Add a way to fetch window frame metrics from NativeShellWindow

chrome/browser/ui/base_window.h

 // Copyright (c) 2012 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_BASE_WINDOW_H_
 #define CHROME_BROWSER_UI_BASE_WINDOW_H_
 
 #include "base/compiler_specific.h"
 #include "ui/gfx/native_widget_types.h"
 
@@ skipping 61 matching lines @@
 
   // Sets the window's size and position to the specified values.
   virtual void SetBounds(const gfx::Rect& bounds) = 0;
 
   // Flashes the taskbar item associated with this window.
   // Set |flash| to true to initiate flashing, false to stop flashing.
   virtual void FlashFrame(bool flash) = 0;
 
   // Returns true if a window is set to be always on top.
   virtual bool IsAlwaysOnTop() const = 0;
+
+  // Converts from window bounds (i.e. including window decorations) to content
+  // bounds (i.e. not including window decorations).
+  virtual gfx::Rect ContentBoundsForWindowBounds(
+      const gfx::Rect& window_bounds) const = 0;
+
+  // Converts from content bounds (i.e. not including window decorations) to
+  // window bounds (i.e. including window decorations).
+  virtual gfx::Rect WindowBoundsForContentBounds(
+      const gfx::Rect& content_bounds) const = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_BASE_WINDOW_H_