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diff --git a/chrome/browser/cocoa/extensions/extension_popup_controller.h b/chrome/browser/cocoa/extensions/extension_popup_controller.h
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+++ b/chrome/browser/cocoa/extensions/extension_popup_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_EXTENSIONS_EXTENSION_POPUP_CONTROLLER_H_
+#define CHROME_BROWSER_COCOA_EXTENSIONS_EXTENSION_POPUP_CONTROLLER_H_
+
+#import <Cocoa/Cocoa.h>
+
+#import "base/scoped_nsobject.h"
+#include "base/scoped_ptr.h"
+#include "chrome/browser/cocoa/info_bubble_view.h"
+#include "googleurl/src/gurl.h"
+
+class Browser;
+class ExtensionHost;
+@class InfoBubbleWindow;
+
+// This controller manages a single browser action popup that can appear once a
+// user has clicked on a browser action button. It instantiates the extension
+// popup view showing the content and resizes the window to accomodate any size
+// changes as they occur.
+// There can only be one browser action popup open at a time.
+@interface ExtensionPopupController : NSWindowController {
+ @private
+  // The native extension view retrieved from the extension host. Weak.
+  NSView* extensionView_;
+
+  // The popup's parent window. Weak.
+  NSWindow* parentWindow_;
+
+  // Where the window is anchored. Right now it's the bottom center of the
+  // browser action button.
+  NSPoint anchor_;
+
+  // The extension host object.
+  scoped_ptr<ExtensionHost> host_;
+}
+
+// Returns a pointer to the extension host object associated with this
+// browser action.
+- (ExtensionHost*)host;
+
+// Starts the process of showing the given popup URL. Instantiates an
+// ExtensionPopupController with the parent window retrieved from |browser|, a
+// host for the popup created by the extension process manager specific to the
+// browser profile and the remaining arguments |anchoredAt| and |arrowLocation|.
+// |anchoredAt| is expected to be in the screen's coordinates at the bottom
+// center of the browser action button.
+// The actual display of the popup is delayed until the page contents finish
+// loading in order to minimize UI flashing and resizing.
++ (ExtensionPopupController*)showURL:(GURL)url
+                           inBrowser:(Browser*)browser
+                          anchoredAt:(NSPoint)anchoredAt
+                       arrowLocation:(BubbleArrowLocation)arrowLocation;
+@end
+
+#endif  // CHROME_BROWSER_COCOA_EXTENSIONS_EXTENSION_POPUP_CONTROLLER_H_