Create the IOSImageDataFetcher

components/image_fetcher/ios/BUILD.gn

Index: components/image_fetcher/ios/BUILD.gn
diff --git a/components/image_fetcher/ios/BUILD.gn b/components/image_fetcher/ios/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..91f3c5d5c4a88fbc000ceeb90fa2c2d48c4b8f7d
--- /dev/null
+++ b/components/image_fetcher/ios/BUILD.gn
@@ -0,0 +1,17 @@
+# Copyright 2017 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.
+
+source_set("ios") {
+  configs += [ "//build/config/compiler:enable_arc" ]
+  sources = [
+    "ios_image_data_fetcher.h",
+    "ios_image_data_fetcher.mm",
+  ]
+  deps = [
+    "//base",
+    "//components/image_fetcher",
+    "//ios/web/public/image_fetcher",
+    "//net",
+  ]
+}