Roll forward to cl/338482889

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I9850950db8bd84f0904ea1a413151887f52098cf

cpp/platform/impl/g3/system_clock.cc

@@ -0,0 +1,16 @@
+#include "platform/api/system_clock.h"
+
+#include "platform/base/exception.h"
+#include "absl/time/clock.h"
+
+namespace location {
+namespace nearby {
+
+absl::Time SystemClock::ElapsedRealtime() { return absl::Now(); }
+Exception SystemClock::Sleep(absl::Duration duration) {
+  absl::SleepFor(duration);
+  return {Exception::kSuccess};
+}
+
+}  // namespace nearby
+}  // namespace location