Add the BUILD files for content_resources.

- Add GN build file (BUILD.gn) for content_resources target
(//content/app/resources).
- Add GRD file for grit (content_resources.grd).
- Add GYP file (content_resources.gyp) to generate the grit header file
from content_resources.grd

Not hooked up yet, this will come in the next CL.

BUG=338338
TEST=None
R=avi@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/475223004

Cr-Commit-Position: refs/heads/master@{#290150}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290150 0039d316-1c4b-4281-b951-d872f2087c98

content/app/resources/BUILD.gn

+# 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("//tools/grit/grit_rule.gni")
+
+grit("resources") {
+  source = "content_resources.grd"
+  outputs = [
+    "grit/content_resources.h",
+    "content_resources_100_percent.pak",
+    "content_resources_200_percent.pak",
+  ]
+}

content/app/resources/content_resources.gyp

+# 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.
+
+{
+  'targets': [
+    {
+      # GN version: //content/app/resources
+      'target_name': 'content_resources',
+      'type': 'none',
+      'variables': {
+        'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/content/app/resources/',
+      },
+      'actions': [
+        {
+          'action_name': 'generate_content_resources',
+          'variables': {
+            'grit_grd_file': 'content_resources.grd',
+          },
+          'includes': [ '../../../build/grit_action.gypi' ],
+        },
+      ],
+      'includes': [ '../../../build/grit_target.gypi' ],
+    },
+  ]
+}