Mac App Launcher is positioned on center of dock in certain cases.

chrome/browser/ui/app_list/app_list_positioner.h

 // Copyright 2013 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_APP_LIST_APP_LIST_POSITIONER_H_
 #define CHROME_BROWSER_UI_APP_LIST_APP_LIST_POSITIONER_H_
 
 #include "ui/gfx/display.h"
 #include "ui/gfx/size.h"
 
@@ skipping 50 matching lines @@
   // anchor point will potentially position the window under it.
   gfx::Point GetAnchorPointForScreenCorner(ScreenCorner corner) const;
 
   // Finds the position for a window to anchor it to the corner of the shelf.
   // The window will be aligned to the left of the work area for horizontal
   // shelves, or to the top for vertical shelves. |shelf_edge| specifies the
   // location of the shelf. |shelf_edge| must not be SCREEN_EDGE_UNKNOWN.
   // Returns the intended coordinates for the center of the window.
   gfx::Point GetAnchorPointForShelfCorner(ScreenEdge shelf_edge) const;
 
+  // Finds the position for a window to anchor it to the center of the shelf.
+  // |shelf_edge| specifies the location of the shelf. It must not be
+  // SCREEN_EDGE_UNKNOWN. Returns the intended coordinates for the center of the
+  // window.
+  gfx::Point GetAnchorPointForShelfCenter(ScreenEdge shelf_edge) const;
+
   // Finds the position for a window to anchor it to the shelf at a point
   // closest to the user's mouse cursor. |shelf_edge| specifies the location of
   // the shelf; |cursor| specifies the location of the user's mouse cursor.
   // |shelf_edge| must not be SCREEN_EDGE_UNKNOWN. Returns the intended
   // coordinates for the center of the window.
   gfx::Point GetAnchorPointForShelfCursor(ScreenEdge shelf_edge,
                                           const gfx::Point& cursor) const;
 
   // Determines which edge of the screen the shelf is attached to. Returns
   // SCREEN_EDGE_UNKNOWN if the shelf is unavailable, hidden, or not on the
@@ skipping 16 matching lines @@
 
   // Size of the App List.
   gfx::Size window_size_;
 
   // The minimum distance, in pixels, to position the app list from the shelf
   // or edge of screen.
   int min_distance_from_edge_;
 };
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_APP_LIST_POSITIONER_H_