Introduce ui.dll / libui.so for the component build.

ui/gfx/rect.h

 // Copyright (c) 2010 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 10 matching lines @@
 #if defined(OS_WIN)
 typedef struct tagRECT RECT;
 #elif defined(USE_X11)
 typedef struct _GdkRectangle GdkRectangle;
 #endif
 
 namespace gfx {
 
 class Insets;
 
-class Rect {
+class UI_API Rect {
  public:
   Rect();
   Rect(int width, int height);
   Rect(int x, int y, int width, int height);
 #if defined(OS_WIN)
   explicit Rect(const RECT& r);
 #elif defined(OS_MACOSX)
   explicit Rect(const CGRect& r);
 #elif defined(USE_X11)
   explicit Rect(const GdkRectangle& r);
@@ skipping 128 matching lines @@
 
   // Returns true if this rectangle shares an entire edge (i.e., same width or
   // same height) with the given rectangle, and the rectangles do not overlap.
   bool SharesEdgeWith(const gfx::Rect& rect) const;
 
  private:
   gfx::Point origin_;
   gfx::Size size_;
 };
 
-std::ostream& operator<<(std::ostream& out, const gfx::Rect& r);
+UI_API std::ostream& operator<<(std::ostream& out, const gfx::Rect& r);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RECT_H_