WebUI TaskManager: Add method to set minimum window size on HTMLDialog.

ui/views/widget/widget.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_VIEWS_WIDGET_WIDGET_H_
 #define UI_VIEWS_WIDGET_WIDGET_H_
 #pragma once
 
 #include <set>
 #include <stack>
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   // Returns the bounds of the Widget's client area in screen coordinates.
   gfx::Rect GetClientAreaScreenBounds() const;
 
   // Retrieves the restored bounds for the window.
   gfx::Rect GetRestoredBounds() const;
 
   // Sizes and/or places the widget to the specified bounds, size or position.
   void SetBounds(const gfx::Rect& bounds);
   void SetSize(const gfx::Size& size);
 
+  // Sizes the window to the specified size and centerizes it.
+  void CenterWindow(const gfx::Size& size);
+
   // Like SetBounds(), but ensures the Widget is fully visible on screen,
   // resizing and/or repositioning as necessary. This is only useful for
   // non-child widgets.
   void SetBoundsConstrained(const gfx::Rect& bounds);
 
   // Sets whether animations that occur when visibility is changed are enabled.
   // Default is true.
   void SetVisibilityChangedAnimationsEnabled(bool value);
 
   // Starts a nested message loop that moves the window. This can be used to
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   // duplicate move events even though the mouse hasn't moved.
   bool last_mouse_event_was_move_;
   gfx::Point last_mouse_event_position_;
 
   DISALLOW_COPY_AND_ASSIGN(Widget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_WIDGET_H_