Move PlatformScreen, PlatformScreenChromium, and Widget to Source/platform

Source/platform/PlatformScreen.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 #include "platform/geometry/FloatRect.h"
 #include "wtf/Forward.h"
 #include "wtf/RefPtr.h"
 
 typedef uint32_t PlatformDisplayID;
 
 typedef WTF::Vector<char> ColorProfile;
 
 namespace WebCore {
 
-    class FloatRect;
-    class Widget;
+class FloatRect;
+class Widget;
 
-    int screenDepth(Widget*);
-    int screenDepthPerComponent(Widget*);
-    bool screenIsMonochrome(Widget*);
+PLATFORM_EXPORT int screenDepth(Widget*);
+PLATFORM_EXPORT int screenDepthPerComponent(Widget*);
+PLATFORM_EXPORT bool screenIsMonochrome(Widget*);
 
-    FloatRect screenRect(Widget*);
-    FloatRect screenAvailableRect(Widget*);
-    void screenColorProfile(ColorProfile&);
+PLATFORM_EXPORT FloatRect screenRect(Widget*);
+PLATFORM_EXPORT FloatRect screenAvailableRect(Widget*);
+PLATFORM_EXPORT void screenColorProfile(ColorProfile&);
+
 } // namespace WebCore
 
 #endif // PlatformScreen_h