Allow load_library_from_apk to be set via gn args

build/config/android/rules.gni

 # 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.
 
 import("//base/android/linker/config.gni")
 import("//build/config/android/config.gni")
 import("//build/config/android/internal_rules.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/toolchain/toolchain.gni")
 import("//third_party/android_platform/config.gni")
@@ skipping 1299 matching lines @@
     _keystore_name = invoker.keystore_name
     _keystore_password = invoker.keystore_password
   }
 
   _srcjar_deps = []
   if (defined(invoker.srcjar_deps)) {
     _srcjar_deps += invoker.srcjar_deps
   }
 
   _use_chromium_linker =
-      defined(invoker.use_chromium_linker) && invoker.use_chromium_linker &&
-      chromium_linker_supported
-  _enable_relocation_packing =
-      defined(invoker.enable_relocation_packing) &&
-      invoker.enable_relocation_packing && _use_chromium_linker
+      defined(invoker.use_chromium_linker) && invoker.use_chromium_linker
+  _enable_relocation_packing = defined(invoker.enable_relocation_packing) &&
+                               invoker.enable_relocation_packing
   _load_library_from_apk =
       defined(invoker.load_library_from_apk) && invoker.load_library_from_apk
 
   assert(_use_chromium_linker || true)  # Mark as used.
-  assert(_enable_relocation_packing || true)  # Mark as used.
-
-  assert(
-      !_load_library_from_apk || _use_chromium_linker,
-      "Loading library from the apk requires use" + " of the Chromium linker.")
+  if (_enable_relocation_packing) {
+    assert(_use_chromium_linker,
+           "enable_relocation_packing requires use_chromium_linker")
+  }
+  if (_load_library_from_apk) {
+    assert(_use_chromium_linker,
+           "load_library_from_apk requires use_chromium_linker")
+  }
 
   # The dependency that makes the chromium linker, if any is needed.
   _native_libs_deps = []
 
   if (defined(invoker.native_libs) && invoker.native_libs != []) {
     if (is_component_build || is_asan) {
       _native_libs += [ "$root_shlib_dir/libc++_shared.so" ]
       _native_libs_deps += [ "//build/android:cpplib_stripped" ]
     }
 
@@ skipping 940 matching lines @@
   }
 
   android_library(target_name) {
     java_files = []
     srcjar_deps = [ ":${_template_name}__protoc_java" ]
     deps = [
       "//third_party/android_protobuf:protobuf_nano_javalib",
     ]
   }
 }