★ Record the image dominant color in the image database.

components/enhanced_bookmarks/image_store_util_ios.mm

 // 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.
 
 #include "components/enhanced_bookmarks/image_store_util.h"
 
 #import <UIKit/UIKit.h>
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/mac/scoped_nsobject.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/gfx/color_analysis.h"
 
 namespace {
 // An implementation of RefCountedMemory, where the bytes are stored in a
 // NSData. This class assumes the NSData is non mutable to avoid a copy.
 class RefCountedNSDataMemory : public base::RefCountedMemory {
  public:
   explicit RefCountedNSDataMemory(NSData* memory) : data_([memory retain]) {}
 
   const unsigned char* front() const override {
     return reinterpret_cast<const unsigned char*>([data_ bytes]);
@@ skipping 17 matching lines @@
   return scoped_refptr<RefCountedNSDataMemory>(new RefCountedNSDataMemory(
       [NSKeyedArchiver archivedDataWithRootObject:image.ToUIImage()]));
 }
 
 // Decodes the UIImage in the bytes and returns a gfx::Image.
 gfx::Image ImageForBytes(const scoped_refptr<base::RefCountedMemory>& data) {
   return gfx::Image([[NSKeyedUnarchiver unarchiveObjectWithData:
       [NSData dataWithBytes:data->front() length:data->size()]] retain]);
 }
 
+SkColor DominantColorForImage(const gfx::Image& image) {
+  return color_utils::CalculateKMeanColorOfBitmap(*image.ToSkBitmap());
+}
+
 }  // namespace enhanced_bookmarks