Add template to compile plist files.

build/config/mac/base_rules.gni

Index: build/config/mac/base_rules.gni
diff --git a/build/config/mac/base_rules.gni b/build/config/mac/base_rules.gni
index 8adb6cca5205192f943390a4afb3e5f629d17bc8..074074eb347f1eb73e1b31e32a7a6f4711ebd52c 100644
--- a/build/config/mac/base_rules.gni
+++ b/build/config/mac/base_rules.gni
@@ -56,48 +56,41 @@ template("convert_plist") {
   }
 }
 
-# The base template used to generate Info.plist files for iOS and Mac apps and
-# frameworks.
+# Template to merge multiple plist files and perform variable substitutions.
 #
 # Arguments
 #
 #     plist_templates:
 #         string array, paths to plist files which will be used for the bundle.
 #
-#     executable_name:
-#         string, name of the generated target used for the product
-#         and executable name as specified in the output Info.plist.
-#
 #     format:
 #         string, the format to `plutil -convert` the plist to when
 #         generating the output.
 #
-#     extra_substitutions:
-#         (optional) string array, 'key=value' pairs for extra fields which are
-#         specified in a source Info.plist template.
+#     substitutions:
+#         string array, 'key=value' pairs used to replace ${key} by value
+#         when generating the output plist file.
 #
 #     output_name:
-#         (optional) string, name of the generated plist file, default to
-#         "$target_gen_dir/$target_name.plist".
-template("info_plist") {
+#         string, name of the generated plist file.
+template("compile_plist") {
   assert(defined(invoker.plist_templates),
          "A list of template plist files must be specified for $target_name")
-  assert(defined(invoker.executable_name),
-         "The executable_name must be specified for $target_name")
   assert(defined(invoker.format),
          "The plist format must be specified for $target_name")
-  executable_name = invoker.executable_name
-
-  _output_name = "$target_gen_dir/$target_name.plist"
-  if (defined(invoker.output_name)) {
-    _output_name = invoker.output_name
-  }
+  assert(defined(invoker.substitutions),
+         "A list of key=value pairs must be specified for $target_name")
+  assert(defined(invoker.output_name),
+         "The name of the output file must be specified for $target_name")
 
+  _output_name = invoker.output_name
   _merged_name = get_path_info(_output_name, "dir") + "/" +
-                 get_path_info(_output_name, "name") + "_merged" +
+                 get_path_info(_output_name, "name") + "_merged." +
                  get_path_info(_output_name, "extension")
 
-  action(target_name + "_merge_templates") {
+  _merge_target = target_name + "_merge"
+
+  action(_merge_target) {
     forward_variables_from(invoker,
                            [
                              "deps",
@@ -113,7 +106,7 @@ template("info_plist") {
              "merge",
              "-f=" + invoker.format,
              "-o=" + rebase_path(_merged_name, root_build_dir),
-           ] + rebase_path(sources, root_build_dir)
+           ] + rebase_path(invoker.plist_templates, root_build_dir)
   }
 
   action(target_name) {
@@ -129,29 +122,79 @@ template("info_plist") {
     outputs = [
       _output_name,
     ]
-    args = [ "substitute" ]
-    if (defined(invoker.extra_substitutions)) {
-      foreach(substitution, invoker.extra_substitutions) {
-        args += [ "-s=$substitution" ]
-      }
-    }
-    args += [
-      "-s=BUILD_MACHINE_OS_BUILD=$machine_os_build",
-      "-s=EXECUTABLE_NAME=$executable_name",
-      "-s=GCC_VERSION=com.apple.compilers.llvm.clang.1_0",
-      "-s=PRODUCT_NAME=$executable_name",
-      "-s=XCODE_BUILD=$xcode_build",
-      "-s=XCODE_VERSION=$xcode_version",
+    args = [
+      "substitute",
+      "-f=" + invoker.format,
       "-o=" + rebase_path(_output_name, root_build_dir),
       "-t=" + rebase_path(_merged_name, root_build_dir),
-      "-f=" + invoker.format,
     ]
+    foreach(_substitution, invoker.substitutions) {
+      args += [ "-s=$_substitution" ]
+    }
     deps = [
-      ":" + target_name + "_merge_templates",
+      ":$_merge_target",
     ]
   }
 }
 
+# The base template used to generate Info.plist files for iOS and Mac apps and
+# frameworks.
+#
+# Arguments
+#
+#     plist_templates:
+#         string array, paths to plist files which will be used for the bundle.
+#
+#     executable_name:
+#         string, name of the generated target used for the product
+#         and executable name as specified in the output Info.plist.
+#
+#     format:
+#         string, the format to `plutil -convert` the plist to when
+#         generating the output.
+#
+#     extra_substitutions:
+#         (optional) string array, 'key=value' pairs for extra fields which are
+#         specified in a source Info.plist template.
+#
+#     output_name:
+#         (optional) string, name of the generated plist file, default to
+#         "$target_gen_dir/$target_name.plist".
+template("info_plist") {
+  assert(defined(invoker.executable_name),
+         "The executable_name must be specified for $target_name")
+  executable_name = invoker.executable_name
+
+  compile_plist(target_name) {
+    forward_variables_from(invoker,
+                           [
+                             "plist_templates",
+                             "testonly",
+                             "deps",
+                             "visibility",
+                             "format",
+                           ])
+
+    if (defined(invoker.output_name)) {
+      output_name = invoker.output_name
+    } else {
+      output_name = "$target_gen_dir/$target_name.plist"
+    }
+
+    substitutions = [
+      "BUILD_MACHINE_OS_BUILD=$machine_os_build",
+      "EXECUTABLE_NAME=$executable_name",
+      "GCC_VERSION=com.apple.compilers.llvm.clang.1_0",
+      "PRODUCT_NAME=$executable_name",
+      "XCODE_BUILD=$xcode_build",
+      "XCODE_VERSION=$xcode_version",
+    ]
+    if (defined(invoker.extra_substitutions)) {
+      substitutions += invoker.extra_substitutions
+    }
+  }
+}
+
 # Template to combile .xib or .storyboard files.
 #
 # Arguments