patch from chinmaygarde@ to make progress on mac, ios.

build/config/mac/rules.gni

+# Copyright 2015 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.
+
+mac_app_script = "//build/config/mac/mac_app.py"
+
+template("code_sign_mac") {
+  assert(defined(invoker.entitlements_path),
+         "The path to the entitlements .xcent file")
+  assert(defined(invoker.identity), "The code signing identity")
+  assert(defined(invoker.application_path), "The application to code sign")
+  assert(defined(invoker.deps))
+
+  action(target_name) {
+    sources = [
+      invoker.entitlements_path,
+    ]
+
+    _application_path = invoker.application_path
+
+    script = mac_app_script
+
+    outputs = [
+      "$_application_path/_CodeSignature/CodeResources",
+    ]
+
+    args = [
+      "codesign",
+      "-p",
+      rebase_path(invoker.application_path, root_build_dir),
+      "-i",
+      invoker.identity,
+      "-e",
+      rebase_path(invoker.entitlements_path, root_build_dir),
+    ]
+
+    forward_variables_from(invoker,
+                           [
+                             "deps",
+                             "public_deps",
+                             "visibility",
+                           ])
+  }
+}
+
+template("process_nibs_mac") {
+  assert(defined(invoker.sources), "The nib sources must be specified")
+  assert(defined(invoker.module), "The nib module must be specified")
+  assert(defined(invoker.output_dir), "The output directory must be specified")
+
+  action_foreach(target_name) {
+    sources = invoker.sources
+
+    script = mac_app_script
+
+    invoker_out_dir = invoker.output_dir
+
+    outputs = [
+      "$root_build_dir/$invoker_out_dir/{{source_name_part}}.nib",
+    ]
+
+    args = [
+      "nib",
+      "-i",
+      "{{source}}",
+      "-o",
+      invoker_out_dir,
+      "-m",
+      invoker.module,
+    ]
+  }
+
+  forward_variables_from(invoker,
+                         [
+                           "deps",
+                           "public_deps",
+                           "visibility",
+                         ])
+}
+
+template("resource_copy_mac") {

[brettw, 2015/08/06 18:07:27]

This file seems weirdly the same as the iOS one. Should they be the same
(potentially the template could trigger off the current platform), or can they
share some underlying shared template?

[Dirk Pranke, 2015/08/06 18:29:46]

I think they can probably be merged, but I'd like to do that in a separate
follow-up patch. Sound okay?

[brettw, 2015/08/06 19:35:10]

Yes, we can do this in a follow-up.

+  assert(defined(invoker.resources),
+         "The source list of resources to copy over")
+  assert(defined(invoker.bundle_directory),
+         "The directory within the bundle to place the sources in")
+
+  if (defined(invoker.app_name)) {
+    _app_name = invoker.app_name
+  } else {
+    _app_name = target_name
+  }
+
+  _bundle_directory = invoker.bundle_directory
+  _resources = invoker.resources
+
+  copy(target_name) {
+    set_sources_assignment_filter([])
+    sources = _resources
+    outputs = [
+      "$root_build_dir/$_app_name.app/$_bundle_directory/Contents/Resources/{{source_file_part}}",
+    ]
+  }
+}
+
+template("mac_app") {
+  assert(defined(invoker.deps),
+         "Dependencies must be specified for $target_name")
+  assert(defined(invoker.info_plist),
+         "The application plist file must be specified for $target_name")
+  assert(defined(invoker.xibs),
+         "The list of XIB files must be specified for $target_name")
+
+  group_gen_target_name = target_name
+  copy_all_target_name = target_name + "_all_copy"
+
+  # We just create a variable so we can use the same in interpolation
+  if (defined(invoker.app_name)) {
+    _app_name = invoker.app_name
+  } else {
+    _app_name = target_name
+  }
+
+  # Generate the executable
+  bin_gen_target_name = target_name + "_bin"
+  executable(bin_gen_target_name) {
+    visibility = [ ":$group_gen_target_name" ]
+    deps = invoker.deps
+    output_name = app_name
+  }
+
+  # Process the Info.plist
+  plist_gen_target_name = target_name + "_plist"
+
+  action(plist_gen_target_name) {
+    visibility = [ ":$group_gen_target_name" ]
+    script = mac_app_script
+
+    sources = [
+      invoker.info_plist,
+    ]
+    outputs = [
+      "$root_build_dir/Info.plist",
+    ]
+
+    args = [
+      "plist",
+      "-i",
+      rebase_path(invoker.info_plist, root_build_dir),
+      "-o",
+      rebase_path(root_build_dir),
+    ]
+  }
+
+  # Copy the generated binaries and assets to their appropriate locations
+  copy_plist_gen_target_name = target_name + "_plist_copy"
+  copy(copy_plist_gen_target_name) {
+    visibility = [ ":$group_gen_target_name" ]
+    sources = [
+      "$root_build_dir/Info.plist",
+    ]
+
+    outputs = [
+      "$root_build_dir/$app_name.app/Contents/{{source_file_part}}",
+    ]
+
+    deps = [
+      ":$plist_gen_target_name",
+    ]
+  }
+
+  copy_bin_target_name = target_name + "_bin_copy"
+  copy(copy_bin_target_name) {
+    visibility = [ ":$group_gen_target_name" ]
+    sources = [
+      "$root_build_dir/$app_name",
+    ]
+
+    outputs = [
+      "$root_build_dir/$app_name.app/Contents/MacOS/{{source_file_part}}",
+    ]
+
+    deps = [
+      ":$bin_gen_target_name",
+    ]
+  }
+
+  copy_xib_target_name = target_name + "_xib_copy"
+  process_nibs_mac(copy_xib_target_name) {
+    visibility = [ ":$group_gen_target_name" ]
+    sources = invoker.xibs
+    module = app_name
+    output_dir = "$app_name.app/Contents/Resources"
+  }
+
+  group(copy_all_target_name) {
+    visibility = [ ":$group_gen_target_name" ]
+    deps = [
+      ":$struct_gen_target_name",
+      ":$copy_plist_gen_target_name",
+      ":$copy_bin_target_name",
+      ":$copy_xib_target_name",
+    ]
+  }
+
+  # Top level group
+
+  group(group_gen_target_name) {
+    deps = [
+      ":$copy_all_target_name",
+    ]
+  }
+}