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diff --git a/chrome/browser/ui/cocoa/dev_tools_controller.h b/chrome/browser/ui/cocoa/dev_tools_controller.h
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+++ b/chrome/browser/ui/cocoa/dev_tools_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.
+
+#ifndef CHROME_BROWSER_UI_COCOA_DEV_TOOLS_CONTROLLER_H_
+#define CHROME_BROWSER_UI_COCOA_DEV_TOOLS_CONTROLLER_H_
+#pragma once
+
+#import <Foundation/Foundation.h>
+
+#include "base/scoped_nsobject.h"
+#import "chrome/browser/ui/cocoa/tab_contents_controller.h"
+
+@class NSSplitView;
+@class NSView;
+
+class TabContents;
+
+// A class that handles updates of the devTools view within a browser window.
+// It swaps in the relevant devTools contents for a given TabContents or removes
+// the vew, if there's no devTools contents to show.
+@interface DevToolsController : NSObject {
+ @private
+  // A view hosting docked devTools contents.
+  scoped_nsobject<NSSplitView> splitView_;
+
+  // Manages currently displayed devTools contents.
+  scoped_nsobject<TabContentsController> contentsController_;
+}
+
+- (id)initWithDelegate:(id<TabContentsControllerDelegate>)delegate;
+
+// This controller's view.
+- (NSView*)view;
+
+// The compiler seems to have trouble handling a function named "view" that
+// returns an NSSplitView, so provide a differently-named method.
+- (NSSplitView*)splitView;
+
+// Depending on |contents|'s state, decides whether the docked web inspector
+// should be shown or hidden and adjusts its height (|delegate_| handles
+// the actual resize).
+- (void)updateDevToolsForTabContents:(TabContents*)contents;
+
+// Call when the devTools view is properly sized and the render widget host view
+// should be put into the view hierarchy.
+- (void)ensureContentsVisible;
+
+@end
+
+#endif  // CHROME_BROWSER_UI_COCOA_DEV_TOOLS_CONTROLLER_H_