Adding a BUILD file for both gyp and gn for the new background_offlining

components/offline_pages/background/BUILD.gn

+# Copyright 2016 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.
+
+if (is_android) {
+  import("//build/config/android/rules.gni")
+}
+
+# GYP: //components/offline_pages/offline_pages.gypi:background_offlining

[fgorski, 2016/04/28 11:54:59]

a) gyp says background_offliner
b) I see value in having the default simply say background

[Pete Williamson, 2016/04/28 20:22:03]

Changed to background_offliner to be consistent.
While our directory is just "background", it seems insufficiently specific for a
target name.

+static_library("background_offlining") {
+  sources = [
+    "request_coordinator.cc",

[jochen (gone - plz use gerrit), 2016/04/28 15:39:06]

why are the sources of the gyp and gn target different?

[Pete Williamson, 2016/04/28 20:22:03]

Looking elsewhere, it seems that the .gypi files mention both .h files and .cc
files, but BUILD.gn files mention only .cc files.

[Pete Williamson, 2016/04/28 22:14:32]

After asking around, it looks like I picked a bad example build.gn file to look
at. Added the .h files.

+  ]
+
+  deps = [
+    "//base",
+    "//components/bookmarks/browser",

[fgorski, 2016/04/28 11:54:58]

not needed I think

[Pete Williamson, 2016/04/28 20:22:03]

Done.

+    "//components/offline_pages:offline_pages",
+    "//net",
+    "//url",
+  ]
+}