Adds a gfx_export.h to ui/gfx and converts all code in ui/gfx to

ui/gfx/pango_util.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_GFX_PANGO_UTIL_H_
 #define UI_GFX_PANGO_UTIL_H_
 
 #include <cairo/cairo.h>
 #include <pango/pango.h>
 #include <string>
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "base/strings/string16.h"
 #include "third_party/skia/include/core/SkColor.h"
-#include "ui/base/ui_export.h"
+#include "ui/gfx/gfx_export.h"
 
 typedef struct _PangoContext PangoContext;
 
 namespace gfx {
 
 class Font;
 class PlatformFontPango;
 class Rect;
 
 // Creates and returns a PangoContext. The caller owns the context.
@@ skipping 80 matching lines @@
 size_t GetPangoFontSizeInPixels(PangoFontDescription* pango_font);
 
 // Retrieves the Pango metrics for a Pango font description. Caches the metrics
 // and never frees them. The metrics objects are relatively small and very
 // expensive to look up.
 PangoFontMetrics* GetPangoFontMetrics(PangoFontDescription* desc);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_PANGO_UTIL_H_