Adding a new component, Previews.

components/previews/BUILD.gn

Index: components/previews/BUILD.gn
diff --git a/components/link_header_util/BUILD.gn b/components/previews/BUILD.gn
similarity index 61%
copy from components/link_header_util/BUILD.gn
copy to components/previews/BUILD.gn
index 6faef62389c66f9acdb0307557204d8924d368c6..b5ca808c8113b8a79db5c49884c0e5914d4382ab 100644
--- a/components/link_header_util/BUILD.gn
+++ b/components/previews/BUILD.gn
@@ -1,29 +1,29 @@
 # 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.
 
-static_library("link_header_util") {
+static_library("previews") {
   sources = [
-    "link_header_util.cc",
-    "link_header_util.h",
+    "previews_experiments.cc",
+    "previews_experiments.h",
   ]
 
   deps = [
     "//base",
-    "//net",
+    "//components/variations",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
-    "link_header_util_unittest.cc",
+    "previews_experiments_unittest.cc",
   ]
 
   deps = [
-    ":link_header_util",
+    ":previews",
     "//base",
-    "//net",
+    "//components/variations",
     "//testing/gtest",
   ]
 }