Add Platform Independent Eddystone Encoder

components/physical_web/eddystone/BUILD.gn

+# Copyright 2017 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("eddystone") {
+  sources = [
+    "eddystone_encoder.cc",
+    "eddystone_encoder.h",
+  ]
+
+  public_deps = [
+    "//base",

[mattreynolds, 2017/03/08 19:14:46]

//base might not be required, can you try building without it?

[iankc, 2017/03/09 20:45:44]

Done.

+    "//url",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "eddystone_encoder_unittest.cc",
+  ]
+
+  deps = [
+    ":eddystone",
+    "//base",
+    "//testing/gtest",
+    "//url",
+  ]
+}