Add keep_cronet_api.xml to keep @string/CronetProviderClassName

components/cronet/android/BUILD.gn

 # Copyright 2015 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/buildflag_header.gni")
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//build/util/process_version.gni")
 import("//build/util/version.gni")
 import("//testing/test.gni")
@@ skipping 1376 matching lines @@
   outputs = [
     "$_test_package_dir/assets/test_files/net/data/ssl/certificates/{{source_file_part}}",
   ]
   deps = [
     # Not really dependent, but builds can fail if these two targets attempt
     # to create the "assets" subdirectory simultaneously.
     ":cronet_package_copy_test_assets",
   ]
 }
 
+copy("cronet_package_copy_resources") {
+  sources = [
+    "api/res/raw/keep_cronet_api.xml",
+  ]
+  outputs = [
+    "$_package_dir/res/raw/{{source_file_part}}",
+  ]
+}
+
 # Enforce that ARM Neon is not used when building for ARMv7
 if (target_cpu == "arm" && arm_version == 7 && !arm_use_neon) {
   action("enforce_no_neon") {
     script = "//components/cronet/tools/check_no_neon.py"
     outputs = [
       "$target_gen_dir/$target_name.stamp",
     ]
     args = [
       rebase_path("${android_tool_prefix}objdump", root_build_dir),
 
@@ skipping 59 matching lines @@
   # Enforce building with ICU alternatives, crbug.com/611621.
   # Enforce that arm_use_neon==false when building for ARMv7 by
   # not including any deps in cronet_package target otherwise.
   if (use_platform_icu_alternatives &&
       (!(target_cpu == "arm" && arm_version == 7) || !arm_use_neon)) {
     deps = [
       ":api_static_checks",
       ":cronet_package_copy",
       ":cronet_package_copy_native_lib",
       ":cronet_package_copy_native_lib_unstripped",
+      ":cronet_package_copy_resources",
       ":cronet_test_package",
       ":generate_javadoc",
       ":generate_licenses",
       ":jar_cronet_api_source",
       ":jar_cronet_impl_common_java_source",
       ":jar_cronet_impl_native_java_source",
       ":jar_cronet_impl_platform_java_source",
       ":jar_cronet_sample_source",
       ":repackage_extracted_jars",
     ]
@@ skipping 11 matching lines @@
     deps = [
       ":cronet_package_copy_native_test_lib",
       ":cronet_package_copy_native_test_lib_unstripped",
       ":cronet_package_copy_test_assets",
       ":cronet_package_copy_test_files",
       ":cronet_package_copy_test_support_apks",
       ":repackage_extracted_test_jars",
     ]
   }
 }