★ Record the image dominant color in the image database.

components/enhanced_bookmarks/image_store_util.h

 // Copyright 2014 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.
 
 #ifndef COMPONENTS_ENHANCED_BOOKMARKS_IMAGE_STORE_UTIL_H_
 #define COMPONENTS_ENHANCED_BOOKMARKS_IMAGE_STORE_UTIL_H_
 
 #include "base/memory/ref_counted_memory.h"
+#include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/image/image.h"
 
 namespace enhanced_bookmarks {
 // The two methods below archive and unarchive an image to and from a bag of
 // bytes. There is no API on gfx::Image capable of doing it while preserving the
 // scale of the image.
 
 // Encode |image| to bytes, that can be decoded using the below |ImageForBytes|
 // function. If encoding fails, then returned scoped_refptr has NULL.
 scoped_refptr<base::RefCountedMemory> BytesForImage(const gfx::Image& image);
 
 // Decode the image bytes encoded by the above |BytesForImage| function and
 // returns a gfx::Image. If decoding fails, returns an empty image.
 gfx::Image ImageForBytes(const scoped_refptr<base::RefCountedMemory>& data);
 
+// Returns the dominant color for |image|. This method can be slow on very large
+// images.
+SkColor DominantColorForImage(const gfx::Image& image);
 }
 
 #endif  // COMPONENTS_ENHANCED_BOOKMARKS_IMAGE_STORE_UTIL_H_