// A class that controls the TabContents view. It manages displaying the
+// native view for a given TabContents.
+// Note that just creating the class does not display the view. We defer
+// inserting it until the box is the correct size to avoid multiple resize
+// messages to the renderer. You must call |-ensureContentsVisible| to display
+// the render widget host view.
+
+@interface TabContentsController : NSViewController {
+ @private
+  TabContents* contents_;  // weak
+  // Delegate to be notified about size changes.
+  id<TabContentsControllerDelegate> delegate_;  // weak
+  scoped_ptr<TabContentsNotificationBridge> tabContentsBridge_;
+}
+@property(readonly, nonatomic) TabContents* tabContents;
+
+- (id)initWithContents:(TabContents*)contents
+              delegate:(id<TabContentsControllerDelegate>)delegate;
+
+// Call when the tab contents is about to be replaced with the currently
+// selected tab contents to do not trigger unnecessary content relayout.
+- (void)ensureContentsSizeDoesNotChange;
+
+// Call when the tab view is properly sized and the render widget host view
+// should be put into the view hierarchy.
+- (void)ensureContentsVisible;
+
+// Call to change the underlying tab contents object. View is not changed,
+// call |-ensureContentsVisible| to display the |newContents|'s render widget
+// host view.
+- (void)changeTabContents:(TabContents*)newContents;
+
+// Called when the tab contents is the currently selected tab and is about to be
+// removed from the view hierarchy.
+- (void)willBecomeUnselectedTab;
+
+// Called when the tab contents is about to be put into the view hierarchy as
+// the selected tab. Handles things such as ensuring the toolbar is correctly
+// enabled.
+- (void)willBecomeSelectedTab;
+
+// Called when the tab contents is updated in some non-descript way (the
+// notification from the model isn't specific). |updatedContents| could reflect
+// an entirely new tab contents object.
+- (void)tabDidChange:(TabContents*)updatedContents;
+
+@end
+
+#endif  // CHROME_BROWSER_UI_COCOA_TAB_CONTENTS_CONTROLLER_H_