Adds GN rule & script for generating AndroidManifest.xml for APK splits

build/config/android/internal_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("//build/config/android/config.gni")
 
 assert(is_android)
 
 rebased_android_sdk = rebase_path(android_sdk, root_build_dir)
 rebased_android_sdk_root = rebase_path(android_sdk_root, root_build_dir)
@@ skipping 1159 matching lines @@
     ]
     output = invoker.dex_path
     dex_arg_key = "${rebased_build_config}:final_dex:dependency_dex_files"
     args = [ "--inputs=@FileArg($dex_arg_key)" ]
     if (defined(invoker.excluded_jars)) {
       excluded_jars = rebase_path(invoker.excluded_jars, root_build_dir)
       args += [ "--excluded-paths=${excluded_jars}" ]
     }
   }
 }
+
+# Creates an AndroidManifest.xml for an APK split.
+template("generate_split_manifest") {
+  assert(defined(invoker.main_manifest))
+  assert(defined(invoker.out_manifest))
+  assert(defined(invoker.split_name))
+
+  depfile = "$target_gen_dir/$target_name.d"
+  _args = [
+    "--main-manifest",
+    rebase_path(invoker.main_manifest, root_build_dir),
+    "--out-manifest",
+    rebase_path(invoker.out_manifest, root_build_dir),
+    "--split",
+    invoker.split_name,
+  ]
+  if (defined(invoker.version_code)) {
+    _args += [
+      "--version-code",
+      invoker.version_code,
+    ]
+  }
+  if (defined(invoker.version_name)) {
+    _args += [
+      "--version-name",
+      invoker.version_name,
+    ]
+  }
+  if (defined(invoker.has_code)) {
+    _args += [
+      "--has-code",
+      invoker.has_code,
+    ]
+  }
+  _args += [
+    "--depfile",
+    rebase_path(depfile, root_build_dir),
+  ]
+
+  action(target_name) {

[cjhopman, 2015/05/14 00:24:41]

nit: for templates that consist of a single action, I think it's best for
everything to be done within that action (that is, move this line to the
beginning of the template).

[agrieve, 2015/05/14 13:51:45]

Done.

+    script = "//build/android/gyp/generate_split_manifest.py"
+    outputs = [
+      depfile,
+      invoker.out_manifest,
+    ]
+    inputs = [
+      invoker.main_manifest,
+    ]
+    args = _args
+  }
+}