Adding Wayland support for ui/gfx

ui/gfx/gtk_util.h

Index: ui/gfx/gtk_util.h
diff --git a/ui/gfx/gtk_util.h b/ui/gfx/gtk_util.h
index 5b802af1e619aa116ac7c5a2cfbf6f5a22831b88..33a69287c17bc37836c115fe4a2782a8522544dc 100644
--- a/ui/gfx/gtk_util.h
+++ b/ui/gfx/gtk_util.h
@@ -19,6 +19,8 @@ typedef struct _GdkPixbuf GdkPixbuf;
 typedef struct _GdkRegion GdkRegion;
 typedef struct _GdkCursor GdkCursor;
 
+typedef struct _PangoContext PangoContext;
+
 class CommandLine;
 class SkBitmap;
 
@@ -40,6 +42,9 @@ UI_API GdkPixbuf* GdkPixbufFromSkBitmap(const SkBitmap* bitmap);
 UI_API void SubtractRectanglesFromRegion(GdkRegion* region,
                                          const std::vector<Rect>& cutouts);
 
+// Creates and returns a PangoContext. The caller owns the context.
+PangoContext* GetPangoContext();
+
 // Returns the resolution (DPI) used by pango. A negative values means the
 // resolution hasn't been set.
 double GetPangoResolution();