Initial work to move downloads to ContentIds

components/offline_items_collection/core/BUILD.gn

 # 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.
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
 static_library("core") {
@@ skipping 41 matching lines @@
     ":core",
     "//base/test:test_support",
     "//components/offline_items_collection/core/test_support",
   ]
 }
 
 if (is_android) {
   android_library("core_java") {
     java_files = [
       "android/java/src/org/chromium/components/offline_items_collection/ContentId.java",
+      "android/java/src/org/chromium/components/offline_items_collection/LegacyHelpers.java",
       "android/java/src/org/chromium/components/offline_items_collection/OfflineContentAggregatorBridge.java",
       "android/java/src/org/chromium/components/offline_items_collection/OfflineContentProvider.java",
       "android/java/src/org/chromium/components/offline_items_collection/OfflineItem.java",
       "android/java/src/org/chromium/components/offline_items_collection/OfflineItemBridge.java",
     ]
 
     srcjar_deps = [ ":jni_enums" ]
 
     deps = [
       "//base:base_java",
@@ skipping 14 matching lines @@
 
   java_cpp_enum("jni_enums") {
     visibility = [ ":*" ]
 
     sources = [
       "offline_item_filter.h",
       "offline_item_state.h",
     ]
   }
 }