buffet: Extracted libweave into separate directory

It still has references to dbus, buffet and other ChromeOS specific
stuff.

BUG=brillo:1235
TEST=FEATURES=test emerge-gizmo buffet

Change-Id: Ib108960ee88afcf2ecdddf37ce30bd5f168c0034
Reviewed-on: https://chromium-review.googlesource.com/283509
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>

libweave/src/privet/wifi_ssid_generator.h

diff --git a/libweave/src/privet/wifi_ssid_generator.h b/libweave/src/privet/wifi_ssid_generator.h
new file mode 100644
index 0000000..8e7ec63
--- /dev/null
+++ b/libweave/src/privet/wifi_ssid_generator.h
@@ -0,0 +1,43 @@
+// Copyright 2014 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef LIBWEAVE_SRC_PRIVET_WIFI_SSID_GENERATOR_H_
+#define LIBWEAVE_SRC_PRIVET_WIFI_SSID_GENERATOR_H_
+
+#include <string>
+
+#include <base/callback.h>
+
+namespace privetd {
+
+class CloudDelegate;
+class WifiDelegate;
+
+class WifiSsidGenerator final {
+ public:
+  WifiSsidGenerator(const CloudDelegate* gcd, const WifiDelegate* wifi);
+  ~WifiSsidGenerator() = default;
+
+  std::string GenerateFlags() const;
+
+  // Can return empty string if CloudDelegate is not ready.
+  std::string GenerateSsid() const;
+
+ private:
+  friend class WifiSsidGeneratorTest;
+
+  // Sets object to use |n| instead of random number for SSID generation.
+  void SetRandomForTests(int n);
+
+  const CloudDelegate* gcd_{nullptr};
+  const WifiDelegate* wifi_{nullptr};
+
+  base::Callback<int(void)> get_random_;
+
+  DISALLOW_COPY_AND_ASSIGN(WifiSsidGenerator);
+};
+
+}  // namespace privetd
+
+#endif  // LIBWEAVE_SRC_PRIVET_WIFI_SSID_GENERATOR_H_