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

ui/gfx/image/image.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.
 
 // An Image wraps an image any flavor, be it platform-native GdkBitmap/NSImage,
 // or a SkBitmap. This also provides easy conversion to other image types
 // through operator overloading. It will cache the converted representations
 // internally to prevent double-conversion.
 //
 // The lifetime of both the initial representation and any converted ones are
@@ skipping 47 matching lines @@
 
   typedef std::map<RepresentationType, internal::ImageRep*> RepresentationMap;
 
   // Creates an empty image with no representations.
   Image();
 
   // Creates a new image with the default representation. The object will take
   // 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);
 
 #if defined(TOOLKIT_USES_GTK)
   // Does not increase |pixbuf|'s reference count; expects to take ownership.
   explicit Image(GdkPixbuf* pixbuf);
 #elif defined(OS_MACOSX)
   // Does not retain |image|; expects to take ownership.
   // A single NSImage object can contain multiple bitmaps so there's no reason
@@ skipping 83 matching lines @@
   // be cheaply copied.
   scoped_refptr<internal::ImageStorage> storage_;
 
   friend class ::ImageTest;
   friend class ::ImageMacTest;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_IMAGE_IMAGE_H_