Roll forward to cl/338482889

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: Ic2bdb234e89f3c5860d1b483dd4bce689f13d057

cpp/platform/base/prng.h

@@ -0,0 +1,37 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef PLATFORM_BASE_PRNG_H_
+#define PLATFORM_BASE_PRNG_H_
+
+#include <cstdint>
+
+namespace location {
+namespace nearby {
+
+// A (non-cryptographic) pseudo-random number generator.
+class Prng {
+ public:
+  Prng();
+  ~Prng();
+
+  std::int32_t NextInt32();
+  std::uint32_t NextUint32();
+  std::int64_t NextInt64();
+};
+
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_BASE_PRNG_H_