Move GdkPixbufFromSkBitmap to gtk_util so it can easily be shared.

base/gfx/gtk_util.h

Index: base/gfx/gtk_util.h
diff --git a/base/gfx/gtk_util.h b/base/gfx/gtk_util.h
index 7062d59f8f0fc2ae82f287ccdb21bf0ffb031ea6..9d0a45ced974d58c75e6609ffc3c76c5e3b49efc 100755
--- a/base/gfx/gtk_util.h
+++ b/base/gfx/gtk_util.h
@@ -7,6 +7,7 @@
 
 #include <vector>
 
+typedef struct _GdkPixbuf GdkPixbuf;
 typedef struct _GdkRegion GdkRegion;
 
 namespace gfx {
@@ -17,6 +18,10 @@ class Rect;
 void SubtractRectanglesFromRegion(GdkRegion* region,
                                   const std::vector<gfx::Rect>& cutouts);
 
+// Convert and copy a SkBitmap to a GdkPixbuf.  NOTE: This is an expensive
+// operation, all of the pixels must be copied and their order swapped.
+GdkPixbuf* GdkPixbufFromSkBitmap(const SkBitmap* bitmap);
+
 }  // namespace gfx
 
 #endif  // BASE_GFX_GTK_UTIL_H_