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

ui/gfx/image/image.cc

Index: ui/gfx/image/image.cc
diff --git a/ui/gfx/image/image.cc b/ui/gfx/image/image.cc
index 61a84e74ec3278dbb8beea5f0909c5cb7d7619e5..e2eeadfec11382d00db8990cc9436b35ec778d4f 100644
--- a/ui/gfx/image/image.cc
+++ b/ui/gfx/image/image.cc
@@ -243,6 +243,13 @@ Image::Image(const SkBitmap* bitmap)
   AddRepresentation(rep);
 }
 
+Image::Image(const SkBitmap& bitmap)
+    : storage_(new internal::ImageStorage(Image::kImageRepSkia)) {
+  internal::ImageRepSkia* rep =
+      new internal::ImageRepSkia(new SkBitmap(bitmap));
+  AddRepresentation(rep);
+}
+
 Image::Image(const std::vector<const SkBitmap*>& bitmaps)
     : storage_(new internal::ImageStorage(Image::kImageRepSkia)) {
   internal::ImageRepSkia* rep = new internal::ImageRepSkia(bitmaps);