Add instantiation declarations for PointBase, SizeBase, RectBase

ui/gfx/rect.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.
 
 // Defines a simple integer rectangle class.  The containment semantics
 // are array-like; that is, the coordinate (x, y) is considered to be
 // contained by the rectangle, but the coordinate (x + width, y) is not.
 // The class will happily let you create malformed rectangles (that is,
 // rectangles with negative width and/or height), but there will be assertions
 // in the operations (such as Contains()) to complain in this case.
@@ skipping 49 matching lines @@
 #elif defined(TOOLKIT_GTK)
   GdkRectangle ToGdkRectangle() const;
 #elif defined(OS_MACOSX)
   // Construct an equivalent CoreGraphics object.
   CGRect ToCGRect() const;
 #endif
 
   std::string ToString() const;
 };
 
+#if !defined(COMPILER_MSVC)
+extern template class RectBase<Rect, Point, Size, Insets, int>;
+#endif
+
 }  // namespace gfx
 
 #endif  // UI_GFX_RECT_H_