Creates FaviconAttributesProvider.

ios/chrome/browser/favicon/favicon_attributes.h

+// Copyright 2016 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 IOS_CHROME_BROWSER_FAVICON_FAVICON_ATTRIBUTES_H_
+#define IOS_CHROME_BROWSER_FAVICON_FAVICON_ATTRIBUTES_H_
+
+#import <UIKit/UIKit.h>
+
+// Attributes of a favicon. A favicon is represented either with an image or

[jif, 2016/09/26 10:58:12]

Attributes of a FaviconView.

[stkhapugin, 2016/09/26 15:51:36]

No, these are a representation of favicon, not the view.

+// with a fallback monogram of a given color and background color.
+@interface FaviconAttributes : NSObject
+
+// Favicon image. Can be nil. If it is nil, monogram string and color are
+// guaranteed to be not nil.
+@property(nonatomic, readonly, strong, nullable) UIImage* faviconImage;
+// Favicon monogram. Only available when there is no image.
+@property(nonatomic, readonly, copy, nullable) NSString* monogramString;
+// Favicon monogram color. Only available when there is no image.
+@property(nonatomic, readonly, strong, nullable) UIColor* textColor;
+// Favicon monogram background color. Only available when there is no image.
+@property(nonatomic, readonly, strong, nullable) UIColor* backgroundColor;
+
++ (instancetype _Nonnull)attributesWithImage:(UIImage* _Nonnull)image;
++ (instancetype _Nonnull)attributesWithMonogram:(NSString* _Nonnull)monogram
+                                      textColor:(UIColor* _Nonnull)textColor
+                                backgroundColor:
+                                    (UIColor* _Nonnull)backgroundColor;
+
+// Designated initializer. Either |image| or all of |textColor|,
+// |backgroundColor| and |monogram| must be not nil.
+- (instancetype _Nonnull)initWithImage:(UIImage* _Nullable)image
+                              monogram:(NSString* _Nullable)monogram
+                             textColor:(UIColor* _Nullable)textColor
+                       backgroundColor:(UIColor* _Nullable)backgroundColor
+    NS_DESIGNATED_INITIALIZER;
+- (instancetype _Nonnull)initWithImage:(UIImage* _Nonnull)image;
+- (instancetype _Nonnull)initWithMonogram:(NSString* _Nonnull)monogram
+                                textColor:(UIColor* _Nonnull)textColor
+                          backgroundColor:(UIColor* _Nonnull)backgroundColor;
+
+- (instancetype _Nullable)init NS_UNAVAILABLE;
+@end
+
+#endif  // IOS_CHROME_BROWSER_FAVICON_FAVICON_ATTRIBUTES_H_