[iOS][MF] Add icon for addresses

This adds the icon that will be used for addresses in manual fallback.

Bug: 845472
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I8790ac81cf35e82a059f80e08114fa81ff9dc679
Reviewed-on: https://chromium-review.googlesource.com/1163503Reviewed-by: Eric Noyau <noyau@chromium.org>
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581213}

ios/chrome/browser/ui/autofill/manual_fill/resources/BUILD.gn

+# Copyright 2018 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("//build/config/ios/asset_catalog.gni")
+
+imageset("addresses") {
+  sources = [
+    "addresses.imageset/Contents.json",
+    "addresses.imageset/addresses.png",
+    "addresses.imageset/addresses@2x.png",
+    "addresses.imageset/addresses@3x.png",
+  ]
+}

ios/chrome/browser/ui/autofill/manual_fill/resources/addresses.imageset/Contents.json

+{
+    "images": [
+        {
+            "idiom": "universal",
+            "scale": "1x",
+            "filename": "addresses.png"
+        },
+        {
+            "idiom": "universal",
+            "scale": "2x",
+            "filename": "addresses@2x.png"
+        },
+        {
+            "idiom": "universal",
+            "scale": "3x",
+            "filename": "addresses@3x.png"
+        }
+    ],
+    "info": {
+        "version": 1,
+        "author": "xcode"
+    }
+}