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diff --git a/chrome/browser/cocoa/hung_renderer_controller.h b/chrome/browser/cocoa/hung_renderer_controller.h
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+++ b/chrome/browser/cocoa/hung_renderer_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_COCOA_HUNG_RENDERER_CONTROLLER_H_
+#define CHROME_BROWSER_COCOA_HUNG_RENDERER_CONTROLLER_H_
+
+// A controller for the Mac hung renderer dialog window.  Only one
+// instance of this controller can exist at any time, although a given
+// controller is destroyed when its window is closed.
+//
+// The dialog itself displays a list of frozen tabs, all of which
+// share a render process.  Since there can only be a single dialog
+// open at a time, if showForTabContents is called for a different
+// tab, the dialog is repurposed to show a warning for the new tab.
+//
+// The caller is required to call endForTabContents before deleting
+// any TabContents object.
+
+#import <Cocoa/Cocoa.h>
+
+#include <vector>
+
+@interface HungRendererController : NSWindowController {
+ @private
+  IBOutlet NSButton* waitButton_;
+  IBOutlet NSButton* killButton_;
+  IBOutlet NSTableView* tableView_;
+
+  // The TabContents for which this dialog is open.  Should never be
+  // NULL while this dialog is open.
+  TabContents* hungContents_;
+
+  // Backing data for |tableView_|.  Contains a list of all
+  // TabContents that share a renderer process with |hungContents_|.
+  std::vector<TabContents*> hungRenderers_;
+}
+
+// Kills the hung renderers.
+- (IBAction)kill:(id)sender;
+
+// Waits longer for the renderers to respond.
+- (IBAction)wait:(id)sender;
+
+// Modifies the dialog to show a warning for the given tab contents.
+// The dialog will contain a list of all tabs that share a renderer
+// process with |contents|.  The caller must not delete any tab
+// contents without first calling endForTabContents.
+- (void)showForTabContents:(TabContents*)contents;
+
+// Notifies the dialog that |contents| is either responsive or closed.
+// If |contents| shares the same render process as the tab contents
+// this dialog was created for, this function will close the dialog.
+// If |contents| has a different process, this function does nothing.
+- (void)endForTabContents:(TabContents*)contents;
+
+@end  // HungRendererController
+
+
+@interface HungRendererController (JustForTesting)
+- (NSButton*)killButton;
+- (NSButton*)waitButton;
+@end
+
+#endif  // CHROME_BROWSER_COCOA_HUNG_RENDERER_CONTROLLER_H_