Add gfx::Image::Image(const SkBitmap&) constructor.

ui/gfx/image/image.h

Index: ui/gfx/image/image.h
diff --git a/ui/gfx/image/image.h b/ui/gfx/image/image.h
index d5e630b5915bc9a28741da3c88001e513d5c0b86..544d18a0367d77fbcd35fbddc49391d917f89c58 100644
--- a/ui/gfx/image/image.h
+++ b/ui/gfx/image/image.h
@@ -65,6 +65,10 @@ class UI_EXPORT Image {
   // ownership of the image.
   explicit Image(const SkBitmap* bitmap);
 
+  // Creates a new image by copying the bitmap for use as the default
+  // representation.
+  explicit Image(const SkBitmap& bitmap);
+
   // To create an Image that supports multiple resolutions pass a vector
   // of bitmaps, one for each resolution.
   explicit Image(const std::vector<const SkBitmap*>& bitmaps);