GN: asset_location -> android_assets() for html_viewer

build/config/android/internal_rules.gni

Index: build/config/android/internal_rules.gni
diff --git a/build/config/android/internal_rules.gni b/build/config/android/internal_rules.gni
index 3d91676e9f4b641d9c182ef1c0d9e88dc406a615..ce158eff6a0f75ca011227f117bde863db4ea991 100644
--- a/build/config/android/internal_rules.gni
+++ b/build/config/android/internal_rules.gni
@@ -667,6 +667,8 @@ template("emma_instr") {
 #   native_lib_placeholders: List of placeholder filenames to add to the apk
 #     (optional).
 #   native_libs_dir: Directory containing native libraries.
+#   write_asset_list: Adds an extra file to the assets, which contains a list of
+#     all other asset files.
 template("package_apk") {
   action(target_name) {
     forward_variables_from(invoker,
@@ -717,6 +719,9 @@ template("package_apk") {
         "--uncompressed-assets=@FileArg($_rebased_build_config:uncompressed_assets)",
       ]
     }
+    if (defined(invoker.write_asset_list) && invoker.write_asset_list) {
+      args += [ "--write-asset-list" ]
+    }
     if (defined(invoker.dex_path)) {
       _rebased_dex_path = rebase_path(invoker.dex_path, root_build_dir)
       args += [ "--dex-file=$_rebased_dex_path" ]
@@ -1009,6 +1014,7 @@ template("create_apk") {
                              "emma_instrument",
                              "native_lib_placeholders",
                              "native_libs_dir",
+                             "write_asset_list",
                            ])
     deps = _deps + [ ":${_package_resources_target_name}" ]