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diff --git a/chrome/browser/cocoa/extension_view_mac.h b/chrome/browser/cocoa/extension_view_mac.h
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+++ b/chrome/browser/cocoa/extension_view_mac.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_EXTENSION_VIEW_MAC_H_
+#define CHROME_BROWSER_COCOA_EXTENSION_VIEW_MAC_H_
+
+#include "base/basictypes.h"
+#include "base/gfx/native_widget_types.h"
+
+class Browser;
+class ExtensionHost;
+class RenderViewHost;
+class RenderWidgetHostViewMac;
+class SkBitmap;
+
+// This class represents extension views. An extension view internally contains
+// a bridge to an extension process, which draws to the extension view's
+// native view object through IPC.
+class ExtensionViewMac {
+ public:
+  ExtensionViewMac(ExtensionHost* extension_host, Browser* browser);
+  ~ExtensionViewMac();
+
+  // Starts the extension process and creates the native view. You must call
+  // this method before calling any of this class's other methods.
+  void Init();
+
+  // Returns the extension's native view.
+  gfx::NativeView native_view();
+
+  // Returns the browser the extension belongs to.
+  Browser* browser() const { return browser_; }
+
+  // Does this extension live as a toolstrip in an extension shelf?
+  bool is_toolstrip() const { return is_toolstrip_; }
+  void set_is_toolstrip(bool is_toolstrip) { is_toolstrip_ = is_toolstrip; }
+
+  // Sets the extensions's background image.
+  void SetBackground(const SkBitmap& background);
+
+  // Method for the ExtensionHost to notify us about the correct width for
+  // extension contents.
+  void UpdatePreferredWidth(int pref_width);
+
+ private:
+  RenderViewHost* render_view_host() const;
+
+  void CreateWidgetHostView();
+
+  // True if the contents are being displayed inside the extension shelf.
+  bool is_toolstrip_;
+
+  Browser* browser_;  // weak
+
+  ExtensionHost* extension_host_;  // weak
+
+  // Created by us, but owned by its |native_view()|. We |release| the
+  // rwhv's native view in our destructor, effectively freeing this.
+  RenderWidgetHostViewMac* render_widget_host_view_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionViewMac);
+};
+
+#endif  // CHROME_BROWSER_COCOA_EXTENSION_VIEW_MAC_H_