[iOS] Upstream WebP network client

components/webp_transcode/webp_network_client_factory.mm

+// 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.
+
+#import "components/webp_transcode/webp_network_client_factory.h"
+
+#include "base/logging.h"
+#include "base/sequenced_task_runner.h"
+#include "base/single_thread_task_runner.h"
+#import "components/webp_transcode/webp_network_client.h"
+
+@interface WebPNetworkClientFactory () {
+  scoped_refptr<base::SequencedTaskRunner> _taskRunner;
+}
+@end
+
+@implementation WebPNetworkClientFactory
+
+- (instancetype)init {
+  NOTREACHED() << "Use |-initWithTaskRunner:| instead";
+  return nil;
+}
+
+- (Class)clientClass {
+  return [WebPNetworkClient class];
+}
+
+- (instancetype)initWithTaskRunner:
+    (const scoped_refptr<base::SequencedTaskRunner>&)runner {
+  if ((self = [super init])) {
+    DCHECK(runner);
+    _taskRunner = runner;
+  }
+  return self;
+}
+
+- (CRNForwardingNetworkClient*)clientHandlingAnyRequest {
+  return
+      [[[WebPNetworkClient alloc] initWithTaskRunner:_taskRunner] autorelease];
+}
+
+@end