[iOS] Upstream WebP network client

components/webp_transcode/webp_network_client.h

+// Copyright 2013 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_WEBP_TRANSCODE_WEBP_NETWORK_CLIENT_H_
+#define COMPONENTS_WEBP_TRANSCODE_WEBP_NETWORK_CLIENT_H_
+
+#import <Foundation/Foundation.h>
+
+#include "base/memory/ref_counted.h"
+#import "ios/net/clients/crn_forwarding_network_client.h"
+#import "ios/net/clients/crn_forwarding_network_client_factory.h"
+
+// Network client that decodes WebP images.
+@interface WebPNetworkClient : CRNForwardingNetworkClient
+
+// |runner| is the task runner used to perform the image decoding.
+// Designated initializer.
+- (instancetype)initWithTaskRunner:
+    (const scoped_refptr<base::SequencedTaskRunner>&)runner;
+
+@end
+
+#endif  // COMPONENTS_WEBP_TRANSCODE_WEBP_NETWORK_CLIENT_H_