[Suggestions] Introduce a different image encoder/decoder for iOS

components/suggestions/BUILD.gn

 # 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.
 
 static_library("suggestions") {
   sources = [
     "blacklist_store.cc",
     "blacklist_store.h",
     "image_fetcher.h",
     "image_fetcher_delegate.h",
@@ skipping 12 matching lines @@
   deps = [
     "//base",
     "//components/keyed_service/core",
     "//components/pref_registry",
     "//components/suggestions/proto",
     "//components/variations",
     "//net",
     "//ui/gfx",
     "//url",
   ]
+
+  if (is_ios) {
+    sources += [
+      "image_encoder_ios.h",
+      "image_encoder_ios.mm",
+    ]
+  } else {
+    sources += [
+      "image_encoder.cc",
+      "image_encoder.h",
+    ]
+  }
 }