GN + Android: support standalone .dex.jar output of Android libraries.

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 d33c2003308a6d0b09917047a1a8266413ef1b65..f0fd9730a1f46680e17a98d4eb9315fd4fe39b3e 100644
--- a/build/config/android/internal_rules.gni
+++ b/build/config/android/internal_rules.gni
@@ -811,6 +811,17 @@ template("java_library_impl") {
       sources = [_jar_path]
       output = _dex_path
     }
+
+    if (defined(invoker.standalone_dex_path)) {
+      _final_deps += [ ":${_template_name}__standalone_dex" ]
+      _rebased_build_config = rebase_path(_build_config, root_build_dir)
+      dex("${_template_name}__standalone_dex") {
+        sources = [_jar_path]

[cjhopman, 2014/12/01 21:47:07]

add:

inputs = [ _build_config ]

[ppi, 2014/12/02 16:28:17]

Done.

+        output = invoker.standalone_dex_path
+        dex_arg_key = "${_rebased_build_config}:final_dex:dependency_dex_files"
+        args = [ "--inputs=@FileArg($dex_arg_key)" ]
+      }
+    }
   }
 
   group(target_name) {