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diff --git a/chrome/browser/bubble_positioner.h b/chrome/browser/bubble_positioner.h
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+++ b/chrome/browser/bubble_positioner.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_BUBBLE_POSITIONER_H_
+#define CHROME_BROWSER_BUBBLE_POSITIONER_H_
+
+namespace gfx {
+class Rect;
+}
+
+// An object in the browser UI can implement this interface to provide display
+// bounds for the omnibox bubble and info bubble views.
+class BubblePositioner {
+ public:
+  // Returns the bounds of the "location bar" stack (including star/go buttons
+  // where relevant).  The omnibox dropdown uses this to calculate its width and
+  // y-coordinate, and views showing InfoBubbles use it to find the y-coordinate
+  // they should show at, so that all "bubble" UIs show up at the same vertical
+  // position.
+  virtual gfx::Rect GetLocationStackBounds() const = 0;
+};
+
+#endif  // CHROME_BROWSER_BUBBLE_POSITIONER_H_