Clamp dialog bounds to be fully visible on the nearest display

ui/display/screen.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 UI_DISPLAY_SCREEN_H_
 #define UI_DISPLAY_SCREEN_H_
 
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 20 matching lines @@
   Screen();
   virtual ~Screen();
 
   // Retrieves the single Screen object.
   static Screen* GetScreen();
 
   // Sets the global screen. NOTE: this does not take ownership of |screen|.
   // Tests must be sure to reset any state they install.
   static void SetScreenInstance(Screen* instance);
 
+  // If the given |screen_rect| isn't fully on any display, return a rect that
+  // is fully within the bounds of the work area for the nearest display. If
+  // the rect is already fully on a display, no changes are made.
+  static gfx::Rect MoveScreenRectToNearestDisplay(
+      const gfx::Rect& screen_rect);
+
   // Returns the current absolute position of the mouse pointer.
   virtual gfx::Point GetCursorScreenPoint() = 0;
 
   // Returns true if the cursor is directly over |window|.
   virtual bool IsWindowUnderCursor(gfx::NativeWindow window) = 0;
 
   // Returns the window at the given screen coordinate |point|.
   virtual gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) = 0;
 
   // Returns the number of displays.
@@ skipping 45 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Screen);
 };
 
 Screen* CreateNativeScreen();
 
 }  // namespace display
 
 #endif  // UI_DISPLAY_SCREEN_H_