Add GN build files for apple_sample_code and molokocacao targets.

This can be tested with the following command lines in a Mac computer:

$ gn gen out-gn
$ ninja -C out-gn apple_sample_code molokocacao

BUG=None
TEST=see above
R=avi@chromium.org,mark@chromium.org

Review URL: https://codereview.chromium.org/946963002

Cr-Commit-Position: refs/heads/master@{#317650}

BUILD.gn

@@ -271,6 +271,11 @@ group("root") {
   #
 
   if (is_mac) {
+    deps += [
+      "//third_party/apple_sample_code",
+      "//third_party/molokocacao",
+    ]
+
     # TODO(dpranke): These are as-yet untriaged but need at least the above.
     deps -= [
       "//apps",

third_party/apple_sample_code/BUILD.gn

+# 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.
+
+source_set("apple_sample_code") {
+  sources = [
+    "ImageAndTextCell.h",
+    "ImageAndTextCell.m",
+  ]
+
+  libs = [ "AppKit.framework" ]
+}

third_party/molokocacao/BUILD.gn

+# 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.
+
+source_set("molokocacao") {
+  sources = [
+    "NSBezierPath+MCAdditions.h",
+    "NSBezierPath+MCAdditions.m",
+  ]
+
+  deps = [
+    "//third_party/google_toolbox_for_mac",
+  ]
+
+  libs = [ "AppKit.framework" ]
+}